CAPE CANAVERAL, Fla. - At NASA’s Kennedy Space Center, space shuttle Endeavour is slowly lifted into the upper levels of the Vehicle Assembly Building for transfer into high bay 1 for mating with its external fuel tank and solid rocket boosters, seen below it. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - In high bay 1 of the Vehicle Assembly Building at NASA’s Kennedy Space Center, space shuttle Endeavour is lowered alongside its external fuel tank and solid rocket boosters for mating. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - In high bay 1 of the Vehicle Assembly Building at NASA’s Kennedy Space Center, space shuttle Endeavour is lowered alongside its external fuel tank and solid rocket boosters for mating. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. –- Dark gray clouds hover over the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, part of a strong weather system that included crosswinds and anvil clouds blowing across the state. The weather concerns prevented space shuttle Endeavour and its crew from returning to Kennedy, the primary end-of-mission landing site. Instead, Endeavour landed safely at 4:25 p.m. at Edwards Air Force Base in California after traveling more than 6.6 million miles in space. The main landing gear touched down at Edwards at 4:25:06 p.m. EST. The nose landing gear touched down at 4:25:21 p.m. and wheel stop was at 4:26:03 p.m. The STS-126 mission was the 27th flight to the International Space Station, carrying equipment and supplies in the Multi-Purpose Logistics Module Leonardo. The mission featured four spacewalks and work to prepare the space station to house six crew members for long-duration missions. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. - Suspended by an overhead crane, space shuttle Endeavour is being raised to a vertical position n the transfer aisle of the Vehicle Assembly Building at NASA’s Kennedy Space Center. The shuttle will be lifted into high bay 1 for mating with its external fuel tank and solid rocket boosters. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Suspended by an overhead crane, space shuttle Endeavour is being raised to a vertical position in the transfer aisle of the Vehicle Assembly Building at NASA’s Kennedy Space Center. The shuttle will be lifted into high bay 1 for mating with its external fuel tank and solid rocket boosters. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA’s Kennedy Space Center, space shuttle Endeavour is lowered into high bay 1 of the Vehicle Assembly Building for mating with its external fuel tank and solid rocket boosters, waiting below. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Suspended over the transfer aisle of the Vehicle Assembly Building at NASA’s Kennedy Space Center, space shuttle Endeavour is slowly lifted into the upper levels for transfer into high bay 1 for mating with its external fuel tank and solid rocket boosters. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - In high bay 1 of the Vehicle Assembly Building at NASA’s Kennedy Space Center, space shuttle Endeavour is lowered alongside its external fuel tank and solid rocket boosters for mating. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Space shuttle Endeavour is suspended over the transfer aisle of the Vehicle Assembly Building at NASA’s Kennedy Space Center. The shuttle will be lifted into high bay 1 for mating with its external fuel tank and solid rocket boosters. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Endeavour is raised off the orbiter transporter by an overhead crane in the transfer aisle of the Vehicle Assembly Building at NASA’s Kennedy Space Center. The shuttle will be lifted into high bay 1 for mating with its external fuel tank and solid rocket boosters. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA’s Kennedy Space Center, space shuttle Endeavour is slowly lowered into high bay 1 of the Vehicle Assembly Building for mating with its external fuel tank and solid rocket boosters. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA’s Kennedy Space Center, a technician (lower left) monitors the progress of space shuttle Endeavour as it is lowered into high bay 1 of the Vehicle Assembly Building for mating with its external fuel tank and solid rocket boosters, waiting below. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39B. Endeavour is designated the rescue spacecraft for space shuttle Atlantis’ STS-125 mission to NASA’s Hubble Space Telescope, targeted for October. After Atlantis has safely returned from its flight, Endeavour will be moved to Launch Pad 39A for its STS-126 mission to the International Space Station, targeted for November. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, moves past the Launch Control Center at NASA's Kennedy Space Center in Florida as it rolls out to Launch Pad 39B. First motion was at 11:57 p.m. EDT April 16. The 4.2-mile journey is expected to take approximately 7 hours. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, moves along the crawlerway at NASA's Kennedy Space Center in Florida as it rolls out to Launch Pad 39B. First motion out of the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. The 4.2-mile journey is expected to take approximately 7 hours. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, moves out of the Vehicle Assembly Building for rollout to Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion was at 11:57 p.m. EDT April 16. The 4.2-mile journey is expected to take approximately 7 hours. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, arrives on Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion out of the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. The 4.2-mile journey took approximately 7 hours. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, moves out of the Vehicle Assembly Building for rollout to Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion was at 11:57 p.m. EDT April 16. The 4.2-mile journey is expected to take approximately 7 hours. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Just before dawn, space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, is on Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion out of the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. The shuttle was secure on the pad at 7:17 a.m. EDT April 17. On the left of the shuttle is the White Room at the end of the orbiter access arm, 147 feet above the pad. When in place against the shuttle, the White Room provides access into the crew compartment on the shuttle. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, moves along the crawlerway at NASA's Kennedy Space Center in Florida as it rolls out to Launch Pad 39B. First motion was at 11:57 p.m. EDT April 16. The 4.2-mile journey is expected to take approximately 7 hours. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, space shuttle Endeavour slowly backs out of Orbiter Processing Facility-2 to begin its roll to the Vehicle Assembly Building. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to a lifting sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. -- At sunset, Space Shuttle Endeavour, atop the lighted mobile launcher platform, exits the Vehicle Assembly Building for rollout to Launch Pad 39A. First motion out of the VAB was at 8:10 p.m. July 10, and the shuttle was hard down on the pad at 3:02 a.m. July 11. Seen below the orbiter's wings and attached to the launcher platform are the tail masts, which provide several umbilical connections to the orbiter, including a liquid-oxygen line through one and a liquid-hydrogen line through another. The shuttle and platform are being carried by the crawler-transporter. The trip will take between six and eight hours. Endeavour is scheduled to launch on mission STS-118 on Aug. 7. During the mission, Endeavour will carry into orbit the S5 truss, SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and will mark the first flight of Mission Specialist Barbara Morgan, the teacher-turned-astronaut whose association with NASA began more than 20 years ago. STS-118 will be the first flight since 2002 for Endeavour, which has undergone extensive modifications, including the addition of safety upgrades already added to orbiters Discovery and Atlantis. Photo credit: NASA/Tom Farrar

