At NASA's Kennedy Space Center monitors the progress of space shuttle Endeavour as it is lowered into high bay 1 of the Vehicle Assembly Building.

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