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NASA's Space Shuttle "Endeavour" launch postponed at the Kennedy Space Center.

NASA's space shuttle "Endeavour" Commander Mark Kelly gives a "thumb's up" after departing the Operations and Checkout Building at the Kennedy Space Center on April 29, 2011. Kelly was scheduled to fly Endeavour on her twenty fifth and final mission; STS 134, to the International Space Station. Shortly after, NASA decided to postpone Endeavour's launch due to a faulty auxiliary power unit heater. NASA may perform a second attempt in 48 hours. UPI/Joe Marino, Bill Cantrell)

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