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CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A leaving behind a billow of steam as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tony Gray and Kevin O'Connell KSC-2011-5421

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A leaving behind a billow of steam as it lifts off on its... More

CAPE CANAVERAL, Fla. -- Dressed in their bright-orange launch-and-entry suits, the final four astronauts to launch aboard a space shuttle exit the Astronaut Crew Quarters in the Operations and Checkout Building at NASA's Kennedy Space Center in Florida. STS-135 Commander Chris Ferguson is followed by Pilot Doug Hurley and Mission Specialists Rex Walheim and Sandy Magnus. The astronauts, who will head to Launch Pad 39A aboard the silver Astrovan, are scheduled to lift off aboard space shuttle Atlantis at 11:26 a.m. EDT on July 8 for their mission to the International Space Station. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the orbiting outpost. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-5204

CAPE CANAVERAL, Fla. -- Dressed in their bright-orange launch-and-entr...

CAPE CANAVERAL, Fla. -- Dressed in their bright-orange launch-and-entry suits, the final four astronauts to launch aboard a space shuttle exit the Astronaut Crew Quarters in the Operations and Checkout Building... More

CAPE CANAVERAL, Fla. -- NASA photographer Sandra Joseph aims her remote camera tracker on space shuttle Atlantis at it lifts off from Launch Pad 39A at NASA's Kennedy Space Center in Florida beginning its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Sandra Joseph KSC-2011-5380

CAPE CANAVERAL, Fla. -- NASA photographer Sandra Joseph aims her remot...

CAPE CANAVERAL, Fla. -- NASA photographer Sandra Joseph aims her remote camera tracker on space shuttle Atlantis at it lifts off from Launch Pad 39A at NASA's Kennedy Space Center in Florida beginning its STS-1... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis soars from Launch Pad 39A at NASA's Kennedy Space Center in Florida on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/ Kenny Allen KSC-2011-5454

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis soars from Launch Pad 3...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis soars from Launch Pad 39A at NASA's Kennedy Space Center in Florida on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Comm... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A leaving behind a billow of steam as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tony Gray and Kevin O'Connell KSC-2011-5422

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A leaving behind a billow of steam as it lifts off on its... More

CAPE CANAVERAL, Fla. -- Taken from the Vehicle Assembly Building roof at NASA's Kennedy Space Center in Florida, this image shows the Press Site complex with a myriad of vehicles, satellite trucks and trailers belonging to invited guests and media for the launch of space shuttle Atlantis. Atlantis began its final flight, the STS-135 mission, to the International Space Station at 11:29 a.m. EDT on July 8. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Jeffrey Marino KSC-2011-5267

CAPE CANAVERAL, Fla. -- Taken from the Vehicle Assembly Building roof ...

CAPE CANAVERAL, Fla. -- Taken from the Vehicle Assembly Building roof at NASA's Kennedy Space Center in Florida, this image shows the Press Site complex with a myriad of vehicles, satellite trucks and trailers ... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers monitor the progress of the rotating service structure (RSS) as it rolls away from space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5131

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers monitor the progress of the rotating service structure (RSS) as it rolls away from space... More

CAPE CANAVERAL, Fla. -- Dressed in their bright-orange launch-and-entry suits, the final four astronauts to launch aboard a space shuttle exit the Astronaut Crew Quarters in the Operations and Checkout Building at NASA's Kennedy Space Center in Florida. In the left row, STS-135 Pilot Doug Hurley is followed by Mission Specialist Sandy Magnus. In the right row, Commander Chris Ferguson is followed by Mission Specialist Rex Walheim. The astronauts, who will head to Launch Pad 39A aboard the silver Astrovan, are scheduled to lift off aboard space shuttle Atlantis at 11:26 a.m. EDT on July 8 for their mission to the International Space Station. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the orbiting outpost. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-5202

CAPE CANAVERAL, Fla. -- Dressed in their bright-orange launch-and-entr...

