CAPE CANAVERAL, Fla. – Space shuttle Atlantis' external fuel tank-solid rocket booster stack, atop a mobile launcher platform, rolls away from the Vehicle Assembly Building at NASA's Kennedy Space Center. It is being moved from high bay 1 to high bay 3 to make room for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– The payload canister with the Hubble Space Telescope equipment leaves the Vertical Processing Facility at NASA's Kennedy Space Center in Florida. The canister will deliver the hardware to Launch Pad 39A for transfer to space shuttle Atlantis' payload bay. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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. – Space shuttle Atlantis' external fuel tank-solid rocket booster stack, atop a mobile launcher platform, presents an unusual sight – without the shuttle – as it is transferred from high bay 1 to high bay 3 in the Vehicle Assembly Building at NASA's Kennedy Space Center. It is being moved to high bay 3 to make room for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Atlantis' external fuel tank-solid rocket booster stack, atop a mobile launcher platform, rolls through the doors of the Vehicle Assembly Building at NASA's Kennedy Space Center into high bay 3. The ET/SRB stack was moved from high bay 1 to make room for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– At NASA's Kennedy Space Center in Florida, the payload canister with the Hubble Space Telescope equipment travels in the dark as it heads for Launch Pad 39A, at left. On the pad, the Hubble equipment will be transferred to space shuttle Atlantis' payload bay. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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 Launch Pad 39A at NASA's Kennedy Space Center in Florida, the payload canister is lifted toward the payload changeout room, or PCR, on the rotating service structure. The canister's cargo of Hubble Space Telescope equipment will be deposited in the PCR and later transferred to the payload bay on space shuttle Atlantis, at right. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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. –– At NASA's Kennedy Space Center in Florida, the payload canister with the Hubble Space Telescope equipment heads for Launch Pad 39A. On the pad, the Hubble equipment will be transferred to space shuttle Atlantis' payload bay. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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. –– At NASA's Kennedy Space Center in Florida, the payload canister with the Hubble Space Telescope equipment heads for Launch Pad 39A. In the foreground, a bobcat runs across the road. On the pad, the Hubble equipment will be transferred to space shuttle Atlantis' payload bay. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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. –– Space shuttle Atlantis on Launch Pad 39A is viewed across the lagoon at NASA's Kennedy Space Center in Florida. Atlantis is targeted to launch May 12 on the STS-125 mission to upgrade NASA's Hubble Space Telescope. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – The doors of the Vehicle Assembly Building at NASA's Kennedy Space Center open to reveal space shuttle Atlantis' external fuel tank-solid rocket booster stack in high bay 1. The stack on the mobile launcher platform will be moved to high bay 3 to make room for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – After moving out of high bay 1 in the Vehicle Assembly Building at NASA's Kennedy Space Center, space shuttle Atlantis' external fuel tank-solid rocket booster stack, atop a mobile launcher platform, rolls into high bay 3. The move makes room in high bay 1 for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – After moving out of high bay 1 in the Vehicle Assembly Building at NASA's Kennedy Space Center, space shuttle Atlantis' external fuel tank-solid rocket booster stack, atop a mobile launcher platform, rolls toward high bay 3. The move makes room in high bay 1 for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Viewed from the shoreline at NASA's Kennedy Space Center in Florida, space shuttles Atlantis (left) and Endeavour (right) are seen on Launch Pad 39A and 39B respectively. 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. –– At NASA's Kennedy Space Center in Florida, the payload canister with the Hubble Space Telescope equipment passes the Vehicle Assembly Building and Launch Control Center (left) as it heads for Launch Pad 39A. On the pad, the Hubble equipment will be transferred to space shuttle Atlantis' payload bay. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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. –– – Lights covering the fixed service structure on Launch Pad 39A cast their glow over space shuttle Atlantis. The shuttle waits the arrival of the payload canister with its cargo of Hubble Space Telescope equipment. The payload will be transferred into Atlantis' payload bay. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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 Launch Pad 39A at NASA's Kennedy Space Center in Florida, the payload canister is lifted toward the payload changeout room, or PCR, on the rotating service structure. The red umbilical lines are still attached. The canister's cargo of Hubble Space Telescope equipment will be deposited in the PCR and later transferred to the payload bay on space shuttle Atlantis, at right. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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. –– At NASA's Kennedy Space Center in Florida, the payload canister(right) with the Hubble Space Telescope equipment arrives at the base of Launch Pad 39A. On the pad, the Hubble equipment will be transferred to space shuttle Atlantis' payload bay. Atlantis' 11-day STS-125 mission to service Hubble is targeted for launch May 12. The flight will include five spacewalks in which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. 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. –– Viewed across the lagoon at NASA's Kennedy Space Center in Florida, space shuttles Atlantis (right) and Endeavour (background left) are seen on Launch Pad 39A and 39B respectively. 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. – The doors of the Vehicle Assembly Building at NASA's Kennedy Space Center open to reveal space shuttle Atlantis' external fuel tank-solid rocket booster stack in high bay 1. The stack on the mobile launcher platform will be moved to high bay 3 to make room for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Atlantis' external fuel tank-solid rocket booster stack, atop a mobile launcher platform, presents an unusual sight – without the shuttle – as it is transferred from high bay 1 to high bay 3 in the Vehicle Assembly Building at NASA's Kennedy Space Center. It is being moved to high bay 3 to make room for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Atlantis' external fuel tank-solid rocket booster stack, atop a mobile launcher platform, has been rolled out of high bay 1 in the Vehicle Assembly Building at NASA's Kennedy Space Center. It is being moved to high bay 3 to make room for the ET-SRB stack for space shuttle Endeavour. Atlantis is targeted for launch on the STS-125 mission on May 12 to service NASA's Hubble Space Telescope. Endeavour will fly on the STS-127 mission to the International Space Station and bring the final segments for Japan's Kibo laboratory. Photo credit: NASA/Tim Jacobs

