iss063e052528 (July 21, 2020) --- The sun beams just above the Earth's horizon as NASA astronaut and Expedition 63 Commander Chris Cassidy (center left) conducts his fourth spacewalk this year at the International Space Station. Cassidy has completed 10 spacewalks throughout his career for a total of 54 hours and 51 minutes spacewalking time.

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Photo credit: © NASA/piemags / Alamy / Afripics
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