CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, retired NASA astronaut Jon McBride mingles with about 50 eighth-grade students from McNair Magnet Middle School in Rockledge, Fla., and other invited guests who are at the Shuttle Landing Facility (SLF) to watch shuttle Discovery return from space for the last time. Discovery touched down on Runway 15 at 11:57 a.m. EST, completing the 13-day STS-133 mission to the International Space Station. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, workers practice assembly and disassembling a mobile sling and crane, part of a portable mate-demate device. The portable sling and crane will be used to lift shuttles off their 747 carrier aircraft for delivery to museums next year. Shuttle Discovery will go to the Smithsonian's National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va., Endeavour will go to the California Science Center in Los Angeles and Enterprise will be moved from the Smithsonian to the Intrepid Sea, Air and Space Museum in New York. Shuttle Atlantis will go to the Kennedy Space Center Visitor Complex and won't require use of the portable sling and crane. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, workers practice assembly and disassembling a mobile sling and crane, part of a portable mate-demate device. The portable sling and crane will be used to lift shuttles off their 747 carrier aircraft for delivery to museums next year. Shuttle Discovery will go to the Smithsonian's National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va., Endeavour will go to the California Science Center in Los Angeles and Enterprise will be moved from the Smithsonian to the Intrepid Sea, Air and Space Museum in New York. Shuttle Atlantis will go to the Kennedy Space Center Visitor Complex and won't require use of the portable sling and crane. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, workers practice assembly and disassembling a mobile sling and crane, part of a portable mate-demate device. The portable sling and crane will be used to lift shuttles off their 747 carrier aircraft for delivery to museums next year. Shuttle Discovery will go to the Smithsonian's National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va., Endeavour will go to the California Science Center in Los Angeles and Enterprise will be moved from the Smithsonian to the Intrepid Sea, Air and Space Museum in New York. Shuttle Atlantis will go to the Kennedy Space Center Visitor Complex and won't require use of the portable sling and crane. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, workers practice assembly and disassembling a mobile sling and crane, part of a portable mate-demate device (image left). The portable sling and crane will be used to lift shuttles off their 747 carrier aircraft for delivery to museums next year. Shuttle Discovery will go to the Smithsonian's National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va., Endeavour will go to the California Science Center in Los Angeles and Enterprise will be moved from the Smithsonian to the Intrepid Sea, Air and Space Museum in New York. Shuttle Atlantis will go to the Kennedy Space Center Visitor Complex and won't require use of the portable sling and crane. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, workers practice assembly and disassembling a mobile sling and crane, part of a portable mate-demate device. The portable sling and crane will be used to lift shuttles off their 747 carrier aircraft for delivery to museums next year. Shuttle Discovery will go to the Smithsonian's National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va., Endeavour will go to the California Science Center in Los Angeles and Enterprise will be moved from the Smithsonian to the Intrepid Sea, Air and Space Museum in New York. Shuttle Atlantis will go to the Kennedy Space Center Visitor Complex and won't require use of the portable sling and crane. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, workers practice assembly and disassembling a mobile sling and crane, part of a portable mate-demate device. The portable sling and crane will be used to lift shuttles off their 747 carrier aircraft for delivery to museums next year. Shuttle Discovery will go to the Smithsonian's National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va., Endeavour will go to the California Science Center in Los Angeles and Enterprise will be moved from the Smithsonian to the Intrepid Sea, Air and Space Museum in New York. Shuttle Atlantis will go to the Kennedy Space Center Visitor Complex and won't require use of the portable sling and crane. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – A team of aerospace workers accompanies space shuttle Discovery along the towway to the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Discovery is towed to the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida. At the SLF, Discovery will be hoisted onto the back of the Shuttle Carrier Aircraft, or SCA, in the background, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way from the Launch Complex 39 area to the Shuttle Landing Facility or SLF, at NASA’s Kennedy Space Center in Florida. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery is towed along the access road to the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way to the Shuttle Landing Facility, or SLF, in darkness at NASA’s Kennedy Space Center in Florida. Its move from the Vehicle Assembly Building got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Preparations are under way to tow space shuttle Discovery to the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida. Discovery was in storage in the Vehicle Assembly Building’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to transport Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery backs out of the Vehicle Assembly Building, or VAB, at NASA’s Kennedy Space Center in Florida, for its trip to the Shuttle Landing Facility, or SLF. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to transport Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA’s Kennedy Space Center in Florida, space shuttle Discovery makes its way along the access road past the hangar at the Shuttle Landing Facility, or SLF, in darkness. Its move got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – Space shuttle Discovery begins its trip to the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida. In the background is the 525-foot-tall Vehicle Assembly Building, or VAB. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way in darkness to the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida. Its move got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Also on the ramp is a pair of T-38 training jets. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – Space Shuttle Discovery’s tow from the Vehicle Assembly Building to the Shuttle Landing Facility, or SLF, is complete as the day breaks over NASA’s Kennedy Space Center in Florida. