Second Spacewalk Begins to Replace Degraded Pump on ISS - Presented by: The Aol. On Network

Astronauts aboard the International Space Station are conducting a second and final spacewalk to fix the outpost's cooling system early on Tuesday (December 24), a NASA official said. NASA astronauts Rick Mastracchio and Mike Hopkins left the station's Quest airlock on to install a new ammonia pump at 6:53 a.m. EST., according to NASA.



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