NASA astronauts Rick Mastracchio and Michael Hopkins are several hours into the first of three spacewalks intended to repair the International Space Station's malfunctioning coolant system. On December 11th, one of the station's two coolant loops unexpectedly shut down; soon after, astronauts turned off some nonessential equipment in an effort to reduce power load. NASA says that none of the six ISS crew members are in any immediate danger, but the space agency still wants the problem fixed to avoid any other sudden failures. The live feed of the spacewalk can be viewed below.
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