Last updated on April 25, 2014 at 1:22 EDT
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September 14, 2011
Backdropped by the blackness of space and Earth's horizon, the Space Shuttle Endeavour, docked to the Pressurized Mating Adapter (PMA-2) on the International Space Station, is featured in this photograph taken by a crewmember during the mission's first planned session of extravehicular activity (EVA).