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The space shuttle Discovery is seen with Earth in the background as the shuttle approaches the International Space Station for docking in this February 26, 2011 photograph by an Expedition 26 crew member released by NASA. Shuttle Discovery astronauts worked alongside the International Space Station crew on Sunday to prepare the orbital outpost for life after the United States retires its three existing spaceships. Picture taken February 26, 2011. (Photo by Reuters/NASA)
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