Sergey Volkov

Sergey Aleksandrovich Volkov is a retired Russian cosmonaut and engineer. He was a member of three missions to the International Space Station, spending more than a year in total in space. During his missions he did four spacewalks lasting more than 23 hours in total. Volkov retired from the cosmonaut group in February 2017.

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รูปภาพ: NASA · Public domain