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Space shuttle Discovery

SpaceMark KellyKennedy Space CenterNASAGabrielle Giffords
In this handout picture from NASA on Saturday May 31, 2008, commander Mark Kelly is seen at the Kennedy Space Center, Fla., Saturday, May 31, 2008. Space shuttle Discovery is scheduled to lift off Saturday afternoon with seven crew members on a mission to the International Space Station. His... AP photo by Kim Shiflett