Expedition 52 flight engineer Sergey Ryazanskiy of Roscosmos waits to enter the Soyuz simulator ahead his final Soyuz qualification exam with fellow Expedition 52 flight engineers Paolo Nespoli of ESA, and Randy Bresnik of NASA, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

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