KENNEDY SPACE CENTER, FLA. -- Near sunset, Space Shuttle Endeavour, atop the mobile launcher platform, begins moving through the doors of the Vehicle Assembly Building for rollout to Launch Pad 39A. First motion out of the VAB was at 8:10 p.m. July 10, and the shuttle was hard down on the pad at 3:02 a.m. July 11. Seen below the orbiter's wings and attached to the launcher platform are the tail masts, which provide several umbilical connections to the orbiter, including a liquid-oxygen line through one and a liquid-hydrogen line through another. Endeavour is scheduled to launch on mission STS-118 on Aug. 7. During the mission, Endeavour will carry into orbit the S5 truss, SPACEHAB module and external stowage platform 3. The mission is the 22nd flight to the International Space Station and will mark the first flight of Mission Specialist Barbara Morgan, the teacher-turned-astronaut whose association with NASA began more than 20 years ago. STS-118 will be the first flight since 2002 for Endeavour, which has undergone extensive modifications, including the addition of safety upgrades already added to orbiters Discovery and Atlantis. Photo credit: NASA/Tom Farrar

KENNEDY SPACE CENTER, FLA. -- A gopher tortoise searches for food at the edge of a road near Launch Pad 39A. Their primary food sources are low-growing grasses and herbs, with their favorite foods being gopher apple and saw palmetto berries. They will eat the pads, fruits, and flowers of prickly pear cactus as well. They will occasionally also eat bones from dead animals, presumably to get calcium. The gopher tortoise is a cold-blooded reptile that averages 10 inches in length and 9 pounds in weight. Wild tortoises may live from 40 - 60 years, while tortoises in captivity can live more than 100 years. Their range extends from southeastern Louisiana to southeastern South Carolina and throughout all 67 counties in Florida. The gopher tortoise is federally protected as a threatened species except in Florida, where it is listed as a Species of Special Concern by the Florida Fish and Wildlife Conservation Commission. Lands surrounding the Kennedy Space Center are part of the Merritt Island National Wildlife Refuge. Approximately one half of the Refuge's 140,000 acres consists of brackish estuaries and marshes. The remaining lands consist of coastal dunes, scrub oaks, pine forests and flatwoods, and palm and oak hammocks. Photo credit: NASA/Ken Thornsley

