KENNEDY SPACE CENTER, Fla. -- Just after sundown, the Rotating Service Structure is rolled back to reveal Space Shuttle Endeavour, mated with its solid rocket boosters (left and right) and external tank (center), poised for launch on mission STS-99. Known as the Shuttle Radar Topography Mission (SRTM), STS-99 is scheduled to lift off 12:47 p.m. EST from Launch Pad 39A. The SRTM will chart a new course to produce unrivaled 3-D images of the Earth's surface, using two antennae and a 200-foot-long section of space station-derived mast protruding from the payload bay. The result of the Shuttle Radar Topography Mission could be close to 1 trillion measurements of the Earth's topography. Besides contributing to the production of better maps, these measurements could lead to improved water drainage modeling, more realistic flight simulators, better locations for cell phone towers, and enhanced navigation safety. The mission is expected to last about 11days, with Endeavour landing at KSC Friday, Feb. 11, at 4:55 p.m. EST KSC-00pp0125

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A large space shuttle sitting on top of a sandy beach. Discovery space shuttle rollout launch pad.

KENNEDY SPACE CENTER, FLA. -- The Rotating Service Structure is rolled back to reveal Space Shuttle Atlantis on pad 39B prior to launch. The Shuttle is scheduled for launch Oct. 7 at 3:46 p.m. EDT on mission STS-112. KSC-02pd1440

KENNEDY SPACE CENTER, FLA. -- Space shuttle Atlantis is revealed on Launch Pad 39A at NASA's Kennedy Space Center after the rotating service structure, or RSS, at left of the pad was rolled back. Rollback was complete at 9:49 p.m. EST. The RSS provides protected access to the orbiter for crew entry and servicing of payloads at the pad. Beneath the shuttle is the mobile launcher platform which supports the shuttle until liftoff. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-122. Launch was originally set for Dec. 6 but was rescheduled to 3:21 p.m. Dec. 9. The delay was caused by problems with the external tank's engine cutoff sensor system that arose during tanking on Dec. 6. Atlantis will carry the Columbus Laboratory, the European Space Agency's largest contribution to the construction of the International Space Station. It will support scientific and technological research in a microgravity environment. Permanently attached to the Harmony node of the space station, the laboratory will carry out experiments in materials science, fluid physics and biosciences, as well as perform a number of technological applications. Photo credit: NASA/Amanda Diller KSC-07pd3595

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, 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. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett KSC-2011-1262

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery is attached to Launch Pad 39A, completing "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-2010-4732

KENNEDY SPACE CENTER, Fla. -- Just after sundown, the Rotating Service Structure is rolled back to reveal Space Shuttle Endeavour, mated with its solid rocket boosters (left and right) and external tank (center), poised for launch on mission STS-99. Known as the Shuttle Radar Topography Mission (SRTM), STS-99 is scheduled to lift off 12:47 p.m. EST from Launch Pad 39A. The SRTM will chart a new course to produce unrivaled 3-D images of the Earth's surface, using two antennae and a 200-foot-long section of space station-derived mast protruding from the payload bay. The result of the Shuttle Radar Topography Mission could be close to 1 trillion measurements of the Earth's topography. Besides contributing to the production of better maps, these measurements could lead to improved water drainage modeling, more realistic flight simulators, better locations for cell phone towers, and enhanced navigation safety. The mission is expected to last about 11days, with Endeavour landing at KSC Friday, Feb. 11, at 4:55 p.m. EST KSC-00pp0125

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KENNEDY SPACE CENTER, Fla. -- Just after sundown, the Rotating Service Structure is rolled back to reveal Space Shuttle Endeavour, mated with its solid rocket boosters (left and right) and external tank (center), poised for launch on mission STS-99. Known as the Shuttle Radar Topography Mission (SRTM), STS-99 is scheduled to lift off 12:47 p.m. EST from Launch Pad 39A. The SRTM will chart a new course to produce unrivaled 3-D images of the Earth's surface, using two antennae and a 200-foot-long section of space station-derived mast protruding from the payload bay. The result of the Shuttle Radar Topography Mission could be close to 1 trillion measurements of the Earth's topography. Besides contributing to the production of better maps, these measurements could lead to improved water drainage modeling, more realistic flight simulators, better locations for cell phone towers, and enhanced navigation safety. The mission is expected to last about 11days, with Endeavour landing at KSC Friday, Feb. 11, at 4:55 p.m. EST

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.