CAPE CANAVERAL, Fla. -- Dressed in their bright-orange launch-and-entry suits, the final four astronauts to launch aboard a space shuttle exit the Astronaut Crew Quarters in the Operations and Checkout Building... More

CAPE CANAVERAL, Fla. -- In Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida, launch team members monitor the countdown to the launch of space shuttle Atlantis on its STS-135 mission to the International Space Station. Above the space shuttle countdown clock are five orbiter tributes on display. The tributes feature major accomplishments and significant achievements made by each shuttle, as well as mission patches and processing milestones. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-5278

CAPE CANAVERAL, Fla. -- In Firing Room 4 of the Launch Control Center ...

CAPE CANAVERAL, Fla. -- In Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida, launch team members monitor the countdown to the launch of space shuttle Atlantis on its STS-135 ... More

CAPE CANAVERAL, Fla. -- Liberty Star, one of NASA's solid rocket booster retrieval ships, tows a spent booster from space shuttle Atlantis' final launch, to Port Canaveral in Florida. The shuttle's two solid rocket booster casings and associated flight hardware are recovered in the Atlantic Ocean after every launch by Freedom Star and Liberty Star. The boosters impact the Atlantic about seven minutes after liftoff and the retrieval ships are stationed about 10 miles from the impact area at the time of splashdown. After the spent segments are processed, they will be transported to Utah, where they will be deserviced and stored, if needed. Atlantis began its final flight at 11:29 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also delivers the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit to the station. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-5368

CAPE CANAVERAL, Fla. -- Liberty Star, one of NASA's solid rocket boost...

CAPE CANAVERAL, Fla. -- Liberty Star, one of NASA's solid rocket booster retrieval ships, tows a spent booster from space shuttle Atlantis' final launch, to Port Canaveral in Florida. The shuttle's two solid r... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A producing billows of smoke and steam as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tony Gray and Tom Farrar KSC-2011-5411

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A producing billows of smoke and steam as it lifts off on... More

CAPE CANAVERAL, Fla. -- At Launch Pad 39A at NASA's Kennedy Space Center in Florida space shuttle Atlantis is reflected in a pond near the pad after the retraction of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5182

CAPE CANAVERAL, Fla. -- At Launch Pad 39A at NASA's Kennedy Space Cent...

CAPE CANAVERAL, Fla. -- At Launch Pad 39A at NASA's Kennedy Space Center in Florida space shuttle Atlantis is reflected in a pond near the pad after the retraction of the rotating service structure (RSS). The s... More

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson dons his launch-and-entry suit and helmet in the Operations and Checkout Building at NASA's Kennedy Space Center in Florida. Ferguson is one of the final four astronauts to launch aboard a space shuttle. He is a retired U.S. Navy captain who already has logged nearly a month in space during two previous shuttle flights. STS-135 is scheduled to lift off aboard space shuttle Atlantis at 11:26 a.m. EDT on July 8 for a mission to the International Space Station. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the orbiting outpost. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-5195

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson dons his laun...

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson dons his launch-and-entry suit and helmet in the Operations and Checkout Building at NASA's Kennedy Space Center in Florida. Ferguson is one of the final... More

CAPE CANAVERAL, Fla. -- Liberty Star, one of NASA's solid rocket booster retrieval ships, tows the right spent booster from space shuttle Atlantis' final launch, as it is taken to Port Canaveral in Florida. The shuttle's two solid rocket booster casings and associated flight hardware are recovered in the Atlantic Ocean after every launch by Freedom Star and Liberty Star. The boosters impact the Atlantic about seven minutes after liftoff and the retrieval ships are stationed about 10 miles from the impact area at the time of splashdown. After the spent segments are processed, they will be transported to Utah, where they will be deserviced and stored, if needed. Atlantis began its final flight at 11:29 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also delivers the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit to the station. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-5519

CAPE CANAVERAL, Fla. -- Liberty Star, one of NASA's solid rocket boost...

CAPE CANAVERAL, Fla. -- Liberty Star, one of NASA's solid rocket booster retrieval ships, tows the right spent booster from space shuttle Atlantis' final launch, as it is taken to Port Canaveral in Florida. The... More

CAPE CANAVERAL, Fla. -- In Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida, launch team members monitor the countdown to the launch of space shuttle Atlantis on its STS-135 mission to the International Space Station. Seen here is NASA Test Director Steve Payne. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-5292

CAPE CANAVERAL, Fla. -- In Firing Room 4 of the Launch Control Center ...

