Final Four

The last space shuttle astronauts head into orbit.

The crew of STS-135, from right, Sandy Magnus, Doug Hurley, Chris Ferguson and Rex Walheim pose for a group photo as the space shuttle Atlantis is moved from the Orbiter Processing facility to the Vehicle Assembly Building at the Kennedy Space Center on Tuesday, May 17, 2011, in Florida. The move, known as rollover, is a milestone in the preparation for launch as the orbiter leaves its processing hangar to be prepped for its final flight. ( NASA Photo / Houston Chronicle, Smiley N. Pool ). (NASA Photo / Houston Chronicle,)

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