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, workers monitor the progress of space shuttle Endeavour as it is transferred from Orbiter Processing Facility-2 to the Vehicle Assembly Building. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to a lifting sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Dawn's early light reveals space shuttle Endeavour secure on Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion of the rollout from the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, space shuttle Endeavour makes its way from Orbiter Processing Facility-2 to the Vehicle Assembly Building. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to a lifting sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Space shuttle Endeavour stands tall and proud on Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion of Endeavour's rollout from the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. Surrounding the pad (seen left and right) are the new lightning towers erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, space shuttle Endeavour rolls into the Vehicle Assembly Building transfer aisle. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to a lifting sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, workers prepare to attach a lifting sling on space shuttle Endeavour following its arrival in the Vehicle Assembly Building transfer aisle. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to the sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Just before dawn, space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, is secure on Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion out of the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Endeavour stands tall and proud on Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion of Endeavour's rollout from the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, a lifting sling is lowered toward space shuttle Endeavour following its arrival in the Vehicle Assembly Building transfer aisle. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to the sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, space shuttle Endeavour arrives in the Vehicle Assembly Building transfer aisle. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to a lifting sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – The rising sun begins to cast its glow over space shuttle Endeavour on Launch Pad 39B at NASA's Kennedy Space Center in Florida. Behind the shuttle is the new lightning tower erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. First motion of Endeavour's rollout from the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, space shuttle Endeavour approaches the Vehicle Assembly Building on its transfer from Orbiter Processing Facility-2. The rollover began at 12:53 a.m. EST and was completed at 2:08 p.m. when Endeavour was towed into the VAB's transfer aisle. Next, Endeavour will be attached to a lifting sling, hoisted over a transom and lowered into High Bay 1, where it will be attached to its external fuel tank and solid rocket boosters. Rollout of the shuttle stack to Kennedy’s Launch Pad 39A, a significant milestone in launch processing activities, is planned for early January 2010. The Italian-built Tranquility module, the primary payload for Endeavour's STS-130 mission, will be installed in the payload bay after the shuttle arrives at the pad. Launch is targeted for early February. For information on the STS-130 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts130/index.html. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Space shuttle Endeavour stands tall and proud on Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion of Endeavour's rollout from the Vehicle Assembly Building was at 11:57 p.m. EDT April 16. Surrounding the pad (seen left and right) are the new lightning towers erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch on the STS-125 mission to service NASA's Hubble Space Telescope. After Atlantis is cleared to land, Endeavour will move to Launch Pad 39A for its upcoming STS-127 mission to the International Space Station, targeted to launch June 13. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour navigates the crawlerway's five percent grade to the hardstand at the top of Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- The newly arrived space shuttle Endeavour is reflected in the water near Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- STS-134 Pilot Greg H. Johnson signs the space shuttle wall tribute in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Kennedy employees who have supported the Space Shuttle Program throughout the last 30 years have been signing the wall as a tribute to the program. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Endeavour is targeted to launch April 19 at 7:48 p.m. EDT on its final spaceflight mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the first light of day, space shuttle Endeavour stands ready for processing at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Operations are under way to roll the protective rotating service structure, at left, around space shuttle Endeavour upon its arrival at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour moves through a high bay door of the Vehicle Assembly Building on its mobile launch platform to begin its nighttime journey to Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- Work is under way to secure space shuttle Endeavour on the six permanent and four extensible pedestals at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Bathed in xenon lights, space shuttle Endeavour begins its nighttime journey from the Vehicle Assembly Building to Launch Pad 39A, illuminated in the background, at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Terry Zaperach

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour basks in the xenon spotlights on its nighttime journey from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Terry Zaperach

CAPE CANAVERAL, Fla. -- The STS-134 crew members pose in front of the space shuttle wall tribute in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Kennedy employees who have supported the Space Shuttle Program throughout the last 30 years have been signing the wall as a tribute to the program. From left, are Mission Specialists Greg Chamitoff, Michael Fincke, Andrew Feustel, Pilot Greg H. Johnson, Mission Specialist Roberto Vittori, with the European Space Agency, and Commander Mark Kelly. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Endeavour is targeted to launch April 19 at 7:48 p.m. EDT on its final spaceflight mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Employees and their friends and families are on hand to witness space shuttle Endeavour, illuminated by xenon lights, on its nighttime journey from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour stands ready for processing beside the rotating and fixed service structures on Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour, illuminated by xenon lights, casts a shadow on the Vehicle Assembly Building as it begins its nighttime journey to Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Terry Zaperach