CAPE CANAVERAL, Fla. -- In Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida, launch team members monitor the countdown to the launch of space shuttle Atlantis on its STS-135 ... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5122

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. T... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A producing billows of smoke and steam as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Sandra Joseph and Kevin O'Connell KSC-2011-5351

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A producing billows of smoke and steam as it lifts off on... More

CAPE CANAVERAL, Fla. -- Employees check out space shuttle Atlantis after it was uncovered on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5147

CAPE CANAVERAL, Fla. -- Employees check out space shuttle Atlantis aft...

CAPE CANAVERAL, Fla. -- Employees check out space shuttle Atlantis after it was uncovered on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). ... More

CAPE CANAVERAL, Fla. -- High above the skies at NASA's Kennedy Space Center in Florida a Coast Guard helicopter keeps watch on and around the Atlantic Ocean including space shuttle Atlantis on its seaside launch pad awaiting liftoff on its STS-135 mission. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Ken Thornsley KSC-2011-5443

CAPE CANAVERAL, Fla. -- High above the skies at NASA's Kennedy Space C...

CAPE CANAVERAL, Fla. -- High above the skies at NASA's Kennedy Space Center in Florida a Coast Guard helicopter keeps watch on and around the Atlantic Ocean including space shuttle Atlantis on its seaside launc... More

CAPE CANAVERAL, Fla. -- On Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Atlantis travels upward on streams of flame as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tony Gray and Tom Farrar KSC-2011-5414

CAPE CANAVERAL, Fla. -- On Launch Pad 39A at NASA's Kennedy Space Cent...

CAPE CANAVERAL, Fla. -- On Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Atlantis travels upward on streams of flame as it lifts off on its STS-135 mission to the International Space S... More

CREW TRAINING - STS-41G (1-G TRAINER) - JSC

CREW TRAINING - STS-41G (1-G TRAINER) - JSC

Views of STS-41G Crew member Paul Sculley-Powers during mission experiment training, Fixed Base Simulator, Bldg. 5, 09/09/1984. 1. SHUTTLE - SIMUALTOR (1-G) JSC, HOUSTON, TX

CAPE CANAVERAL, Fla. -- Near Launch Pad 39A at Kennedy Space Center in Florida, a Golden-Silk Spider repairs its web after a capturing a moth. The golden-silk spider repairs the webbing each day, replacing half but never the whole web at one time. Its web may measure two to three feet across. The center shares a boundary with the Merritt Island Wildlife Nature Refuge, consisting of 140,000 acres. The Refuge provides a wide variety of habitats: coastal dunes, saltwater estuaries and marshes, freshwater impoundments, scrub, pine flatwoods, and hardwood hammocks that provide habitat for more than 1,500 species of plants and animals. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Ken Thornsley KSC-2011-5446

CAPE CANAVERAL, Fla. -- Near Launch Pad 39A at Kennedy Space Center in...

CAPE CANAVERAL, Fla. -- Near Launch Pad 39A at Kennedy Space Center in Florida, a Golden-Silk Spider repairs its web after a capturing a moth. The golden-silk spider repairs the webbing each day, replacing half... More

CAPE CANAVERAL, Fla. -- Near Launch Pad 39A at Kennedy Space Center in Florida, a Golden-Silk Spider repairs its web after a capturing a moth. The golden-silk spider repairs the webbing each day, replacing half but never the whole web at one time. Its web may measure two to three feet across. The center shares a boundary with the Merritt Island Wildlife Nature Refuge, consisting of 140,000 acres. The Refuge provides a wide variety of habitats: coastal dunes, saltwater estuaries and marshes, freshwater impoundments, scrub, pine flatwoods, and hardwood hammocks that provide habitat for more than 1,500 species of plants and animals. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Ken Thornsley KSC-2011-5444

CAPE CANAVERAL, Fla. -- Near Launch Pad 39A at Kennedy Space Center in...