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – A team of aerospace workers accompanies space shuttle Discovery as it is towed to the Shuttle Landing Facility, or SLF, in darkness at NASA’s Kennedy Space Center in Florida. Its move from the Vehicle Assembly Building, in the background, got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Space shuttle Discovery is towed to the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida. In the background is the 525-foot-tall Vehicle Assembly Building, or VAB. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way in darkness to the Shuttle Landing Facility, or SLF, 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. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way to the Shuttle Landing Facility, or SLF, in darkness at NASA’s Kennedy Space Center in Florida. Its move from the Vehicle Assembly Building got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way to the Shuttle Landing Facility, or SLF, before dawn at NASA’s Kennedy Space Center in Florida. Its move from the Vehicle Assembly Building got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – A team of aerospace technicians accompanies space shuttle Discovery as it is towed for the final time from the Launch Complex 39 area to the Shuttle Landing Facility or SLF, at NASA’s Kennedy Space Center in Florida. A tail cone has been installed over Discovery’s three replica shuttle main engines to reduce aerodynamic drag and turbulence during its upcoming ferry flight. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way in darkness along the access road to the Shuttle Landing Facility, or SLF, 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. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way in darkness along the access road to the Shuttle Landing Facility, or SLF, 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. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Rain falls on space shuttle Discovery as it departs from NASA Kennedy Space Center’s Launch Complex 39 area for the final time. Discovery is on its way from the Vehicle Assembly Building’s high bay 4 to the Shuttle Landing Facility, or SLF. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Rain begins to fall on space shuttle Discovery as it says good-bye to NASA Kennedy Space Center’s Launch Complex 39 area for the final time. Discovery is on its way from the Vehicle Assembly Building’s high bay 4 to the Shuttle Landing Facility, or SLF. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Preparations to tow space shuttle Discovery from the Vehicle Assembly Building, or VAB, to the Shuttle Landing Facility, or SLF, are under way at NASA’s Kennedy Space Center in Florida. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to transport Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Also on the ramp is a pair of T-38 training jets. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery makes its way to the Shuttle Landing Facility, or SLF, before dawn at NASA’s Kennedy Space Center in Florida. Its move from the Vehicle Assembly Building got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Space Shuttle Discovery’s move from the Vehicle Assembly Building to the Shuttle Landing Facility, or SLF, is complete as the day breaks over NASA’s Kennedy Space Center in Florida. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Discovery is towed along the access road to the Shuttle Landing Facility, or SLF, 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. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Discovery rolls out of the Vehicle Assembly Building, or VAB, at NASA’s Kennedy Space Center in Florida, into darkness for its trip to the Shuttle Landing Facility, or SLF. Its move got under way at 5 a.m. EDT. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to transport Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Preparations to roll space shuttle Discovery out of the Vehicle Assembly Building, or VAB, to the Shuttle Landing Facility, or SLF, are under way at NASA’s Kennedy Space Center in Florida. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to transport Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA’s Kennedy Space Center in Florida, NASA’s Shuttle Carrier Aircraft modified 747 jet, or SCA, has arrived at the Shuttle Landing Facility, or SLF, after a 5-hour flight from Edwards Air Force Base in California. On the SLF tarmac, members of the media talk to the SCA pilots. During the Space Shuttle Program’s transition and retirement processing, Discovery was prepared for display at Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. Discovery is scheduled to be transported atop the SCA, designated NASA 905, to Dulles International Airport in Virginia on April 17 and then moved to the Smithsonian for permanent public display on April 19. The SCA is assigned to the remaining ferry missions, delivering the shuttles to their permanent public display sites. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – Space shuttle Discovery is towed along the access road to the Shuttle Landing Facility, or SLF, before dawn at NASA’s Kennedy Space Center in Florida. Its move from the Vehicle Assembly Building got under way at 5 a.m. EDT. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Space shuttle Discovery backs out of the Vehicle Assembly Building, or VAB, at NASA’s Kennedy Space Center in Florida, for its trip to the Shuttle Landing Facility, or SLF. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to transport Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space Shuttle Discovery’s move from the Vehicle Assembly Building to the Shuttle Landing Facility, or SLF, is complete as the sun comes up over 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. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Space shuttle Discovery completes a three-point turnaround outside the Vehicle Assembly Building, or VAB, at NASA’s Kennedy Space Center in Florida, for its trip to the Shuttle Landing Facility, or SLF. Its move got under way at 5 a.m. EDT. Discovery was in storage in the VAB’s high bay 4 awaiting departure from Kennedy’s Launch Complex 39 area for the final time. At the SLF, Discovery will be hoisted onto a Shuttle Carrier Aircraft, or SCA, with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to transport Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. The mate/demate device, known as the MDD, also is in view and is where transition and retirement teams prepared the duo for the ferry flight. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. The mate/demate device, known as the MDD, also is in view and is where transition and retirement teams prepared the duo for the ferry flight. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. The mate/demate device, known as the MDD, also is in view and is where transition and retirement teams prepared the duo for the ferry flight. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. Also on the ramp is a pair of T-38 training jets. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The mate/demate device, known as the MDD, is in view and is where transition and retirement teams prepared the duo for the ferry flight. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19. 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/Kim Shiflett

