Photo credit: NASA/Kim ShiflettShuttle Atlantis (right) is scheduled for a May 12 launch on its mission to upgrade NASA's Hubble Space Telescope (STS-125).
Shuttle Endeavour (left) is scheduled for a June 13 launch on its mission to the International Space Station (STS-127), but will first serve on the launch pad as a rescue spacecraft for Atlantis' Hubble mission.
Images above: Space shuttle Atlantis (left) and Endeavour stand on Launch Pads 39A and 39B at NASA's Kennedy Space Center in Florida. Image Credit: NASA