CAPE CANAVERAL, Fla. -- Near Launch Pad 39A at Kennedy Space Center in Florida, a Golden-Silk Spider repairs its web after a capturing a moth. The golden-silk spider repairs the webbing each day, replacing half... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5433

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure (RSS) slowly rolls away revealing space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5138

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure (RSS) slowly rolls away revealing space shuttle Atlantis. The RSS... More

CAPE CANAVERAL, Fla. – Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5429

CAPE CANAVERAL, Fla. – Space shuttle Atlantis is revealed on Launch Pa...

CAPE CANAVERAL, Fla. – Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather p... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5157

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. Here, NASA astronaut Doug Wheelock talks with Sesame Street's Elmo. Sesame Street also is at Kennedy to film Elmo, as he learns about space exploration at NASA. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5094

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frankie Martin KSC-2011-5079

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Pres...

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its ST... More

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frankie Martin KSC-2011-5081

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Pres...

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its ST... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure (RSS) slowly rolls away from space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5133

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure (RSS) slowly rolls away from space shuttle Atlantis. The RSS prov... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5126

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. T... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5151

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. The tower at left is used for safely burning off any excess hydrogen while the shuttle is on the pad prior to launch. To the right of the pad is the 300,000-gallon water tower that provides the water used for sound suppression on the pad during liftoff. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5170

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The stru... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. Here, NASA astronaut Mike Massimino talks with Sesame Street's Elmo. Sesame Street also is at Kennedy to film Elmo, as he learns about space exploration at NASA. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5098

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frankie Martin KSC-2011-5082

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Pres...

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its ST... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5124

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. T... More

CAPE CANAVERAL, Fla. -- Flags wave briskly at Launch Pad 39A at NASA's Kennedy Space Center in Florida as space shuttle Atlantis is revealed following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5166

CAPE CANAVERAL, Fla. -- Flags wave briskly at Launch Pad 39A at NASA's...

CAPE CANAVERAL, Fla. -- Flags wave briskly at Launch Pad 39A at NASA's Kennedy Space Center in Florida as space shuttle Atlantis is revealed following the move of the rotating service structure (RSS). The struc... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. To the right of the pad is the 300,000-gallon water tower that provides the water used for sound suppression on the pad during liftoff. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5173

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The stru... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5178

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. – Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5428

CAPE CANAVERAL, Fla. – Space shuttle Atlantis is revealed on Launch Pa...

CAPE CANAVERAL, Fla. – Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather p... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5145

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5174

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5159

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. The tower at left is used for safely burning off any excess hydrogen while the shuttle is on the pad prior to launch. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5171

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The stru... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. In front of the pad a banner proclaims the sentiments of Kennedy's work force. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5164

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Flags wave briskly at Launch Pad 39A at NASA's Kennedy Space Center in Florida as space shuttle Atlantis is revealed following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5165

CAPE CANAVERAL, Fla. -- Flags wave briskly at Launch Pad 39A at NASA's...

CAPE CANAVERAL, Fla. -- Flags wave briskly at Launch Pad 39A at NASA's Kennedy Space Center in Florida as space shuttle Atlantis is revealed following the move of the rotating service structure (RSS). The struc... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5175

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5432

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- A worker in the control booth on Launch Pad 39A at NASA's Kennedy Space Center in Florida monitors the progress of the rotating service structure (RSS) as it is rolled back revealing space shuttle Atlantis. The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5139

CAPE CANAVERAL, Fla. -- A worker in the control booth on Launch Pad 39...

CAPE CANAVERAL, Fla. -- A worker in the control booth on Launch Pad 39A at NASA's Kennedy Space Center in Florida monitors the progress of the rotating service structure (RSS) as it is rolled back revealing spa... More

CAPE CANAVERAL, Fla.-- The Vehicle Assembly Building at NASA's Kennedy Space Center in Florida stands on the horizon as rain clouds move over the space center soon after space shuttle Atlantis is revealed on Launch Pad 39A following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5434

CAPE CANAVERAL, Fla.-- The Vehicle Assembly Building at NASA's Kennedy...