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. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Commander Scott Altman examines the cockpit window on space shuttle Atlantis. The inspection is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Mission Specialist Michael Good checks out part of the equipment in space shuttle Atlantis' payload bay. Equipment familiarization is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. 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. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Commander Scott Altman examines the cockpit window on space shuttle Atlantis, checking for sharp edges. The inspection is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. Photo credit: NASA/Kim Shiflett

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 the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 crew members are lowered into space shuttle Atlantis' payload bay for a close look at the hardware. Equipment familiarization is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Crew members are Commander Scott Altman, Pilot Gregory C. Johnson, and Mission Specialists Michael Good, Megan McArthur, John Grunsfeld, Mike Massimino and Andrew Feustel. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. Photo credit: NASA/Kim Shiflett

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 the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 crew members are lowered into space shuttle Atlantis' payload bay for a close look at the hardware. Equipment familiarization is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Crew members are Commander Scott Altman, Pilot Gregory C. Johnson, and Mission Specialists Michael Good, Megan McArthur, John Grunsfeld, Mike Massimino (reaching toward the airlock) and Andrew Feustel. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 crew members are lowered into space shuttle Atlantis' payload bay for a close look at the hardware. Equipment familiarization is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Crew members are Commander Scott Altman, Pilot Gregory C. Johnson, and Mission Specialists Michael Good, Megan McArthur, John Grunsfeld, Mike Massimino and Andrew Feustel. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. 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 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. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Mission Specialists Mike Massimino (center) and Michael Good (right) check out equipment in space shuttle Atlantis' payload bay. Equipment familiarization is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. 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. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Mission Specialists Mike Massimino (left) and Michael Good (right) check out the orbiter boom sensor system and the attached camera in space shuttle Atlantis' payload bay. Equipment familiarization is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. Photo credit: NASA/Kim Shiflett

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. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Pilot Gregory C. Johnson examines the cockpit window on space shuttle Atlantis, checking for sharp edges. The inspection is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. Photo credit: NASA/Kim Shiflett

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. – In the Orbiter Processing Facility at NASA's Kennedy Space Center, STS-125 Pilot Gregory C. Johnson examines the cockpit window on space shuttle Atlantis, checking for sharp edges. The inspection is part of the crew equipment interface test, which provides hands-on experience with hardware and equipment for the mission. Atlantis is targeted to launch Oct. 8 on the STS-125 mission to service the Hubble Space Telescope. The mission crew will perform history-making, on-orbit “surgery” on two important science instruments aboard the telescope. After capturing the telescope, two teams of spacewalking astronauts will perform the repairs during five planned spacewalks. Photo credit: NASA/Kim Shiflett

