Space shuttle Endeavour on Launch Pad 39B is viewed from the air after the rollout at NASA's Kennedy Space Center.

Space shuttle Endeavour on Launch Pad 39B is viewed from the air after the rollout from the Vehicle Assembly Building at NASA's Kennedy Space Center. At left of the shuttle is the open rotating service structure and the fixed service structure with the 80-foot lightning mast on top. At right is the tower that holds 300,000 gallons of water used for sound suppression on the pad during liftoff. First motion out of the Vehicle Assembly Building was at 11:15 p.m. Sept. 18. In the background is the Banana River. Endeavour completed the 4.2-mile journey at 6:59 a.m. EDT. For the first time since July 2001, two shuttles are on the launch pads at the same time at the center. Endeavour will stand by at pad B in the unlikely event that a rescue mission is necessary during space shuttle Atlantis' upcoming mission to repair NASA's Hubble Space Telescope, targeted to launch Oct. 10. After Endeavour is cleared from its duty as a rescue spacecraft, it will be moved to Launch Pad 39A for the STS-126 mission to the International Space Station. That flight is targeted for launch Nov. 12. Photo credit: NASA/Troy Cryder