NASA International Space Station Expedition 51 Soyuz MS-04 mission prime crew members Russian cosmonaut Fyodor Yurchikhin of Roscosmos (left) and American astronaut Jack Fischer answer questions from the media in front of a Soyuz spacecraft mockup during pre-launch final crew qualification exams at the Gagarin Cosmonaut Training Center March 31, 2017 in Star City, Russia. (photo by Rob Navias /NASA via Planetpix)

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Photo credit: © NASA Photo / Alamy / Afripics
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