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. –– Space shuttle Atlantis atop the mobile launcher platform straddles the flame trench on Launch Pad 39A at NASA's Kennedy Space Center in Florida. It is joined by space shuttle Endeavour on Launch Pad 39B. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Dawn rises over the Atlantic Ocean behind space shuttle Endeavour on Launch Pad 39B at NASA's Kennedy Space Center in Florida. Surrounding the pad are the lightning towers erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. Endeavour has joined space shuttle Atlantis, which is on pad 39A. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Sunlight spotlights space shuttle Atlantis (left) and space shuttle Endeavour on Launch Pads 39A and 39B, respectively, at NASA's Kennedy Space Center in Florida. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Launch Pads 39A and 39B at NASA's Kennedy Space Center in Florida are ablaze with lights before dawn, showing shuttles on both pads. At left is space shuttle Atlantis, poised for the STS-125 mission targeted to launch May 12, and at right is space shuttle Endeavour. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following Atlantis' launch. 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/Chris Rhodes

CAPE CANAVERAL, Fla. –– On Launch Pad 39B (left) at NASA's Kennedy Space Center in Florida, space shuttle Endeavour has joined space shuttle Atlantis on Launch Pad 39A. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– On Launch Pad 39B (left) at NASA's Kennedy Space Center in Florida, space shuttle Endeavour has joined space shuttle Atlantis on Launch Pad 39A (right). This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. Surrounding pad 39B are the 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– At NASA's Kennedy Space Center in Florida, space shuttles Atlantis (left) and Endeavour (right) are seen on Launch Pad 39A and 39B respectively. 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. –– Space shuttle Endeavour is silhouetted against the dawn pink sky on Launch Pad 39B at NASA's Kennedy Space Center in Florida. Surrounding the pad are the lightning towers erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. Dotting the still dark sky at upper right is the moon. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch May 12 on the STS-125 mission to upgrade 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. –– Early morning light falls on space shuttle Endeavour on Launch Pad 39B at NASA's Kennedy Space Center in Florida. It joins space shuttle Atlantis on Launch Pad 39A. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Dawn breaks over the Atlantic Ocean behind space shuttle Atlantis on Launch Pad 39A at NASA's Kennedy Space Center in Florida. Atlantis is targeted to launch May 12 on its STS-125 mission. Space shuttle Endeavour sits on Launch Pad 39B, probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– On Launch Pad 39B at NASA's Kennedy Space Center in Florida, space shuttle Endeavour has joined space shuttle Atlantis on Launch Pad 39A. In the background is the Atlantic Ocean. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Space shuttle Endeavour is silhouetted against the dawn pink sky on Launch Pad 39B at NASA's Kennedy Space Center in Florida. Surrounding the pad are the lightning towers erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. Dotting the dark blue sky at upper right is the moon. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following space shuttle Atlantis' launch May 12 on the STS-125 mission to upgrade 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 Atlantis atop the mobile launcher platform straddles the flame trench on Launch Pad 39A at NASA's Kennedy Space Center in Florida. Behind it is the Atlantic Ocean. Atlantis has been joined by space shuttle Endeavour on Launch Pad 39B. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Sunlight spotlights space shuttle Atlantis (left) and space shuttle Endeavour on Launch Pads 39A and 39B, respectively, at NASA's Kennedy Space Center in Florida. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Viewed across the lagoon at NASA's Kennedy Space Center in Florida, space shuttle Endeavour is poised on Launch Pad 39B. Surrounding the pad are the 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 May 12 on the STS-125 mission to upgrade 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. –– Under a dawn sky, space shuttle Endeavour is still bathed in light from the fixed service structure. Endeavour joins Atlantis, which is on Launch Pad 39A at NASA's Kennedy Space Center in Florida. The towers around the launch pad were erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. 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 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Space shuttle Atlantis (left) and space shuttle Endeavour are seen on Launch Pads 39A and 39B, respectively, at NASA's Kennedy Space Center in Florida. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. Surrounding the pad are the 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Early dawn showcases Launch Pads 39A and 39B at NASA's Kennedy Space Center in Florida with shuttles on both pads. At left is space shuttle Atlantis, poised for the STS-125 mission targeted to launch May 12, and at right is space shuttle Endeavour. Endeavour will be prepared on the pad for liftoff in the unlikely event that a rescue mission is necessary following Atlantis' launch. 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/Chris Rhodes

