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iss059e006420 (March 29, 2019) --- NASA astronaut Christina Koch enters the Quest airlock moments before completing her first spacewalk to upgrade the International Space Station's power storage capacity. She and fellow spacewalker Nick Hague (out of frame) of NASA worked outside in the vacuum of space for six hours and 45 minutes to continue swapping batteries and install adapter plates on the station's Port-4 truss structure.