CAPE CANAVERAL, Fla.-- The Vehicle Assembly Building at NASA's Kennedy Space Center in Florida stands on the horizon as rain clouds move over the space center soon after space shuttle Atlantis is revealed on La... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure (RSS) slowly rolls away revealing space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5140

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure (RSS) slowly rolls away revealing space shuttle Atlantis. The RSS... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. The tower at left is used for safely burning off any excess hydrogen while the shuttle is on the pad prior to launch. To the right of the pad is the 300,000-gallon water tower that provides the water used for sound suppression on the pad during liftoff. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5172

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The stru... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center, space shuttle Atlantis can be seen in the distance awaiting liftoff on its STS-135 mission while members of the media set up cameras to capture the launch on a very rainy day in Florida. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Ken Thornsley KSC-2011-5441

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center, space shuttle ...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center, space shuttle Atlantis can be seen in the distance awaiting liftoff on its STS-135 mission while members of the media set up cameras to capture the launch... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. Here, NASA astronaut Mike Massimino talks with Sesame Street's Elmo. Sesame Street also is at Kennedy to film Elmo, as he learns about space exploration at NASA. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5093

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. Here, NASA astronaut Mike Massimino talks with Sesame Street's Elmo. Sesame Street also is at Kennedy to film Elmo, as he learns about space exploration at NASA. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5100

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5438

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. A NASA security guard takes a moment to look at Atlantis on its seaside launch pad before its final flight. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Ken Thornsley KSC-2011-5442

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The stru... More

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frankie Martin KSC-2011-5080

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Pres...

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its ST... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. This Tweetup is an opportunity to learn more about NASA, explore NASA's Kennedy Space Center in Florida and experience a space shuttle launch. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5087

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. The tower at left is used for safely burning off any excess hydrogen while the shuttle is on the pad prior to launch. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5169

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida bathed in xenon lights following the move of the rotating service structure (RSS). The stru... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5161

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. – Photographers Stan Hernda of AFP News, left, and Scott Andrews of Canon record space shuttle Atlantis as it is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5426

CAPE CANAVERAL, Fla. – Photographers Stan Hernda of AFP News, left, an...

CAPE CANAVERAL, Fla. – Photographers Stan Hernda of AFP News, left, and Scott Andrews of Canon record space shuttle Atlantis as it is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida followi... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center, space shuttle Atlantis can be seen in the distance awaiting liftoff on its STS-135 mission while members of the media set up cameras to capture the launch on a very rainy day in Florida. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Ken Thornsley KSC-2011-5440

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center, space shuttle ...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center, space shuttle Atlantis can be seen in the distance awaiting liftoff on its STS-135 mission while members of the media set up cameras to capture the launch... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. Here, NASA astronauts Mike Massimino and Doug Wheelock talk with Sesame Street's Elmo. Sesame Street also is at Kennedy to film Elmo, as he learns about space exploration at NASA. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5090

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA managers brief media about the payload and launch status of space shuttle Atlantis' STS-135 mission to the International Space Station. Seen here are NASA Test Director Jeff Spaulding (left), Payload Mission Manager Joe Delai and Shuttle Weather Officer Kathy Winters. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frankie Martin KSC-2011-5102

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy...

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA managers brief media about the payload and launch status of space shuttle Atlantis' STS-135 mission to the In... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5163

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. This Tweetup is an opportunity to learn more about NASA, explore NASA's Kennedy Space Center in Florida and experience a space shuttle launch. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5084

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5183

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- A worker in the control booth on Launch Pad 39A at NASA's Kennedy Space Center in Florida monitors the progress of the rotating service structure (RSS) as it is rolled back revealing space shuttle Atlantis. The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5135

CAPE CANAVERAL, Fla. -- A worker in the control booth on Launch Pad 39...

CAPE CANAVERAL, Fla. -- A worker in the control booth on Launch Pad 39A at NASA's Kennedy Space Center in Florida monitors the progress of the rotating service structure (RSS) as it is rolled back revealing spa... More

CAPE CANAVERAL, Fla. -- Workers check out space shuttle Atlantis after it was uncovered on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5146

CAPE CANAVERAL, Fla. -- Workers check out space shuttle Atlantis after...

CAPE CANAVERAL, Fla. -- Workers check out space shuttle Atlantis after it was uncovered on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). Th... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. Here, NASA astronauts Mike Massimino (left) and Doug Wheelock introduce a special guest to the Tweetup. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5088

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frankie Martin KSC-2011-5083

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Pres...

