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In this still image taken from NASA TV,
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In this still image taken from NASA TV, International Space Station, astronauts Chris Cassidy takes photos as he works on repairs to the station. (May 11, 2013)(Credit: Getty Images)

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NASA astronauts plug leak during rare spacewalk

Astronauts making a rare, hastily planned spacewalk replaced a pump outside the International Space Station in hopes of plugging a serious ammonia leak.