CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank begins in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians will modify 32 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges where they attach to the thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- A technician measures the distance between space shuttle Discovery's external fuel tank and a computed radiography scanning device. The shuttle stack, consisting of the shuttle, external tank and solid rocket boosters, was moved from Launch Pad 39A to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. -- Inside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, a technician holds the film used to project computed radiography scans of space shuttle Discovery's external fuel tank. The shuttle stack was moved from Launch Pad 39A to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. -- A backscatter device continues to give engineers data on the intertank region of space shuttle Discovery's external fuel tank while it is in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Engineers at various NASA centers are analyzing, testing and imaging the intertank's support beams, called stringers, to make sure the tank is structurally sound for flight. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank begins in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians will modify 32 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges where they attach to the thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank continues in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians are modifying 94 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges. After the modifications of the stringers are complete, foam insulation will be re-applied to the tank. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is targeted for Feb. 24, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank begins in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians will modify 32 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges where they attach to the thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- A technician takes computed radiography scans of space shuttle Discovery's external fuel tank. The shuttle stack, consisting of the shuttle, external tank and solid rocket boosters, was moved from Launch Pad 39A to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. – As part of the repair work to space shuttle Discovery's external fuel tank, a technician measures a fitted piece of metal, called a radius block, which will be attached to an intertank support beam, called a stringer. Technicians in the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida are modifying 32 stringers with the radius blocks near the intertank’s thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank begins in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians will modify 32 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges where they attach to the thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- A technician prepares to monitor computed radiography scans of space shuttle Discovery's external fuel tank. The shuttle stack, consisting of the shuttle, external tank and solid rocket boosters, was moved from Launch Pad 39A to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank begins in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians will modify 32 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges where they attach to the thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank begins in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians will modify 32 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges where they attach to the thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank continues in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians are modifying 94 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges. After the modifications of the stringers are complete, foam insulation will be re-applied to the tank. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is targeted for Feb. 24, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery's external fuel tank is being prepared for computed radiography scans inside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. The shuttle stack, consisting of the shuttle, external tank and solid rocket boosters, was moved off Launch Pad 39A so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank continues in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians are modifying 94 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges. After the modifications of the stringers are complete, foam insulation will be re-applied to the tank. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is targeted for Feb. 24, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Inside the intertank of space shuttle Discovery's external fuel tank, a technician holds the film used to project computed radiography scans. The shuttle stack, consisting of the shuttle, external tank and solid rocket boosters, was moved from Launch Pad 39A to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. -- A backscatter device continues to give engineers data on the intertank region of space shuttle Discovery's external fuel tank while it is in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Engineers at various NASA centers are analyzing, testing and imaging the intertank's support beams, called stringers, to make sure the tank is structurally sound for flight. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank begins in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians will modify 32 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges where they attach to the thrust panel area. The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Repair work to space shuttle Discovery's external fuel tank continues in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Technicians are modifying 94 support beams, called stringers, on the tank's intertank region by fitting pieces of metal, called radius blocks, over the stringers' edges. After the modifications of the stringers are complete, foam insulation will be re-applied to the tank. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is targeted for Feb. 24, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- A technician exits the intertank of space shuttle Discovery's external fuel tank holding the film used to project computed radiography scans. The shuttle stack was moved from Launch Pad 39A to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. -- Space shuttle Discovery's external fuel tank is being prepared for computed radiography scans inside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. The shuttle stack, consisting of the shuttle, external tank and solid rocket boosters, was moved off Launch Pad 39A so technicians could examine 21-foot-long support beams, called stringers, on the outside of the tank's intertank and re-apply foam insulation. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is no earlier than Feb. 3, 2011. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frankie Martin
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery as it makes its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery as it makes its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jim Grossmann
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery as it makes its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery as it makes its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Outside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, Kennedy employees, and their families and friends, are on hand to watch space shuttle Discovery roll out to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, surrounds space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, begins to move into place around space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- A worker monitors space shuttle Discovery as it arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, begins to move into place around space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, moves into place around space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, begins to move into place around space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- NASA astronaut Terry Virts signs autographs outside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida while space shuttle Discovery rolls out to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Virts was pilot on the STS-130 mission that took the seven-windowed cupola to the International Space Station in 2010. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery and create a mirror image in the Turn Basin at NASA's Kennedy Space Center in Florida as the space vehicle rolls out to Launch Pad 39A from the Vehicle Assembly Building. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Outside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, Kennedy employees, and their families and friends, are on hand to watch space shuttle Discovery roll out to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Outside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, Kennedy employees, and their families and friends, are on hand to watch space shuttle Discovery roll out to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, begins to move into place around space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, moves into place around space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery as it makes its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jim Grossmann
CAPE CANAVERAL, Fla. -- Workers monitor space shuttle Discovery as it arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at the foot of Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jim Grossmann
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery as it makes its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Outside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, Kennedy employees, and their families and friends, are on hand to watch space shuttle Discovery roll out to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Space shuttle Discovery arrives at Launch Pad 39A from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. It took the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- The rotating service structure (RSS), which provides weather protection and access to the shuttle, moves into place around space shuttle Discovery on Launch Pad 39A at NASA's Kennedy Space Center in Florida. This comes after Discovery, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, rolled out to the pad from the Vehicle Assembly Building during the overnight hours. Rollout to the pad is a significant shuttle processing milestone for the upcoming STS-133 mission, and comes after a thorough check and modifications to the shuttle's external fuel tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller
CAPE CANAVERAL, Fla. -- Space shuttle Discovery slowly rolls out of the Vehicle Assembly Building and heads toward Launch Pad 39A at NASA's Kennedy Space Center in Florida. The slow trek, known as "rollout," will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform atop a crawler-transporter, about seven hours to complete. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jim Grossmann
CAPE CANAVERAL, Fla. -- NASA astronaut Terry Virts signs autographs outside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida while space shuttle Discovery rolls out to Launch Pad 39A. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Virts was pilot on the STS-130 mission that took the seven-windowed cupola to the International Space Station in 2010. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett
CAPE CANAVERAL, Fla. -- Xenon lights illuminate space shuttle Discovery as it makes its nighttime trek, known as "rollout," from the Vehicle Assembly Building to Launch Pad 39A at NASA's Kennedy Space Center in Florida. It will take the shuttle, attached to its external fuel tank, twin solid rocket boosters and mobile launcher platform, about seven hours to complete the move atop a crawler-transporter. This is the second time Discovery has rolled out to the pad for the STS-133 mission, and comes after a thorough check and modifications to the shuttle's external tank. Targeted to liftoff Feb. 24, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Kim Shiflett