CAPE CANAVERAL, Fla. – At the Shuttle Landing Facility, or SLF, at NASA’s Kennedy Space Center in Florida, space shuttle Discovery rolls past the Shuttle Carrier Aircraft with which it will be mated. Discovery will be hoisted onto the SCA with the aid of a mate-demate device. The SCA, a modified Boeing 747 jet airliner, is scheduled to ferry Discovery to the Washington Dulles International Airport in Virginia on April 17, after which the shuttle will be placed on permanent public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- Heat from space shuttle Endeavour's auxiliary power units (APUs), which provide hydraulic control, can be seen at the back of the shuttle, near the vertical tail. Endeavour landed for the final time on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida, marking the 25th night landing of the Space Shuttle Program. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. On board are STS-134 Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Mike Fincke, Drew Feustel, Greg Chamitoff and the European Space Agency's Roberto Vittori. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which has spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kenny Allen

CAPE CANAVERAL, Fla. -- STS-134 Pilot Greg H. Johnson performs touch-and-go landings aboard a Shuttle Training Aircraft (STA) on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. STAs are Gulfstream II business jets that are modified to mimic the shuttle's handling during the final phase of landing. Practice landings are part of standard training before space shuttle Endeavour's upcoming STS-134 launch to the International Space Station. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the space station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 spotlight space shuttle Atlantis as it nears touchdown for the last time at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. - The "towback" vehicle slowly pulls Space shuttle Discovery from the Shuttle Landing Facility to Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Discovery touched down on Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialists Mike Fincke, left, chats with STS-134 Assistant Launch Director Pete Nickolenko following the successful return of space shuttle Endeavour to NASA's Kennedy Space Center in Florida. Endeavour's final return from space completed the 16-day, 6.5-million-mile STS-134 mission. Main gear touchdown on the Shuttle Landing Facility's Runway 15 was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Space shuttle Discovery rolls to a stop on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Discovery's final return from space completed the 13-day, 5.3-million-mile STS-133 mission. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Tim Powers

