17-04-09 Rescue shuttle moved to launch pad just in case

Space shuttle Endeavour is on a launch pad,ready to rocket off on a rescue mission if shuttle Atlantis needs help when it flies to repair the Hubble Space Telescope next month.Endeavour rolled out early Friday to a launch pad at the Kennedy Space Center and is on standby in case the astronauts on Atlantis need a safe ride home.Atlantis is on a separate launch pad less than two miles away.Ever since space shuttles resumed flying following the 2003 Columbia tragedy that killed seven astronauts,NASA has had a rescue plan in case of irreparable damage.Most of those missions have been to the space station,though,where astronauts could camp out for two months.The Hubble mission doesn't offer a safe haven