Space Shuttle Atlantis and Endeavour sit on their launch pads at Kennedy Space Center. - Bildbanksfoto

Cape Canaveral, Florida, September 20, 2008 - With a rainbow serving as a backdrop in the sky, space shuttle Atlantis (foreground) sits on Launch Pad A and Endeavour on Launch Pad B at NASA�s Kennedy Space Center in Florida. At the left of each shuttle are the open rotating service structures with the payload changeout rooms revealed. The rotating service structures provide protection for weather and access to the shuttle.