CAPE CANAVERAL, Fla. -- Xenon lights help lead space shuttle Endeavour home to NASA's Kennedy Space Center in Florida. Endeavour landed for the final time on the Shuttle Landing Facility's Runway 15, marking the 25th night landing of NASA's Space Shuttle Program. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. On board are STS-134 Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Mike Fincke, Drew Feustel, Greg Chamitoff and the European Space Agency's Roberto Vittori. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which has spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kevin O'Connell

CAPE CANAVERAL, Fla. - Space shuttle Discovery touches down on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 11:57 a.m. EST, completing the 13-day STS-133 mission to the International Space Station. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Shuttle Launch Director Mike Leinbach, right, greets STS-134 Commander Mark Kelly, who arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. While at Kennedy, space shuttle Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Bob Cabana, director of NASA's Kennedy Space Center in Florida, checks out the underside of space shuttle Discovery, following its final return from space. Touchdown on the Shuttle Landing Facility's Runway 15 was at 11:57 a.m. EST, bringing an end to the 13-day STS-133 mission to the International Space Station. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 reveal that the drag chute has deployed behind space shuttle Atlantis to slow the shuttle as it lands for the last time at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Endeavour's unfurled drag chute as the vehicle rolls to a stop on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida for the final time. Heat from the shuttle's auxiliary power units (APUs), which provide hydraulic control, can be seen at the back of Endeavour, near the vertical tail. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. On board are STS-134 Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Mike Fincke, Drew Feustel, Greg Chamitoff and the European Space Agency's Roberto Vittori. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which has spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kenny Allen

CAPE CANAVERAL, Fla. - Space shuttle Discovery's "towback" vehicle slowly pulls the spacecraft from the Shuttle Landing Facility to Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. A purge unit that pumps conditioned air into a shuttle after landing is connected to Discovery's aft end. Discovery touched down on Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, invited guests, managers and employees gather near the Air Traffic Control Tower at the Shuttle Landing Facility (SLF) to watch shuttle Discovery return from space for the last time. Discovery touched down on Runway 15 at 11:57 a.m. EST, completing the 13-day STS-133 mission to the International Space Station. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- Space shuttle Discovery's STS-133 crew participates in a post-landing news conference in the Press Site TV Auditorium at NASA's Kennedy Space Center in Florida. From left, are NASA Public Affairs Officer George Diller, STS-133 Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Alvin Drew, Steve Bowen, Michael Barratt and Nicole Stott. Discovery and crew landed on the Shuttle Landing Facility's Runway 15 at 11:57 a.m., completing a 13-day, 5.3-million-mile mission to the International Space Station. STS-133 delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Commander Mark Kelly performs touch-and-go landings aboard a Shuttle Training Aircraft (STA) on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. STAs are Gulfstream II business jets that are modified to mimic the shuttle's handling during the final phase of landing. Practice landings are part of standard training before space shuttle Endeavour's upcoming STS-134 launch to the International Space Station. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the space station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Space shuttle Discovery touches down on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 11:57 a.m. EST, completing the 13-day STS-133 mission to the International Space Station. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Tom Farrar

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, xenon lights positioned at the end of Runway 15 illuminate the Shuttle Landing Facility for space shuttle Atlantis' final return from space. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. - Space shuttle Discovery casts a shadow in the water beside the towway on its slow trip from the Shuttle Landing Facility to Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Discovery touched down on Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Space shuttle Discovery touches down on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 11:57 a.m. EST, completing the 13-day STS-133 mission to the International Space Station. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Endeavour's unfurled drag chute as the vehicle rolls to a stop on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida for the final time. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. On board are STS-134 Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Mike Fincke, Drew Feustel, Greg Chamitoff and the European Space Agency's Roberto Vittori. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which has spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Tony Gray

