nhq2017070600121 (July 6, 2017) --- Expedition 52 flight engineer Paolo Nespoli of ESA participates in qualification exams with Expedition 52 flight engineers Randy Bresnik of NASA, and Alexander Misurkin of Roscosmos, Wednesday, July 5, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Beth Weissinger)

nhq2017070600119 (July 6, 2017) --- Expedition 52 flight engineer Randy Bresnik of NASA answers questions from the media as he and Paolo Nespoli of ESA, and Sergey Ryazanskiy of Roscosmos start their second to last day of qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Beth Weissinger)

nhq2017070600120 (July 6, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, Sergey Ryazanskiy of Roscosmos and Randy Bresnik of NASA are seen on monitors in a control room as they start their second to last day of qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Beth Weissinger)

nhq2017070600118 (July 6, 2017) --- Expedition 52 backup crew members: NASA astronaut Mark Vande Hei, left, and Russian cosmonaut Alexander Misurkin of Roscosmos are seen as they answer questions from the press outside the Soyuz simulator ahead of their Soyuz qualification exams with Expedition 52 backup crew member Japan Aerospace Exploration Agency (JAXA) astronaut Norishige Kanai, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Beth Weissinger)