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April 24, 2014

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In this image made from video provided by NASA, astronaut Rick Mastracchio performs a space walk outside the International Space Station on Saturday, Dec. 21, 2013. Mastracchio and Michael Hopkins ventured out of the station to try to revive a crippled cooling line.

NASA

In this image made from video provided by NASA, astronaut Rick Mastracchio performs a space walk outside the International Space Station on Saturday, Dec. 21, 2013. Mastracchio and Michael Hopkins ventured out of the station to try to revive a crippled cooling line.