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This photo provided by NASA shows astronauts Bob Behnken and Chris Cassidy on a spacewalk outside of the International Space Station on Tuesday, July 21, 2020. The astronauts are on their fourth and final spacewalk in under a month and instead of swapping batteries, they'll be routing cables and hooking up a tool storage chest. (NASA via AP)

This photo provided by NASA shows astronauts Bob Behnken and Chris Cassidy on a spacewalk outside of the International Space Station on Tuesday, July 21, 2020. The astronauts are on their fourth and final spacewalk in under a month and instead of swapping batteries, they'll be routing cables and hooking up a tool storage chest. (NASA via AP)

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