CAPE CANAVERAL, Fla. -- Sunrise over the Space Coast in Florida finds space shuttle Endeavour settling in on Launch Pad 39A at NASA's Kennedy Space Center. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Michael Fincke signs the space shuttle wall tribute in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Kennedy employees who have supported the Space Shuttle Program throughout the last 30 years have been signing the wall as a tribute to the program. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Endeavour is targeted to launch April 19 at 7:48 p.m. EDT on its final spaceflight mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour is newly arrived at Launch Pad 39A near the Atlantic seashore at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Work platforms on the fixed service structure are positioned against space shuttle Endeavour following its arrival at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Four attach posts on each of two solid rocket boosters secure space shuttle Endeavour to its mobile launcher platform at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Bathed in xenon lights, space shuttle Endeavour moves along the crawlerway from the Vehicle Assembly Building to Launch Pad 39A, illuminated in the background, at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Terry Zaperach

CAPE CANAVERAL, Fla. -- Bathed in xenon lights, space shuttle Endeavour makes its nighttime journey from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- The orbiter access arm swings into position toward space shuttle Endeavour at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Roberto Vittori, with the European Space Agency, signs the space shuttle wall tribute in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Kennedy employees who have supported the Space Shuttle Program throughout the last 30 years have been signing the wall as a tribute to the program. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Endeavour is targeted to launch April 19 at 7:48 p.m. EDT on its final spaceflight mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour, secured on its mobile launcher platform, pulls away from the Vehicle Assembly Building for its nighttime journey to Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- STS-134 Commander Mark Kelly signs the space shuttle wall tribute in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Kennedy employees who have supported the Space Shuttle Program throughout the last 30 years have been signing the wall as a tribute to the program. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Endeavour is targeted to launch April 19 at 7:48 p.m. EDT on its final spaceflight mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour's mobile launcher platform sits over the flame trench at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Early morning finds space shuttle Endeavour has moved into place beside the rotating and fixed service structures on Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- The sun glints off space shuttle Endeavour following its arrival at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- The orbiter access arm swings into position against space shuttle Endeavour following its arrival at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour is positioned over the flame trench at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Bathed in xenon lights, space shuttle Endeavour moves along the crawlerway from the Vehicle Assembly Building to Launch Pad 39A, illuminated in the background, at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Andrew Feustel signs the space shuttle wall tribute in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Kennedy employees who have supported the Space Shuttle Program throughout the last 30 years have been signing the wall as a tribute to the program. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Endeavour is targeted to launch April 19 at 7:48 p.m. EDT on its final spaceflight mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Processing of space shuttle Endeavour at Launch Pad 39A at NASA's Kennedy Space Center in Florida is under way as morning breaks. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at the Vehicle Assembly Building at 7:56 p.m. EST March 10 and ended at 3:49 a.m. EST, nearly eight hours later. This is Endeavour's final scheduled rollout. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Greg Chamitoff signs the space shuttle wall tribute in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Kennedy employees who have supported the Space Shuttle Program throughout the last 30 years have been signing the wall as a tribute to the program. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Endeavour is targeted to launch April 19 at 7:48 p.m. EDT on its final spaceflight mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Space shuttle Endeavour moves through a high bay door of the Vehicle Assembly Building to begin its nighttime journey to Launch Pad 39A at NASA's Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour's 3.4-mile trek, known as "rollout," began at 7:56 p.m. EST and will take about seven hours to complete. This is the final scheduled rollout for Endeavour. Endeavour and its six-member crew 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 on the shuttle's final spaceflight, STS-134. Launch is targeted for 7:48 p.m. EDT April 19. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Terry Zaperach

CAPE CANAVERAL, Fla. -- This is a 3-D image of the crawler-transporter as it slowly hauls space shuttle Endeavour from the Vehicle Assembly Building to Launch Pad 39A at NASA’s Kennedy Space Center in Florida. The gigantic tracked mover weighs about 18 million pounds with the space shuttle, two solid rocket boosters, external fuel tank and mobile launcher platform attached. It takes six to eight hours to complete the 3.4-mile trip along crushed Alabama river rock at a speed of about 1 mph. To view this image, use green and magenta 3-D glasses. Endeavour and its six-member STS-134 crew 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. Endeavour's final launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- This is a 3-D image of the crawler-transporter as it slowly hauls space shuttle Endeavour from the Vehicle Assembly Building to Launch Pad 39A at NASA’s Kennedy Space Center in Florida. The gigantic tracked mover weighs about 18 million pounds with the space shuttle, two solid rocket boosters, external fuel tank and mobile launcher platform attached. It takes six to eight hours to complete the 3.4-mile trip along crushed Alabama river rock at a speed of about 1 mph. To view this image, use green and magenta 3-D glasses. Endeavour and its six-member STS-134 crew 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. Endeavour's final launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin