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iss063e034124 (July 1, 2020) --- NASA astronaut and Expedition 63 Flight Engineer Bob Behnken (center) works during a six-hour and one-minute spacewalk to swap an aging nickel-hydrogen battery for a new lithium-ion battery on the International Space Station's Starboard-6 truss structure. Protruding diagonally towards the upper left are the station's main solar arrays which are the length of basketball court.