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the Press Site bull pen at NASA's Kennedy Space Center in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its ST... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5127

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. T... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5154

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. This Tweetup is an opportunity to learn more about NASA, explore NASA's Kennedy Space Center in Florida and experience a space shuttle launch. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5086

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. Here, Sesame Street's Elmo listens to NASA astronaut Mike Massimino (out of frame), as he learns about space exploration at NASA. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5097

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- At Launch Pad 39A at NASA's Kennedy Space Center in Florida space shuttle Atlantis is reflected in a pond near the pad after the retraction of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS retract marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim will lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: Jim Grossmann KSC-2011-5181

CAPE CANAVERAL, Fla. -- At Launch Pad 39A at NASA's Kennedy Space Cent...

CAPE CANAVERAL, Fla. -- At Launch Pad 39A at NASA's Kennedy Space Center in Florida space shuttle Atlantis is reflected in a pond near the pad after the retraction of the rotating service structure (RSS). The s... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5150

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. The RSS provides weather protection and access to the shuttle while it awaits liftoff. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5123

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A...

CAPE CANAVERAL, Fla. -- On a cloudy and overcast day on Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers prepare to roll the rotating service structure (RSS) away from space shuttle Atlantis. T... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5149

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather protection and access to the shuttle while it awaits liftoff on the pad. RSS "rollback" marks a major milestone in Atlantis' STS-135 mission countdown. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Ken Thornsley KSC-2011-5431

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch P...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center in Florida following the move of the rotating service structure (RSS). The structure provides weather ... More

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more than 5,500 online registrants. A Tweetup is an informal meeting of people who use the social messaging medium Twitter. This Tweetup is an opportunity to learn more about NASA, explore NASA's Kennedy Space Center in Florida and experience a space shuttle launch. Here, NASA Public Affairs Officer John Yembrick addresses the participants. Atlantis and its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Troy Cryder KSC-2011-5085

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is ho...

CAPE CANAVERAL, Fla. -- At Kennedy Space Center in Florida, NASA is hosting a Tweetup for 150 Twitter followers of space shuttle Atlantis' STS-135 mission to the International Space Station, selected from more ... More

CAPE CANAVERAL, Fla. -- Seen from the roof of the Vehicle Assembly Building, space shuttle Atlantis thunders off Launch Pad 39A at NASA's Kennedy Space Center in Florida. Atlantis began its final flight, the STS-135 mission to the International Space Station, at 11:29 a.m. EDT on July 8. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Jeffrey Marino KSC-2011-5276

CAPE CANAVERAL, Fla. -- Seen from the roof of the Vehicle Assembly Bui...

CAPE CANAVERAL, Fla. -- Seen from the roof of the Vehicle Assembly Building, space shuttle Atlantis thunders off Launch Pad 39A at NASA's Kennedy Space Center in Florida. Atlantis began its final flight, the ST... More

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at NASA's Kennedy Space Center in Florida, Kennedy Center Director Bob Cabana speaks to media and spectators before the launch of space shuttle Atlantis on its STS-135 mission to the International Space Station. Seen also are Stennis Space Center Director Patrick Scheuermann (left), Marshall Space Flight Center Director Robert Lightfoot and Johnson Space Center Director Mike Coats. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Chad Baumer KSC-2011-5460

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at ...

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at NASA's Kennedy Space Center in Florida, Kennedy Center Director Bob Cabana speaks to media and spectators before the launch of space shuttle... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines ignite and solid rocket boosters ignite on Launch Pad 39A leaving behind a twin stream of flame as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Rusty Backer and Mike Gayle KSC-2011-5362

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines ignite and solid rocket boosters ignite on Launch Pad 39A leaving behind a twin stream of flame as it lift... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines ignite on Launch Pad 39A producing billows of steam and smoke as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Sandra Joseph and Kevin O'Connell KSC-2011-5373

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines ignite on Launch Pad 39A producing billows of steam and smoke as it lifts off on its STS-135 mission to th... More

CAPE CANAVERAL, Fla. -- The Closeout Crew helps STS-135 Pilot Doug Hurley prepare to enter space shuttle Atlantis from the White Room of Launch Pad 39A at NASA's Kennedy Space Center in Florida. Hurley is one of the final four astronauts to launch aboard a space shuttle. He is a colonel in the U.S. Marine Corps with one shuttle mission under his belt -- STS-127 aboard Endeavour. STS-135 is scheduled to lift off at 11:26 a.m. EDT on July 8 for a mission to the International Space Station. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Sandra Joseph and Kevin O'Connell KSC-2011-5227

CAPE CANAVERAL, Fla. -- The Closeout Crew helps STS-135 Pilot Doug Hur...

