On July 24, 2009 astronauts C.Cassidy and T.Marshburn finished replacing batteries on the International Space Station’s oldest solar arrays during a 7-hour, 12-minute spacewalk – the fourth of five planned during space shuttle Endeavour’s STS-127 mission.
They installed four of six new batteries for the P6 Truss structure, where a pair of solar array wings collects sunlight for power generation. They stored four more of the old batteries onto a cargo carrier for return to Earth.
Inside the complex, Tim Kopra choreographed the activities. Mission specialists Koichi Wakata an
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