CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure around space shuttle Atlantis has been rolled back to enable delivery and transfer of Atlantis' payload on April 18. After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles now are poised on two different launch pads in full view. Near the top 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. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure around space shuttle Atlantis has been rolled back to enable delivery and transfer of Atlantis' payload on April 18. After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles now are poised on two different launch pads in full view. Near the top 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. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure around space shuttle Atlantis has been rolled back to enable delivery and transfer of Atlantis' payload on April 18. After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles now are poised on two different launch pads in full view. Near the top 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. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure around space shuttle Atlantis has been rolled back to enable delivery and transfer of Atlantis' payload on April 18. After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles now are poised on two different launch pads in full view. Near the top 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. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Atlantis is in full view after rollback of the rotating service structure. The rollback enables delivery and transfer of Atlantis' payload on April 18. After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles now are poised on two different launch pads in full view. Near the top 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. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Atlantis is in full view after rollback of the rotating service structure. The rollback enables delivery and transfer of Atlantis' payload on April 18. After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles now are poised on two different launch pads in full view. Near the top 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. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – From Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Atlantis roars into the sky on a column of fire on the STS-125 mission to service NASA's Hubble Space Telescope. Liftoff was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. –– In space shuttle Atlantis' payload bay at NASA Kennedy Space Center's Launch Pad 39A, STS-125 crew members take a final close look at the hardware for the Hubble servicing mission before the targeted May 11 launch. Atlantis' 11-day mission will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments. The payload bay holds four carriers of equipment that include the Wide Field Camera 3, Cosmic Origins Spectrograph, the Soft Capture Mechanism and replacement gyroscopes and batteries. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. –– In space shuttle Atlantis' payload bay at NASA Kennedy Space Center's Launch Pad 39A, STS-125 Mission Specialist Michael Good takes a final close look at the hardware for the Hubble servicing mission before the targeted May 11 launch. Atlantis' 11-day mission will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments. The payload bay holds four carriers of equipment that include the Wide Field Camera 3, Cosmic Origins Spectrograph, the Soft Capture Mechanism and replacement gyroscopes and batteries. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Creating an image of a century plant in bloom, space shuttle Atlantis trails a column of fire and smoke as it races into space on the STS-125 mission to service NASA's Hubble Space Telescope. Liftoff from Launch Pad 39A at NASA's Kennedy Space Center in Florida was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. – The launch of space shuttle Atlantis from Launch Pad 39A at NASA's Kennedy Space Center in Florida is viewed from behind Launch Pad 39B. On pad 39B is space shuttle Endeavour, which can launch, if needed, for rescue of Atlantis’ crew during its STS-125 mission to service NASA’s Hubble Space Telescope. Liftoff of Atlantis was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. – From Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Atlantis hurtles past the lightning mast into space on twin columns of fire on the STS-125 mission to service NASA's Hubble Space Telescope. Liftoff was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. – The launch of space shuttle Atlantis from Launch Pad 39A at NASA's Kennedy Space Center in Florida is viewed from behind Launch Pad 39B. On pad 39B is space shuttle Endeavour, which can launch, if needed, for rescue of Atlantis’ crew during its STS-125 mission to service NASA’s Hubble Space Telescope. Liftoff of Atlantis was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. –– In space shuttle Atlantis' payload bay at NASA Kennedy Space Center's Launch Pad 39A, STS-125 crew members take a final close look at the hardware for the Hubble servicing mission before the targeted May 11 launch. From left are Mission Specialist John Grunsfeld, Pilot Gregory C. Johnson and (kneeling) Mission Specialist Mike Massimino. Atlantis' 11-day mission will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments. The payload bay holds four carriers of equipment that include the Wide Field Camera 3, Cosmic Origins Spectrograph, the Soft Capture Mechanism and replacement gyroscopes and batteries. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Sandwiched by billowing clouds above and smoke and steam clouds below, space shuttle Atlantis hurtles past the lightning mast on top of the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida. Atlantis will rendezvous with NASA's Hubble Space Telescope on the STS-125 service mission. Liftoff was on-time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. –– In space shuttle Atlantis' payload bay at NASA Kennedy Space Center's Launch Pad 39A, STS-125 Mission Specialist Megan McArthur takes a final close look at the hardware for the Hubble servicing mission before the targeted May 11 launch. Atlantis' 11-day mission will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments. The payload bay holds four carriers of equipment that include the Wide Field Camera 3, Cosmic Origins Spectrograph, the Soft Capture Mechanism and replacement gyroscopes and batteries. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On twin towers of flame, space shuttle Atlantis roars into space from Launch Pad 39A at NASA's Kennedy Space Center in Florida on the STS-125 mission to service NASA's Hubble Space Telescope. Liftoff was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. – Clouds of smoke and steam billow across Launch Pad 39A at NASA's Kennedy Space Center in Florida as space shuttle Atlantis roars into space on the STS-125 mission to service NASA's Hubble Space Telescope. Liftoff was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. –Clouds of smoke and steam nearly obliterate Launch Pad 39A at NASA's Kennedy Space Center in Florida as space shuttle Atlantis roars into space on the STS-125 mission to service NASA's Hubble Space Telescope. Liftoff was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. – From Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Atlantis hurtles into space on twin columns of fire on the STS-125 mission to service NASA's Hubble Space Telescope. Liftoff was on time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. – Under a slow-building cloud bank, space shuttle Atlantis hurtles past the lightning mast on top of the fixed service structure on Launch Pad 39A at NASA's Kennedy Space Center in Florida. Atlantis will rendezvous with NASA's Hubble Space Telescope on the STS-125 service mission. Liftoff was on-time at 2:01 p.m. EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade the telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, Fine Guidance Sensor and the Cosmic Origins Spectrograph. Photo courtesy of Scott Andrews

CAPE CANAVERAL, Fla. – After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles are poised on two different launch pads. Shuttle Atlantis (left) already was on Launch Pad 39A. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during Atlantis' upcoming mission to upgrade NASA's Hubble Space Telescope. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles are poised on two different launch pads. Shuttle Atlantis (foreground) already was on Launch Pad 39A. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during Atlantis' upcoming mission to upgrade NASA's Hubble Space Telescope. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure around space shuttle Atlantis begins to open to enable delivery and transfer of Atlantis' payload on April 18. After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles now are poised on two different launch pads in full view. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles are poised on two different launch pads. Shuttle Atlantis (left) already was on Launch Pad 39A. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during Atlantis' upcoming mission to upgrade NASA's Hubble Space Telescope. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles are poised on two different launch pads. Shuttle Atlantis (right) already was on Launch Pad 39A. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during Atlantis' upcoming mission to upgrade NASA's Hubble Space Telescope. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles are poised on two different launch pads. Shuttle Atlantis (left) already was on Launch Pad 39A. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during Atlantis' upcoming mission to upgrade NASA's Hubble Space Telescope. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – After space shuttle Endeavour's rollout to Launch pad 39B at NASA's Kennedy Space Center in Florida this morning, two different shuttles are poised on two different launch pads. Shuttle Atlantis (foreground) already was on Launch Pad 39A. With the space shuttle fleet set for retirement in 2010, this is expected to be the final time two shuttles will be on launch pads at the same time. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during Atlantis' upcoming mission to upgrade NASA's Hubble Space Telescope. Atlantis is targeted to launch May 12. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for its STS-127 mission to the International Space Station. That flight is targeted for launch June 13. Photo credit: NASA/Dimitri Gerondidakis