Space shuttle Discovery heads home to retirement

NASA Administrator Charles Bolden speaks to employees and guests prior to announcing the final destinations of the three remaining space shuttles at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, April 12, 2011.(AP Photo/John Raoux)

NASA Administrator Charles Bolden speaks to employees and guests prior to announcing the final destinations of the three remaining space shuttles at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, April 12, 2011.(AP Photo/John Raoux)

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