CAPE CANAVERAL, Fla. -- The Closeout Crew helps STS-135 Pilot Doug Hurley prepare to enter space shuttle Atlantis from the White Room of Launch Pad 39A at NASA's Kennedy Space Center in Florida. Hurley is one o... More

CAPE CANAVERAL, Fla. -- Media from around the globe gather on the grounds of the Press Site at NASA's Kennedy Space Center in Florida to photograph and cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Seen towering above is the massive Vehicle Assembly Building. Dozens of satellite news vehicles and trailers can be seen in the parking lot. In the background is the Turn Basin where NASA's Pegasus barge delivered the final external tank for the mission. Atlantis began its final flight, with Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim on board, at 11:29 a.m. EDT July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Also in Atlantis' payload bay is the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Jim Grossmann KSC-2011-5246

CAPE CANAVERAL, Fla. -- Media from around the globe gather on the grou...

CAPE CANAVERAL, Fla. -- Media from around the globe gather on the grounds of the Press Site at NASA's Kennedy Space Center in Florida to photograph and cover the prelaunch activities and lift off of space shutt... More

CAPE CANAVERAL, Fla. -- Smoke and steam billow outward as space shuttle Atlantis' main engines are ignited for liftoff at Launch Pad 39A at NASA's Kennedy Space Center in Florida as it begins its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tony Gray and Tom Farrar KSC-2011-5418

CAPE CANAVERAL, Fla. -- Smoke and steam billow outward as space shuttl...

CAPE CANAVERAL, Fla. -- Smoke and steam billow outward as space shuttle Atlantis' main engines are ignited for liftoff at Launch Pad 39A at NASA's Kennedy Space Center in Florida as it begins its STS-135 missio... More

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis' main engines are ignited for liftoff at Launch Pad 39A at NASA's Kennedy Space Center in Florida as it begins its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tony Gray and Tom Farrar KSC-2011-5415

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis' main engines are ignit...

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis' main engines are ignited for liftoff at Launch Pad 39A at NASA's Kennedy Space Center in Florida as it begins its STS-135 mission to the International Space Stati... More

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A as it lifts off on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Sandra Joseph and Kevin O'Connell KSC-2011-5375

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, spa...

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Atlantis' main engines and solid rocket boosters ignite on Launch Pad 39A as it lifts off on its STS-135 mission to the Internati... More

CAPE CANAVERAL, Fla. -- After 30 years and 135 missions, residents and visitors to Florida's Space Coast see this rocket's red glare for the last time as space shuttle Atlantis soars toward space after lifting off Launch Pad 39A at NASA's Kennedy Space Center in Florida at 11:29 a.m. EDT on July 8. On board are four experienced astronauts -- STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also is flying the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frank Michaux KSC-2011-5331

CAPE CANAVERAL, Fla. -- After 30 years and 135 missions, residents and...

CAPE CANAVERAL, Fla. -- After 30 years and 135 missions, residents and visitors to Florida's Space Coast see this rocket's red glare for the last time as space shuttle Atlantis soars toward space after lifting ... More

CAPE CANAVERAL, Fla. -- The engines roar to life beneath space shuttle Atlantis heralding liftoff from Launch Pad 39A at NASA's Kennedy Space Center in Florida. Atlantis began its final flight, the STS-135 mission to the International Space Station, at 11:29 a.m. EDT July 8. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the orbiting laboratory. Atlantis also is flying the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, a failed ammonia pump module will be returned to Earth aboard Atlantis to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tony Gray and Tom Farrar KSC-2011-5349

CAPE CANAVERAL, Fla. -- The engines roar to life beneath space shuttle...

