September 20, 2008--The space shuttles Atlantis (foreground) and Endeavour stand atop a pair of launch pads at Florida's Kennedy Space Center.

Atlantis is scheduled to blast off October 10 on a mission to repair the Hubble Space Telescope.

Endeavour will stand by as an emergency rescue spacecraft, then launch its own mission to the International Space Station on November 12.

Two shuttles have not simultaneously occupied launch pads at Cape Canaveral since July 2001.

--Brian Handwerk