Expedition 50 NASA astronaut Peggy Whitson smiles as she listens to a reporter's question ahead of the final qualification exams with fellow crew mates Russian cosmonaut Oleg Novitskiy of Roscosmos and ESA astronaut Thomas Pesquet, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 31 backup crew members Kevin Ford, Oleg Novitskiy and Evgeny Tarelkin stand at attention before senior officials for their final qualification test in preparation for flight, Monday, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Expedition 31 prime crew members commander Gennady Padalka, flight engineers Joe Acaba and Sergei Revin practiced similar scenarios nearby in advance of their final approval for launch to the International Space Station, scheduled for May 15, 2012. Photo Credit: (NASA/Carla Cioffi)

From left to right, Expedition 64 prime crew members, NASA astronaut Kate Rubins, Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos, and Russian cosmonaut Sergey Ryzhikov of Roscosmos, and Expedition 64 backup crew members Russian cosmonaut Oleg Novitskiy of Roscosmos, Russian cosmonaut Petr Dubrov of Roscosmos, and NASA astronaut Mark Vande Hei, are seen during a press conference prior to the prime team’s launch from Baikonur Cosmodrome, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Oleg Novitskiy of Roscosmos speaks during a press conference prior to his launch from the Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 backup crew member, Oleg Novitskiy of Roscosmos is seen at the conclusion of a press conference, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member Russian cosmonaut Oleg Artemyev of Roscosmos is seen during a press conference prior to the prime crew’s launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

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 50 NASA astronaut Peggy Whitson dons her Sokol suit ahead of her final qualification exams with fellow crew mates Russian cosmonaut Oleg Novitskiy of Roscosmos and ESA astronaut Thomas Pesquet, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 ESA astronaut Thomas Pesquet is seen inside the Soyuz simulator during final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Pesquet, Russian cosmonaut Oleg Novitskiy of Roscosmos, and NASA astronaut Peggy Whitson are scheduled to launch in November 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 64 crew members Sergey Ryzhikov of Roscosmos, left, and Sergey Kud-Sverchkov of Roscosmos are seen on monitors during the Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos wave during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 backup crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Petr Dubrov of Roscosmos meet with mission managers ahead of their Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

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)

Expedition 65 backup crew member, Anton Shkaplerov of Roscosmos signs in for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anne McClain of NASA, is seen during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anton Shkaplerov of Roscosmos signs in for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 backup crew member Oleg Novitskiy, foreground, and Kevin Ford head towards a Soyuz spacecraft mockup to conduct final simulation tests in preparation for flight, Monday, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Photo Credit: (NASA/Carla Cioffi)

Expedition 50 NASA astronaut Peggy Whitson dons her Sokol suit ahead of her final qualification exams with fellow crew mates Russian cosmonaut Oleg Novitskiy of Roscosmos and ESA astronaut Thomas Pesquet, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew member Russian cosmonaut Oleg Novitskiy of Roscosmos, signs in for Soyuz qualification exams while crew mates Mark Vande Hei of NASA, left, and Pyotr Dubrov of Roscosmos look on, Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

The Expedition 43 crew; NASA Astronaut Scott Kelly, left, Russian Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), center, and Russian Cosmonaut Gennady Padalka of Roscosmos, talk to press prior to departing the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia for Baikonur, Kazakhstan, Saturday, March 14, 2015. The trio is preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 31 backup crew members Kevin Ford (left), Oleg Novitskiy and Evgeny Tarelkin (right) are interviewed by the press before their final qualification test in preparation for flight, Monday, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Expedition 31 prime crew members commander Gennady Padalka, flight engineers Joe Acaba and Sergei Revin practiced similar scenarios nearby in advance of their final approval for launch to the International Space Station, scheduled for May 15, 2012. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 prime crew members, NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos, right, pose for a photo during an official farewell ceremony prior to their departure to Baikonur for launch from the Baikonur Cosmodrome, Friday, March 26, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew members NASA astronaut Kate Rubins, left, Russian cosmonaut Sergey Ryzhikov of Roscosmos, center, and Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos arrive for Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 64 backup crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Petr Dubrov of Roscosmos arrive for Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 64 crew members Sergey Ryzhikov of Roscosmos, left, Kate Rubins of NASA ,center, and Sergey Kud-Sverchkov of Roscosmos arrive for Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet report to mission managers for their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member Oleg Artemyev of Roscosmos is seen with crew mates NASA astronaut Anne McClain, left, and Anton Shkaplerov of Roscosmos during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Oleg Novitskiy of Roscosmos, signs in for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member Sergey Ryzhikov of Roscosmos signs in for Soyuz qualification exams as crew mate Sergey Kud-Sverchkov of Roscosmos looks on, Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 backup crew member Petr Dubrov of Roscosmos signs in for his Soyuz qualification exams as crew mates Mark Vande Hei of NASA, left, and Oleg Novitskiy of Roscosmos look on, Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 backup crew members Russian cosmonaut Oleg Artemyev of Roscosmos, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and NASA astronaut Anne McClain, pose for a photo during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Mark Vande Hei of NASA, is seen during Soyuz qualification exams Saturday, March 20, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 backup crew members, NASA astronaut Jack Fisher, left, Russian cosmonaut Fyodor Yurchikhin of Roscosmos, center, and ESA astronaut Paolo Nespoli, left, answer questions from the press ahead of their Soyuz qualification exams, Monday, Oct. 24, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member NASA astronaut Anne McClain signs in for Soyuz qualification exams while Russian cosmonaut Anton Shkaplerov of Roscosmos, left, and Russian cosmonaut Oleg Artemyev of Roscosmos look on, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

