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In this frame grab from NASA Television, astronauts Scott Kelly and Kjell Lindgren perform maintenance outside the International Space Station, on Friday, Nov. 6, 2015.  Friday's excursion involves work on the space station's cooling system.  Kelly has been at the 250-mile-high outpost since March, and isn't due back until next March. Today marks his 224th day in orbit, a U.S. record.  (NASA via AP)
Associated Press | November 6, 2015 4:34 am
Spacewalkers encounter leaking ammonia, spoils radiator work