CAPE CANAVERAL, Fla. –– Space shuttle Atlantis atop the mobile launcher platform sits on Launch Pad 39A at NASA's Kennedy Space Center in Florida. At left is the Vehicle Assembly Building. Atlantis has been joined by space shuttle Endeavour on Launch Pad 39B. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Space shuttle Atlantis (left) and space shuttle Endeavour are seen on Launch Pads 39A and 39B, respectively, at NASA's Kennedy Space Center in Florida. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. Surrounding pad 39B are the 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Space shuttle Endeavour (left) and space shuttle Atlantis are seen on Launch Pads 39B and 39A, respectively, at NASA's Kennedy Space Center in Florida. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– On Launch Pad 39B at NASA's Kennedy Space Center in Florida, space shuttle Endeavour has joined space shuttle Atlantis on Launch Pad 39A. In the background is the Atlantic Ocean. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– As dawn begins to brighten the sky over Launch Pad 39B at NASA's Kennedy Space Center in Florida, space shuttle Endeavour is seen bathed in lights from the fixed service structure. Endeavour joins Atlantis, which is on Launch Pad 39A. The towers around the launch pad were erected for NASA's Constellation Program, which will use the pad for Ares rocket launches. 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 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Space shuttle Endeavour (left) and space shuttle Atlantis are seen on Launch Pads 39B and 39A, respectively, at NASA's Kennedy Space Center. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010.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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– Space shuttle Atlantis (left) and space shuttle Endeavour are seen on Launch Pads 39A and 39B, respectively, at NASA's Kennedy Space Center in Florida. This is probably the final time two shuttles will be on launch pads at the same time with the space shuttle fleet set for retirement in 2010. Surrounding pad 39B are the 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. –– As dawn begins to brighten the sky over Launch Pad 39B at NASA's Kennedy Space Center in Florida, space shuttle Endeavour is seen bathed in lights from the fixed service structure. Endeavour joins Atlantis, which is 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 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/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Space shuttle Atlantis rolls into the transfer aisle of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. First motion was at 11:30 a.m. EDT. From the transfer aisle, Atlantis will be lifted into High Bay 3 and mated to the solid rocket booster-external fuel tank already installed on the mobile launcher platform. Atlantis is targeted to launch May 12 for the STS-125 Hubble servicing mission. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – On its transporter, space shuttle Atlantis rolls toward the Vehicle Assembly Building after leaving Orbiter Processing Facility 1 at NASA's Kennedy Space Center in Florida. First motion was at 11:30 a.m. EDT. In the VAB, Atlantis will be lifted into High Bay 3 and mated to the solid rocket booster-external fuel tank already installed on the mobile launcher platform.Atlantis is targeted to launch May 12 for the STS-125 Hubble servicing mission. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Atlantis is ready to move out of Orbiter Processing Facility 1 at NASA's Kennedy Space Center in Florida and roll over to the Vehicle Assembly Building. In the VAB, Atlantis will be lifted into High Bay 3 and mated to the solid rocket booster-external fuel tank already installed on the mobile launcher platform. Atlantis is targeted to launch May 12 for the STS-125 Hubble servicing mission. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – On its transporter, space shuttle Atlantis rolls toward the Vehicle Assembly Building (in the background) after leaving Orbiter Processing Facility 1 at NASA's Kennedy Space Center in Florida. First motion was at 11:30 a.m. EDT. In the VAB, Atlantis will be lifted into High Bay 3 and mated to the solid rocket booster-external fuel tank already installed on the mobile launcher platform. Atlantis is targeted to launch May 12 for the STS-125 Hubble servicing mission. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Atlantis rolls out of Orbiter Processing Facility 1 at NASA's Kennedy Space Center in Florida to roll over to the Vehicle Assembly Building. First motion was at 11:30 a.m. EDT. In the VAB, Atlantis will be lifted into High Bay 3 and mated to the solid rocket booster-external fuel tank already installed on the mobile launcher platform. Atlantis is targeted to launch May 12 for the STS-125 Hubble servicing mission. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Space shuttle Atlantis begins rolling out of Orbiter Processing Facility 1 at NASA's Kennedy Space Center in Florida to roll over to the Vehicle Assembly Building. First motion was at 11:30 a.m. EDT. In the VAB, Atlantis will be lifted into High Bay 3 and mated to the solid rocket booster-external fuel tank already installed on the mobile launcher platform. Atlantis is targeted to launch May 12 for the STS-125 Hubble servicing mission. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – On its transporter, space shuttle Atlantis rolls toward the open door of the Vehicle Assembly Building after leaving Orbiter Processing Facility 1 at NASA's Kennedy Space Center in Florida. First motion was at 11:30 a.m. EDT. In the VAB, Atlantis will be lifted into High Bay 3 and mated to the solid rocket booster-external fuel tank already installed on the mobile launcher platform. Atlantis is targeted to launch May 12 for the STS-125 Hubble servicing mission. Photo credit: NASA/Jack Pfaller

