NASA International Space Station Expedition 51 Soyuz MS-04 mission prime crew members American astronaut Jack Fischer (left) and Russian cosmonaut Fyodor Yurchikhin of Roscosmos begin the pre-launch final crew qualification exams at the Gagarin Cosmonaut Training Center March 30, 2017 in Star City, Russia. (photo by Rob Navias /NASA via Planetpix)


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