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In this image taken from NASA video, NASA astronaut Chris Cassidy works outside the International Space Station on Thursday, July 16, 2020.  Cassidy and Bob Behnken ventured out on their third spacewalk over the past few weeks to remove six more old batteries in the space station’s power grid, and replace them with new, improved ones. (NASA via AP)

In this image taken from NASA video, NASA astronaut Chris Cassidy works outside the International Space Station on Thursday, July 16, 2020. Cassidy and Bob Behnken ventured out on their third spacewalk over the past few weeks to remove six more old batteries in the space station’s power grid, and replace them with new, improved ones. (NASA via AP)

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