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

CAPE CANAVERAL, Fla. -- This orbiter tribute of space shuttle Atlantis, or OV-104, hangs in Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida. In the lower-left corner, it features Atlantis soaring above Earth and threaded through the design are the mission patches for each of Atlantis’ flights. Atlantis' accomplishments include seven missions to the Russian space station Mir and several assembly, construction and resupply missions to the International Space Station. Atlantis also flew the last Hubble Space Telescope servicing mission on STS-125. In the tribute, the planet Venus represents the Magellan probe being deployed during STS-30, and Jupiter represents the Galileo probe being deployed during STS-34. The inset photos illustrate various aspects of shuttle processing as well as significant achievements, such as the glass cockpit and the first shuttle docking with Mir during STS-71. The inset photo in the upper-left corner shows a rainbow over Atlantis on Launch Pad 39A and shuttle Endeavour on Launch Pad 39B at Kennedy. Endeavour was the assigned vehicle had Atlantis’ STS-125 mission needed rescue, and this was the last time both launch pads were occupied at the same time. The stars in the background represent the many people who have worked with Atlantis and their contributions to the vehicle’s success. Graphic design credit: NASA/Amy Lombardo

CAPE CANAVERAL, Fla. -- This is a printable version of space shuttle Atlantis' orbiter tribute, or OV-104, which hangs in Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida. In 2011, the tribute was updated to reflect the addition of one more flight -- STS-135 -- which will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. In the lower-left corner, it features Atlantis soaring above Earth and threaded through the design are the mission patches for each of Atlantis’ flights. Atlantis' accomplishments include seven missions to the Russian space station Mir and several assembly, construction and resupply missions to the International Space Station. Atlantis also flew the last Hubble Space Telescope servicing mission on STS-125. In the tribute, the planet Venus represents the Magellan probe being deployed during STS-30, and Jupiter represents the Galileo probe being deployed during STS-34. The inset photos illustrate various aspects of shuttle processing as well as significant achievements, such as the glass cockpit and the first shuttle docking with Mir during STS-71. The inset photo in the upper-left corner shows a rainbow over Atlantis on Launch Pad 39A and shuttle Endeavour on Launch Pad 39B at Kennedy. Endeavour was the assigned vehicle had Atlantis’ STS-125 mission needed rescue, and this was the last time both launch pads were occupied at the same time. The stars in the background represent the many people who have worked with Atlantis and their contributions to the vehicle’s success. Graphic design credit: NASA/Amy Lombardo. NASA publication number: SP-2010-08-161-KSC

CAPE CANAVERAL, Fla. -- This orbiter tribute of space shuttle Atlantis, or OV-104, hangs in Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida. In 2011, the tribute was updated to reflect the addition of one more Atlantis flight -- STS-135 -- which will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. In the lower-left corner, it features Atlantis soaring above Earth and threaded through the design are the mission patches for each of Atlantis’ flights. Atlantis' accomplishments include seven missions to the Russian space station Mir and several assembly, construction and resupply missions to the International Space Station. Atlantis also flew the last Hubble Space Telescope servicing mission on STS-125. In the tribute, the planet Venus represents the Magellan probe being deployed during STS-30, and Jupiter represents the Galileo probe being deployed during STS-34. The inset photos illustrate various aspects of shuttle processing as well as significant achievements, such as the glass cockpit and the first shuttle docking with Mir during STS-71. The inset photo in the upper-left corner shows a rainbow over Atlantis on Launch Pad 39A and shuttle Endeavour on Launch Pad 39B at Kennedy. Endeavour was the assigned vehicle had Atlantis’ STS-125 mission needed rescue, and this was the last time both launch pads were occupied at the same time. The stars in the background represent the many people who have worked with Atlantis and their contributions to the vehicle’s success. Graphic design credit: NASA/Amy Lombardo. NASA publication number: SP-2010-08-161-KSC

