KENNEDY SPACE CENTER, Fla. -- Floodlights reveal the Space Shuttle Discovery after rollback of the Rotating Service Structure in preparation for launch on mission STS-105. Above the external tank, the “beanie cap” is poised, waiting for loading of the propellants. The cap, or vent hood, is on the end of the gaseous oxygen vent arm that allows gaseous oxygen vapors to vent away from the Space Shuttle. On the mission, Discovery will be transporting the Expedition Three crew and several payloads and scientific experiments to the ISS, including the Early Ammonia Servicer (EAS) tank. The EAS, which will support the thermal control subsystems until a permanent system is activated, will be attached to the Station during two spacewalks. The three-member Expedition Two crew will be returning to Earth aboard Discovery after a five-month stay on the Station. Launch is scheduled for 5:38 p.m. EDT Aug. 9 KSC01padig260

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KENNEDY SPACE CENTER, FLA. -- Amid the glow of lights from the fixed and rotating service structures, Space Shuttle Discovery rests on the hardstand of Launch Pad 39B at NASA's Kennedy Space Center after completing the 4.2-mile journey from the Vehicle Assembly Building. First motion was at 12:45 p.m. EDT. The shuttle rests on a mobile launcher platform. The rollout is an important step before launch of Discovery on mission STS-121 to the International Space Station. First motion of the shuttle leaving NASA's Vehicle Assembly Building was at 12:45 p.m. EDT. Discovery's launch is targeted for July 1 in a launch window that extends to July 19. During the 12-day mission, Discovery's crew will test new hardware and techniques to improve shuttle safety, as well as deliver supplies and make repairs to the station. Photo credit: NASA/Ken Thornsley KSC-06pd0901

CAPE CANAVERAL, Fla. -- Bathed in xenon lights, space shuttle Atlantis embarks on its final journey from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. First motion was at 8:42 p.m. EDT. It will take the crawler-transporter about six hours to carry the shuttle, attached to its external fuel tank and solid rocket boosters, to the seaside launch pad. The milestone move, known as "rollout," paves the way for the launch of the STS-135 mission to the International Space Station, targeted for July 8. 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/Terry Zaperach KSC-2011-4254

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery makes the last leg of its journey, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about six hours to complete the move atop a crawler-transporter. Rollout sets the stage for Discovery's STS-133 crew to practice countdown and launch procedures during the Terminal Countdown Demonstration Test in mid-October. Targeted to liftoff Nov. 1, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. Photo credit: NASA/Jack Pfaller KSC-2010-4729

CAPE CANAVERAL, Fla. – In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, the platforms are retracted from around space shuttle Endeavour, attached to its external tank and solid rocket boosters, moments before its move from High Bay 1 to Launch Pad 39A begins. First motion was at 4:13 a.m. EST Jan. 6. The 3.4-mile trip, known as rollout, takes about six hours. Rollout is a significant milestone in launch processing activities. The primary payload for the STS-130 mission is the International Space Station's Node 3, Tranquility, a pressurized module that will provide room for many of the station's life support systems. Attached to one end of Tranquility is a cupola, a unique work area with six windows on its sides and one on top. The cupola resembles a circular bay window and will provide a vastly improved view of the station's exterior. The multi-directional view will allow the crew to monitor spacewalks and docking operations, as well as provide a spectacular view of Earth and other celestial objects. The module was built in Turin, Italy, by Thales Alenia Space for the European Space Agency. Space shuttle Endeavour's STS-130 mission is targeted for launch at 4:39 a.m. EST Feb. 7. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Amanda Diller KSC-2010-1026

CARD 2 OF 2. NASA public domain image. Kennedy space center.

CAPE CANAVERAL, Fla. –– On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the payload canister is lifted toward the payload changeout room, or PCR, on the rotating service structure. The canister's cargo of Hubble Space Telescope equipment will be deposited in the PCR and later transferred to the payload bay on space shuttle Atlantis, at right. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett KSC-2009-2783

KENNEDY SPACE CENTER, Fla. -- Floodlights reveal the Space Shuttle Discovery after rollback of the Rotating Service Structure in preparation for launch on mission STS-105. Above the external tank, the “beanie cap” is poised, waiting for loading of the propellants. The cap, or vent hood, is on the end of the gaseous oxygen vent arm that allows gaseous oxygen vapors to vent away from the Space Shuttle. On the mission, Discovery will be transporting the Expedition Three crew and several payloads and scientific experiments to the ISS, including the Early Ammonia Servicer (EAS) tank. The EAS, which will support the thermal control subsystems until a permanent system is activated, will be attached to the Station during two spacewalks. The three-member Expedition Two crew will be returning to Earth aboard Discovery after a five-month stay on the Station. Launch is scheduled for 5:38 p.m. EDT Aug. 9 KSC01padig260

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KENNEDY SPACE CENTER, Fla. -- Floodlights reveal the Space Shuttle Discovery after rollback of the Rotating Service Structure in preparation for launch on mission STS-105. Above the external tank, the “beanie cap” is poised, waiting for loading of the propellants. The cap, or vent hood, is on the end of the gaseous oxygen vent arm that allows gaseous oxygen vapors to vent away from the Space Shuttle. On the mission, Discovery will be transporting the Expedition Three crew and several payloads and scientific experiments to the ISS, including the Early Ammonia Servicer (EAS) tank. The EAS, which will support the thermal control subsystems until a permanent system is activated, will be attached to the Station during two spacewalks. The three-member Expedition Two crew will be returning to Earth aboard Discovery after a five-month stay on the Station. Launch is scheduled for 5:38 p.m. EDT Aug. 9

Space Shuttle Program

The Space Shuttle program was the United States government's manned launch vehicle program from 1981 to 2011, administered by NASA and officially beginning in 1972. The Space Shuttle system—composed of an orbiter launched with two reusable solid rocket boosters and a disposable external fuel tank— carried up to eight astronauts and up to 50,000 lb (23,000 kg) of payload into low Earth orbit (LEO). When its mission was complete, the orbiter would re-enter the Earth's atmosphere and lands as a glider. Although the concept had been explored since the late 1960s, the program formally commenced in 1972 and was the focus of NASA's manned operations after the final Apollo and Skylab flights in the mid-1970s. It started with the launch of the first shuttle Columbia on April 12, 1981, on STS-1. and finished with its last mission, STS-135 flown by Atlantis, in July 2011.