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In this Wednesday, April 23, 2014 image made from video provided by NASA, astronauts Rick Mastracchio and Steven Swanson exit an airlock from the International Space Station. The spacewalk was scheduled to replace a dead computer and get their orbiting home back up to full strength. (AP Photo/NASA)

In this Wednesday, April 23, 2014 image made from video provided by NASA, astronauts Rick Mastracchio and Steven Swanson exit an airlock from the International Space Station. The spacewalk was scheduled to replace a dead computer and get their orbiting home back up to full strength. (AP Photo/NASA)

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