NASA Preps for Spacewalks to Fix Failed Valve on ISS - Presented by: The Aol. On Network

NASA is embarking on another spacewalk. This time, it's to fix a failed pump valve that regulates the International Space Station's coolant system. American flight engineers Rick Mastracchio and Mike Hopkins will be going on the first of three planned walks this Saturday. NASA recreated the spacewalks on Earth and sent a video to the station so the astronauts can get their own preview.



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