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Michael Fincke prepares to depart the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. While at Kennedy, space shuttle Endeavour's crew participated in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Fincke will return to NASA's Johnson Space Center in Houston to resume training for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 29 at 3:47 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Space shuttle Discovery's tail fin clears the hangar door of Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Discovery touched down on the Shuttle Landing Facility's Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Commander Mark Kelly completes touch-and-go landings aboard a Shuttle Training Aircraft (STA) on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. STAs are Gulfstream II business jets that are modified to mimic the shuttle's handling during the final phase of landing. Practice landings are part of standard training before space shuttle Endeavour's STS-134 launch to the International Space Station. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the space station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - The Convoy Command Vehicle leads space shuttle Discovery and the landing convoy along the towway from the Shuttle Landing Facility to Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Discovery touched down on Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Xenon lights help lead space shuttle Endeavour home to NASA's Kennedy Space Center in Florida. Endeavour landed for the final time on the Shuttle Landing Facility's Runway 15, marking the 25th night landing of NASA's Space Shuttle Program. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. On board are STS-134 Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Mike Fincke, Drew Feustel, Greg Chamitoff and the European Space Agency's Roberto Vittori. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which has spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/George Roberto

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, about 50 eighth-grade students from McNair Magnet Middle School in Rockledge, Fla., and other invited guests watch shuttle Discovery return from space for the last time. Discovery touched down on the Shuttle Landing Facility's Runway 15 at 11:57 a.m. EST, completing the 13-day STS-133 mission to the International Space Station. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- Shuttle Launch Director Mike Leinbach, left, talks to STS-133 Pilot Eric Boe underneath space shuttle Discovery on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida. Boe and his crew wrapped up a 13-day, 5.3-million-mile mission to the International Space Station at 11:57 a.m. STS-133 delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-133 Mission Specialist Alvin Drew admires space shuttle Discovery on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida. Drew and his crewmates returned from a 13-day, 5.3-million-mile mission to the International Space Station at 11:57 a.m. EST. STS-133 delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Commander Mark Kelly stands in front of a T-38 jet on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. While at Kennedy, space shuttle Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Endeavour as it approaches Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. On board are STS-134 Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Mike Fincke, Drew Feustel, Greg Chamitoff and the European Space Agency's Roberto Vittori. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which has spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kevin O'Connell

CAPE CANAVERAL, Fla. -- STS-134 Commander Mark Kelly addresses media gathered on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida following the successful landing of space shuttle Endeavour. From left, are the European Space Agency's Roberto Vittori, Pilot Greg H. Johnson, Kelly, and Mission Specialists Mike Fincke, Greg Chamitoff and Drew Feustel. The crew returned to Earth at 2:35 a.m. EDT on Runway 15, completing a 16-day, 6.5-million mile journey to the International Space Station. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialists Drew Feustel, left, and Roberto Vittori with the European Space Agency, right, admire space shuttle Endeavour with NASA astronaut Randy Bresnik at NASA's Kennedy Space Center in Florida. Endeavour's final return from space completed the 16-day, 6.5-million-mile STS-134 mission. Main gear touchdown on the Shuttle Landing Facility's Runway 15 was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Mike Fincke, left, Pilot Greg H. Johnson and Commander Mark Kelly talk with employees following the successful return of space shuttle Endeavour to NASA's Kennedy Space Center in Florida. Endeavour's final return from space completed the 16-day, 6.5-million-mile STS-134 mission. Main gear touchdown on the Shuttle Landing Facility's Runway 15 was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Commander Mark Kelly prepares to take flight in a Shuttle Training Aircraft (STA) to perform touch-and-go landings on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. STAs are Gulfstream II business jets that are modified to mimic the shuttle's handling during the final phase of landing. Practice landings are part of standard training before space shuttle Endeavour's upcoming STS-134 launch to the International Space Station. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the space station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Commander Mark Kelly arrives on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. While at Kennedy, space shuttle Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Pilot Greg H. Johnson completes touch-and-go landings aboard a Shuttle Training Aircraft (STA) on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. STAs are Gulfstream II business jets that are modified to mimic the shuttle's handling during the final phase of landing. Practice landings are part of standard training before space shuttle Endeavour's STS-134 launch to the International Space Station. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the space station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 spotlight space shuttle Atlantis as it nears touchdown for the last time at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Space shuttle Discovery touches down on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 11:57 a.m. EST, completing the 13-day STS-133 mission to the International Space Station. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Chuck Tintera

