NASA Spacewalk Livestream, Astronauts Perform Urgent Repairs: Watch Here

NASA astronauts Rick Mastracchio and Mike Hopkins spacewalk to perform repairs on the International Space Station Sunday, Dec. 21, 2013. NASA

NASA astronauts Rick Mastracchio and Mike Hopkins perform urgent repairs on the International Space Station. They went on a spacewalk Sunday. The astronauts have unhooked four fluid quick disconnects from the faulty ammonia pump module and they continue repairs, preparing to install a new unit.  

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