KENNEDY SPACE CENTER, Fla. -- As the sky grows lighter, , the payload canister (left) with the Integrated Truss Structure Z1 inside is slowly lifted up the side of the Rotating Service Structure to the Payload Changeout Room. There the Z1 truss will be removed and later transferred to Space Shuttle Discovery’s payload bay. The Z1 truss is the first of 10 that will become the backbone of the International Space Station, eventually stretching the length of a football field. Along with its companion payload, the third Pressurized Mating Adapter, the Z1 is scheduled to be launched aboard Discovery Oct. 5 at 9:38 p.m. EDT KSC00pp1355

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CAPE CANAVERAL, Fla. – Space shuttle Discovery approaches the mate-demate device, or MDD, at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida. A tail cone has been installed over its three replica shuttle main engines to reduce aerodynamic drag and turbulence during its upcoming ferry flight. The MDD is a large gantry-like steel structure used to hoist a shuttle off the ground and position it onto the back of a Shuttle Carrier Aircraft, or SCA. The SCA is a Boeing 747 jet, originally manufactured for commercial use, which was modified by NASA to transport the shuttles between destinations on Earth. The SCA designated NASA 905 is assigned to the remaining ferry missions, delivering the shuttles to their permanent public display sites. Discovery’s new home will be the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center in Chantilly, Va. For more information on the SCA, visit http://www.nasa.gov/centers/dryden/news/FactSheets/FS-013-DFRC.html. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Jim Grossmann KSC-2012-2117

STS-134 - EOM - Public domain NASA photogrpaph

KENNEDY SPACE CENTER, FLA. -- On the launch pad, the payload canister with the S0 Integrated Truss Structure moves up the Rotating Service Structure to the payload changeout room for transfer to Space Shuttle Atlantis's payload bay. Part of the payload on mission STS-110, the S0 truss will become the backbone of the orbiting International Space Station (ISS). The S0 truss will be attached to the U.S. Lab, "Destiny," on the 11-day mission. Launch is scheduled for April 4 KSC-02pd0350

KENNEDY SPACE CENTER, Fla. -- As the sky grows lighter, , the payload canister (left) with the Integrated Truss Structure Z1 inside is slowly lifted up the side of the Rotating Service Structure to the Payload Changeout Room. There the Z1 truss will be removed and later transferred to Space Shuttle Discovery’s payload bay. The Z1 truss is the first of 10 that will become the backbone of the International Space Station, eventually stretching the length of a football field. Along with its companion payload, the third Pressurized Mating Adapter, the Z1 is scheduled to be launched aboard Discovery Oct. 5 at 9:38 p.m. EDT KSC00pp1355

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KENNEDY SPACE CENTER, Fla. -- As the sky grows lighter, , the payload canister (left) with the Integrated Truss Structure Z1 inside is slowly lifted up the side of the Rotating Service Structure to the Payload Changeout Room. There the Z1 truss will be removed and later transferred to Space Shuttle Discovery’s payload bay. The Z1 truss is the first of 10 that will become the backbone of the International Space Station, eventually stretching the length of a football field. Along with its companion payload, the third Pressurized Mating Adapter, the Z1 is scheduled to be launched aboard Discovery Oct. 5 at 9:38 p.m. EDT

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.