CAPE CANAVERAL, Fla. -- The engines roar to life beneath space shuttle Atlantis heralding liftoff from Launch Pad 39A at NASA's Kennedy Space Center in Florida. Atlantis began its final flight, the STS-135 mis... More

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at NASA's Kennedy Space Center in Florida, spectators smile with delight as they watch space shuttle Atlantis soar into space on its STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Chad Baumer KSC-2011-5473

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at ...

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at NASA's Kennedy Space Center in Florida, spectators smile with delight as they watch space shuttle Atlantis soar into space on its STS-135 mi... More

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at NASA's Kennedy Space Center in Florida, NASA astronaut Doug Wheelock speaks with a spectator before the upcoming launch of space shuttle Atlantis' STS-135 mission to the International Space Station. Atlantis with its crew of four; Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim, lifted off at 11:29 a.m. EDT on July 8, 2011 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Chad Baumer KSC-2011-5466

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at ...

CAPE CANAVERAL, Fla. -- At the Banana River Creek VIP viewing area at NASA's Kennedy Space Center in Florida, NASA astronaut Doug Wheelock speaks with a spectator before the upcoming launch of space shuttle Atl... More

CAPE CANAVERAL, Fla. -- After 30 years and 135 missions, residents and visitors to Florida's Space Coast flock to a viewing site along U.S. 1 in Titusville to see the rocket's red glare of NASA's Space Shuttle Program soar for the last time. Space shuttle Atlantis is scheduled to liftoff at 11:26 a.m. EDT from Launch Pad 39A at NASA's Kennedy Space Center in Florida. On board will be four experienced astronauts -- STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frank Michaux KSC-2011-5316

CAPE CANAVERAL, Fla. -- After 30 years and 135 missions, residents and...

CAPE CANAVERAL, Fla. -- After 30 years and 135 missions, residents and visitors to Florida's Space Coast flock to a viewing site along U.S. 1 in Titusville to see the rocket's red glare of NASA's Space Shuttle ... More

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the NASA News Center at NASA Kennedy Space Center's Press Site in Florida to photograph and cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Satellite news trucks, trailers and automobiles can be seen in the parking lot with the massive Vehicle Assembly Building towering above. Atlantis began its final flight, with Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim on board, at 11:29 a.m. EDT July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Also in Atlantis' payload bay is the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Jim Grossmann KSC-2011-5256

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the NASA...

CAPE CANAVERAL, Fla. -- Media from around the globe gather at the NASA News Center at NASA Kennedy Space Center's Press Site in Florida to photograph and cover the prelaunch activities and lift off of space shu... More

CAPE CANAVERAL, Fla. -- Media and Tweetup participants from around the globe gather at the NASA News Center at NASA Kennedy Space Center's Press Site in Florida to cover the prelaunch activities and lift off of space shuttle Atlantis on its STS-135 mission to the International Space Station. Atlantis began its final flight, with Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim on board, at 11:29 a.m. EDT July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the station. Also in Atlantis' payload bay is the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 is the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Jim Grossmann KSC-2011-5249

CAPE CANAVERAL, Fla. -- Media and Tweetup participants from around the...

CAPE CANAVERAL, Fla. -- Media and Tweetup participants from around the globe gather at the NASA News Center at NASA Kennedy Space Center's Press Site in Florida to cover the prelaunch activities and lift off of... More

CAPE CANAVERAL, Fla. -- A NASA helicopter circles space shuttle Atlantis on Launch Pad 39A prior to launch on the STS-135 mission. To the right of the shuttle, the fixed service structure which is normally closed around the shuttle now is open for liftoff. At left of the pad is the 300,000-gallon water tower that provides the water used for sound suppression on the pad during liftoff. Atlantis and its crew of four -- Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim -- are scheduled to lift off at 11:26 a.m. EDT on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Frank Michaux KSC-2011-5208

CAPE CANAVERAL, Fla. -- A NASA helicopter circles space shuttle Atlant...

CAPE CANAVERAL, Fla. -- A NASA helicopter circles space shuttle Atlantis on Launch Pad 39A prior to launch on the STS-135 mission. To the right of the shuttle, the fixed service structure which is normally clos... More

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