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This December 21, 2013 still image taken from NASA television, shows astronaut Rick Mastracchio working to fix a broken equipment cooling system on the International Space Station. Mastracchio and colleague Mike Hopkins are on the first of three urgent spacewalks called for due to a faulty valve that caused a partial shutdown in the system that regulates equipment temperature at the space station. == RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: “AFP PHOTO / NASA” – NO MARKETING / NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS ==