Expedition 52 flight engineer Randy Bresnik of NASA salutes after laying roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Paolo Nespoli of ESA lays roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Randy Bresnik of NASA is seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 backup crew member Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) is seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

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)

nhq2017070600117 (July 6, 2017) --- Expedition 52 flight engineer Randy Bresnik of NASA demonstrates the width inside a Soyuz simulator, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, seated left, and Randy Bresnik of NASA are seen as they sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, seated left, and Randy Bresnik of NASA are seen as they sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 backup crew member Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) lays roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 backup crew member Mark Vande Hei of NASA is seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600116 (July 6, 2017) --- Expedition 52 flight engineer Randy Bresnik of NASA is seen inside a Soyuz simulator, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

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)

Expedition 52 flight engineer Sergey Ryazanskiy of Roscosmos is seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600109 (July 6, 2017) --- Expedition 52 flight engineer Paolo Nespoli of ESA answers questions from the media as he and \Randy Bresnik of NASA, 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/Bill Ingalls)

nhq201707070001 (July 7, 2017) --- A bulletin board outlines the Expedition 52 prime and backup crew members Soyuz qualification exams, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Randy Bresnik of NASA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600107 (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/Bill Ingalls)

Expedition 52 flight engineer Randy Bresnik of NASA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Randy Bresnik of NASA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070002 (July 7, 2017) --- Flags representing the United States, Russia, Italy, NASA, ESA, and the Roscosmos Gagarin Cosmonaut Training Center (GCTC) are seen on table during the Expedition 52 Soyuz qualification exams, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600108 (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/Bill Ingalls)

nhq201707070019 (July 7, 2017) --- Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, Randy Bresnik of NASA, and Paolo Nespoli of ESA are in the Soyuz simulator for their final Soyuz qualification exam, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, seated left, and Randy Bresnik of NASA are seen as they sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

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)

Expedition 52 flight engineer Sergey Ryazanskiy of Roscosmos answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600110 (July 6, 2017) --- Expedition 52 flight engineer Paolo Nespoli of ESA answers questions from the media as he and \Randy Bresnik of NASA, 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/Bill Ingalls)

Expedition 52 backup crew member Alexander Misurkin of Roscosmos is seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

A painting of Yuri Gagarin is seen in the lobby of the building where the Expedition 52 prime and backup crews held a crew press conference on the grounds of the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070008 (July 7, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, and Randy Bresnik of NASA answer questions from the press outside the Soyuz simulator ahead of their final Soyuz qualification exam, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600114 (July 6, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA are seen 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/Bill Ingalls)

nhq201707070013 (July 7, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, and Randy Bresnik of NASA pose for a photograph outside the Soyuz simulator ahead of their final Soyuz qualification exam, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Paolo Nespoli of ESA is seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070017 (July 7, 2017) --- Expedition 52 flight engineer Randy Bresnik of NASA is seen inside the Soyuz simulator during his final Soyuz qualification exam with fellow Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, and Paolo Nespoli of ESA, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600112 (July 6, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA are seen 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/Bill Ingalls)

nhq201707070005 (July 7, 2017) --- Expedition 52 flight engineers Randy Bresnik of NASA, left, Sergey Ryazanskiy of Roscosmos, center, and Paolo Nespoli of ESA prepare to answer questions from the press outside the Soyuz simulator ahead of their Soyuz qualification exams, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Paolo Nespoli of ESA signs a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

nhq201707070010 (July 7, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, and Randy Bresnik of NASA answer questions from the press outside the Soyuz simulator ahead of their final Soyuz qualification exam, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600101 (July 6, 2017) --- Expedition 52 backup crew members: Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA), left, Alexander Misurkin of Roscosmos, center, and Mark Vande Hei of NASA begin their Soyuz qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600115 (July 6, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA are seen 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/Bill Ingalls)

nhq201707070007 (July 7, 2017) --- Expedition 52 flight engineer Paolo Nespoli of ESA listens to questions from the press outside the Soyuz simulator ahead his final Soyuz qualification exam with fellow Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, 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)

nhq2017070600100 (July 6, 2017) --- Expedition 52 backup crew members: Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA), left, Alexander Misurkin of Roscosmos, center, and Mark Vande Hei of NASA begin their Soyuz qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600106 (July 6, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA are seen 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/Bill Ingalls)

Expedition 52 flight engineer Paolo Nespoli of ESA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Program for the Expedition 52 prime and backup crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 backup crew members Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA), left, Alexander Misurkin of Roscosmos, center, and Mark Vande Hei of NASA pose for a photograph in front of Saint Basil's Cathedral as they visited Red Square to lay roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)

nhq201707070011 (July 7, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, and Sergey Ryazanskiy of Roscosmos answer questions from the press outside the Soyuz simulator ahead of their final Soyuz qualification exam with fellow Expedition 52 flight engineer Randy Bresnik of NASA, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Paolo Nespoli of ESA is seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Expedition 52 flight engineer Randy Bresnik of NASA pose for group photograph at the conclusion of their crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070015 (July 7, 2017) --- 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)

Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA visit Red Square to lay roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600113 (July 6, 2017) --- Expedition 52 flight engineers Randy Bresnik of NASA, left, and Paolo Nespoli of ESA rollup their sleeves as they start their second to last day of qualification exams with Expedition 52 flight engineer Sergey Ryazanskiy of Roscosmos, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600103 (July 6, 2017) --- Expedition 52 backup crew members: Mark Vande Hei of NASA, left, Alexander Misurkin of Roscosmos, center, and Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) answer questions from the press outside the Soyuz simulator ahead of their Soyuz qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070009 (July 7, 2017) --- Expedition 52 flight engineer Randy Bresnik of NASA answers questions from the press outside the Soyuz simulator ahead his final Soyuz qualification exam with fellow Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, and Paolo Nespoli of ESA, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Randy Bresnik of NASA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC) as Expedition 52 flight engineers Paolo Nespoli of ESA, left, and Sergey Ryazanskiy of Roscosmos look on, Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070006 (July 7, 2017) --- Expedition 52 flight engineer Randy Bresnik of NASA listens to questions from the press outside the Soyuz simulator ahead his final Soyuz qualification exam with fellow Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, and Paolo Nespoli of ESA, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600105 (July 6, 2017) --- Expedition 52 backup crew member Alexander Misurkin of Roscosmos reviews his paperwork as he and Expedition 52 backup crew member Mark Vande Hei of NASA, background, and Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) start their Soyuz qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070016 (July 7, 2017) --- Expedition 52 crew members are seen on monitors in a control room as they participate in their Soyuz qualification exams, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070012 (July 7, 2017) --- Expedition 52 flight engineer Sergey Ryazanskiy of Roscosmos answers questions from the press outside 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)

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)

nhq2017070600104 (July 6, 2017) --- Expedition 52 backup crew members: Mark Vande Hei of NASA, left, Alexander Misurkin of Roscosmos, center, and Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) pose for a photograph outside the Soyuz simulator ahead of their Soyuz qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070014 (July 7, 2017) --- 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, background, 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)

nhq2017070600111 (July 6, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA are seen 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/Bill Ingalls)

nhq201707070003 (July 7, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, and Randy Bresnik of NASA prepare to don their Russian Sokol suits ahead of their final Soyuz qualification exam, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 backup crew members Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA), left, Alexander Misurkin of Roscosmos, center, and Mark Vande Hei of NASA lay roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Paolo Nespoli of ESA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Paolo Nespoli of ESA, seated left, Sergey Ryazanskiy of Roscosmos, seated center, Randy Bresnik of NASA, seated right, joined by backup crew members, Norishige Kanai, standing left, Alexander Misurkin, not pictured, and Mark Vande Hei, right, are seen as they sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA visit Red Square prepare to lay roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)

nhq2017070600102 (July 6, 2017) --- Expedition 52 backup crew members: Mark Vande Hei of NASA, suited left, Alexander Misurkin of Roscosmos, center, and Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) meet with, Cosmonaut Yuri Gidzenko, left, Cosmonaut Yuri Malenchenko, Deputy Director, GCTC, Cosmonaut Alexander Kaleri, and John McBrine, NASA Director of Operations, GCTC ahead of the crew's Soyuz qualification exams, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 prime and backup crews: Paolo Nespoli of ESA, left, Randy Bresnik of NASA, Sergey Ryazanskiy of Roscosmos, Alexander Misurkin of Roscosmos, Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA) and, Mark Vande Hei of NASA pose for group photograph at the conclusion of their crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 prime and backup crews are seen during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 backup crew members, Norishige Kanai, seated left, Alexander Misurkin, and Mark Vande Hei, seated right, sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC) as Expedition 52 flight engineers Paolo Nespoli of ESA, standing left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA, look on, Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 prime and backup crews arrive to tour the Gagarin Cosmonaut Training Center (GCTC) museum, Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

nhq201707070004 (July 7, 2017) --- Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Randy Bresnik of NASA meet with, Cosmonaut Yuri Gidzenko, left, Cosmonaut Yuri Malenchenko, Deputy Director, GCTC, Cosmonaut Alexander Kaleri, John McBrine, NASA Director of Operations, GCTC and Mark Bowman, NASA Soyuz Technical Lead ahead of the crew's final Soyuz qualification exam, Friday, July 7, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Paolo Nespoli of ESA, left, Randy Bresnik of NASA, Sergey Ryazanskiy of Roscosmos, and backup crew members, Alexander Misurkin of Roscosmos, Mark Vande Hei of NASA, and Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA), right, pose for a group photograph in Red Square after having laid roses at the site where Russian space icons are interred as part of traditional pre-launch ceremonies, Monday, July 10, 2017 in Moscow. Photo Credit: (NASA/Bill Ingalls)