(AP Photo/John Raoux) Space shuttle Atlantis on pad 39A, left, and space shuttle Endeavour on pad 39B stand ready at Kennedy Space Center in Cape Canaveral, Fla., Saturday, Sept. 20, 2008. Atlantis is targeted for an Oct. 10 launch on a mission to service the Hubble Space Telescope. Endeavour will be on standby in the unlikely event that a rescue mission for the Atlantis's crew would be necessary. After Endeavour is cleared from its duty as a rescue vehicle, workers will move it to pad 39A in preparation for a mission to the International Space Station on Nov. 12.