Two astronauts floated outside the International Space Station on Friday for a six-hour spacewalk to replace aging batteries for the laboratory's solar power system, an upgrade needed to keep the outpost running into the next decade, NASA said.
U.S. astronaut Shane Kimbrough left the station's airlock at about 6:30 a.m. EST...
Astronauts upgrade station power system in six-hour spacewalk
January 14, 2017
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