CAPE CANAVERAL, Fla. - Space shuttle Discovery appears to be a mirage as it makes its way down Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Discovery's final return from space completed the 13-day, 5.3-million-mile STS-133 mission. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Tony Gray and Tom Farrar

CAPE CANAVERAL, Fla. - Space shuttle Discovery's "towback" vehicle slowly pulls the spacecraft toward Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Discovery touched down on the Shuttle Landing Facility's Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The landing convoy that will make space shuttle Endeavour safe and secure for towing to its processing hangar begins to pull up around the vehicle following wheelstop on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida. Endeavour's final return from space completed the 16-day, 6.5-million-mile STS-134 mission. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- NASA managers welcome space shuttle Discovery's STS-133 crew members home to Kennedy Space Center in Florida. In the foreground, Discovery Flow Director Stephanie Stilson hugs STS-133 Pilot Eric Boe. Beside them, Shuttle Launch Director Mike Leinbach congratulates Mission Specialist Alvin Drew on a successful mission. Discovery and its six-member crew landed on the Shuttle Landing Facility's Runway 15 at 11:57 a.m. EST, bringing an end to the 13-day, 5.3-million-mile mission to the International Space Station. STS-133 delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Space shuttle Discovery, pulled by its "towback" vehicle, approaches Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Towering above the processing bays is the 525-foot-tall Vehicle Assembly Building. Discovery touched down on the Shuttle Landing Facility's Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Photographers are in position near the towway to capture space shuttle Discovery as it is towed from the Shuttle Landing Facility to Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Discovery touched down on Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. - Space shuttle Discovery, its drag chute unfurled, appears to be a mirage as it travels down Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Discovery's final return from space completed the 13-day, 5.3-million-mile STS-133 mission. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Tony Gray and Tom Farrar

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Roberto Vittori, with the European Space Agency, prepares to depart the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. While at Kennedy, space shuttle Endeavour's crew participated in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Vittori will return to NASA's Johnson Space Center in Houston to resume training for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 29 at 3:47 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Streams of smoke trail from the main landing gear tires as space shuttle Discovery touches down on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 13-days in space, completing the 5.3-million-mile STS-133 mission. Main gear touchdown was at 11:57:17 a.m., followed by nose gear touchdown at 11:57:28, and wheelstop at 11:58:14 a.m. On board are Commander Steve Lindsey, Pilot Eric Boe, and Mission Specialists Nicole Stott, Michael Barratt, Alvin Drew and Steve Bowen. Discovery and its six-member crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the orbiting outpost. STS-133 was Discovery's 39th and final mission. This was the 133rd Space Shuttle Program mission and the 35th shuttle voyage to the space station. Photo credit: NASA/Linda Perry

CAPE CANAVERAL, Fla. - Space shuttle Discovery is half in, half out of Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Discovery touched down on the Shuttle Landing Facility's Runway 15 at 11:57 a.m., bringing an end to its 39th and final spaceflight mission, STS-133. Discovery and its six-member STS-133 crew delivered the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Inside the processing facility, Discovery will be prepared for future public display. Photo credit: NASA/Kim Shiflett