Launching the end of the Shuttle Era

NASA completed a small step toward the transition of the Space Shuttle era to that of the Constellation rocket era: the handoff of launch pad 39B. While Atlantis was launched on pad 39A to service Hubble, Endeavour sat on 39B in case it was needed for a rescue mission. Endeavour was rolled to 39A on May 31, leaving behind 39B which will never be used to launch another Shuttle. Launch pads 39 A