Space shuttle Endeavour moves out of the Vehicle Assembly Building for rollout to Launch Pad 39B at NASA's Kennedy Space Center in Florida.

Space shuttle Endeavour, installed on the mobile launcher platform atop the crawler-transporter, moves out of the Vehicle Assembly Building for rollout to Launch Pad 39B at NASA's Kennedy Space Center in Florida. First motion was at 11:57 p.m. EDT April 16. The 4.2-mile journey is expected to take approximately 7 hours. 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/Jack Pfaller