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Endeavour launch attempt scrubbed (17 images)

The countdown for shuttle Endeavour's final launch, attended by U.S. President Barack Obama and U.S. Rep. Gabrielle Giffords, was hitch free early Friday. The Endeavour mission will be the 134th in the program and the 25th for the spacecraft and the 36th shuttle mission to the space station.



As the Rotating Service Structure rolls back, NASA's space shuttle "Endeavour" stands on Launch Complex 39A at the Kennedy Space Center on April 28, 2011. As the countdown ticks toward her twenty fifth and final mission (STS 134), Endeavour will launch at apprximately 3:47 pm on April 29 and fly to the International Space Station with a crew of six. The primary payload is the two billion dollar Alpha Magnetic Spectrometer which is supported by 60 institutes in 16 countries. The payload will be attached to the exterior of the station to conduct multiple projects lasting throughout the life of the orbiting station. (UPI Photo / Joe Marino, Bill Cantrell
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As the Rotating Service Structure rolls back, NASA's space shuttle "Endeavour" stands on Launch Complex 39A at the Kennedy Space Center on April 28, 2011. As the countdown ticks toward her twenty fifth and final mission (STS 134), Endeavour will launch at apprximately 3:47 pm on April 29 and fly to the International Space Station with a crew of six. The primary payload is the two billion dollar Alpha Magnetic Spectrometer which is supported by 60 institutes in 16 countries. The payload will be attached to the exterior of the station to conduct multiple projects lasting throughout the life of the orbiting station. (UPI Photo / Joe Marino, Bill Cantrell
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As the Rotating Service Structure rolls back, NASA's space shuttle "Endeavour" stands on Launch Complex 39A at the Kennedy Space Center on April 28, 2011. As the countdown ticks toward her twenty fifth and final mission (STS 134), Endeavour will launch at apprximately 3:47 pm on April 29 and fly to the International Space Station with a crew of six. The primary payload is the two billion dollar Alpha Magnetic Spectrometer which is supported by 60 institutes in 16 countries. The payload will be attached to the exterior of the station to conduct multiple projects lasting throughout the life of the orbiting station. (UPI Photo / Joe Marino, Bill Cantrell
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As NASA's space shuttle program winds down, the orbiter "Discovery" undergoes processing to prepare it for its life in the post shuttle era. NASA engineers are placing the final touches on Discovery following its final mission, STS 133. NASA has decided to place Discovery on permanent exhibit at the Smithsonian National Air and Space Museum at Dulles Airport near Washington D.C. (UPI Photo / Joe Marino, Bill Cantrell)
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As the Rotating Service Structure rolls back, NASA's space shuttle "Endeavour" stands on Launch Complex 39A at the Kennedy Space Center on April 28, 2011. As the countdown ticks toward her twenty fifth and final mission (STS 134), Endeavour will launch at apprximately 3:47 pm on April 29 and fly to the International Space Station with a crew of six. The primary payload is the two billion dollar Alpha Magnetic Spectrometer which is supported by 60 institutes in 16 countries. The payload will be attached to the exterior of the station to conduct multiple projects lasting throughout the life of the orbiting station. (UPI Photo / Joe Marino, Bill Cantrell
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As the Rotating Service Structure rolls back, NASA's space shuttle "Endeavour" stands on Launch Complex 39A at the Kennedy Space Center on April 28, 2011. As the countdown ticks toward her twenty fifth and final mission (STS 134), Endeavour will launch at apprximately 3:47 pm on April 29 and fly to the International Space Station with a crew of six. The primary payload is the two billion dollar Alpha Magnetic Spectrometer which is supported by 60 institutes in 16 countries. The payload will be attached to the exterior of the station to conduct multiple projects lasting throughout the life of the orbiting station. (UPI Photo / Joe Marino, Bill Cantrell
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