CAPE CANAVERAL, Fla. -- This is a version of space shuttle Atlantis' orbiter tribute, or OV-104, which hangs in Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida. In 2011, the tribute was updated to reflect the addition of one more Atlantis flight -- STS-135 -- which will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. In the lower-left corner, it features Atlantis soaring above Earth and threaded through the design are the mission patches for each of Atlantis’ flights. Atlantis' accomplishments include seven missions to the Russian space station Mir and several assembly, construction and resupply missions to the International Space Station. Atlantis also flew the last Hubble Space Telescope servicing mission on STS-125. In the tribute, the planet Venus represents the Magellan probe being deployed during STS-30, and Jupiter represents the Galileo probe being deployed during STS-34. The inset photos illustrate various aspects of shuttle processing as well as significant achievements, such as the glass cockpit and the first shuttle docking with Mir during STS-71. The inset photo in the upper-left corner shows a rainbow over Atlantis on Launch Pad 39A and shuttle Endeavour on Launch Pad 39B at Kennedy. Endeavour was the assigned vehicle had Atlantis’ STS-125 mission needed rescue, and this was the last time both launch pads were occupied at the same time. The stars in the background represent the many people who have worked with Atlantis and their contributions to the vehicle’s success. Graphic design credit: NASA/Amy Lombardo. NASA publication number: SP-2010-08-161-KSC

CAPE CANAVERAL, Fla. -- This is a version of space shuttle Atlantis' orbiter tribute, or OV-104, which hangs in Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida. In the lower-left corner, it features Atlantis soaring above Earth and threaded through the design are the mission patches for each of Atlantis’ flights. Atlantis' accomplishments include seven missions to the Russian space station Mir and several assembly, construction and resupply missions to the International Space Station. Atlantis also flew the last Hubble Space Telescope servicing mission on STS-125. In the tribute, the planet Venus represents the Magellan probe being deployed during STS-30, and Jupiter represents the Galileo probe being deployed during STS-34. The inset photos illustrate various aspects of shuttle processing as well as significant achievements, such as the glass cockpit and the first shuttle docking with Mir during STS-71. The inset photo in the upper-left corner shows a rainbow over Atlantis on Launch Pad 39A and shuttle Endeavour on Launch Pad 39B at Kennedy. Endeavour was the assigned vehicle had Atlantis’ STS-125 mission needed rescue, and this was the last time both launch pads were occupied at the same time. The stars in the background represent the many people who have worked with Atlantis and their contributions to the vehicle’s success. Graphic design credit: NASA/Amy Lombardo. NASA publication number: SP-2010-08-161-KSC

CAPE CANAVERAL, Fla. -- This is a printable version of space shuttle Atlantis' orbiter tribute, or OV-104, which hangs in Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida. In the lower-left corner, it features Atlantis soaring above Earth and threaded through the design are the mission patches for each of Atlantis’ flights. Atlantis' accomplishments include seven missions to the Russian space station Mir and several assembly, construction and resupply missions to the International Space Station. Atlantis also flew the last Hubble Space Telescope servicing mission on STS-125. In the tribute, the planet Venus represents the Magellan probe being deployed during STS-30, and Jupiter represents the Galileo probe being deployed during STS-34. The inset photos illustrate various aspects of shuttle processing as well as significant achievements, such as the glass cockpit and the first shuttle docking with Mir during STS-71. The inset photo in the upper-left corner shows a rainbow over Atlantis on Launch Pad 39A and shuttle Endeavour on Launch Pad 39B at Kennedy. Endeavour was the assigned vehicle had Atlantis’ STS-125 mission needed rescue, and this was the last time both launch pads were occupied at the same time. The stars in the background represent the many people who have worked with Atlantis and their contributions to the vehicle’s success. Graphic design credit: NASA/Amy Lombardo. NASA publication number: SP-2010-08-161-KSC