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)

From left to right, Expedition 64 prime crew members, NASA astronaut Kate Rubins, Russian cosmonaut Sergey Ryzhikov of Roscosmos, and Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos, pose for a photo at the conclusion of a press conference prior to their scheduled launch October 14 from the Baikonur Cosmodrome in Kazakhstan, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 prime crew member Oleg Novitskiy of Roscosmos, holds up a toy cat that will be used in the Soyuz capsule to help indicate the start of weightlessness after leaving the Earth’s atmosphere, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 backup crew member, Anne McClain of NASA signs in for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anne McClain of NASA is seen during Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Pyotr Dubrov of Roscosmos, is seen during Soyuz qualification exams Saturday, March 20, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Pyotr Dubrov of Roscosmos, center, and Russian cosmonaut Oleg Novitskiy of Roscosmos,wave during a press conference prior to their launch from the Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 backup crew member NASA astronaut Mark Vande Hei signs a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), as his crew mates watch, Thursday, Sept. 24, 2020 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/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anne McClain of NASA, is seen during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member Russian cosmonaut Anton Shkaplerov of Roscosmos waves during a press conference prior to the prime crew’s launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 backup crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Petr Dubrov of Roscosmos pose for a photo during qualification exams Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 49 Russian cosmonaut Sergei Ryzhikov of Roscosmos dons his Russian Sokol suit ahead of the Soyuz qualification exams with fellow Russian cosmonaut Andrey Borisenko of Roscosmos and NASA astronaut Shane Kimbrough, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos arrive for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 28 crew members, Flight Engineer Mike Fossum, left, Soyuz commander Sergei Volkov, center, and Flight Engineer Satoshi Furukawa, pose for a photograph on the grounds of the Gagarin Cosmonaut Training Center, Wednesday, May 25, 2011 in Star City, Russia. The crew later departed for Baikonur, Kazakhstan in preparation for their June launch onboard a Soyuz rocket. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 prime crew member Russian cosmonaut Pyotr Dubrov of Roscosmos is seen during a press conference prior to his launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 crew members ESA astronaut Thomas Pesquet, Russian cosmonaut Oleg Novitskiy of Roscosmos, and NASA astronaut Peggy Whitson are seen on the monitors of the Soyuz simulator control room during final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew members Russian cosmonaut Pyotr Dubrov of Roscosmos, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and NASA astronaut Mark Vande Hei, pose for a photo during qualification exams, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

The interior of the Soyuz simulator is seen as Expedition 49 NASA astronaut Shane Kimbrough, Russian cosmonauts Sergei Ryzhikov and Andrey Borisenko of Roscosmos take their Soyuz qualification exams, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew member Pyotr Dubrov of Roscosmos, is seen during Soyuz qualification exams Saturday, March 20, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member Sergey Kud-Sverchkov of Roscosmos signs in for Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 prime crew member Kate Rubins of NASA, is seen during a press conference prior to her launch from the Baikonur Cosmodrome in Kazakhstan, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 prime crew member Russian cosmonaut Oleg Novitskiy of Roscosmos waves during a press conference prior to his launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 ESA astronaut Thomas Pesquet dons his Sokol suit ahead of his final qualification exams with fellow crew mates NASA astronaut Peggy Whitson and Russian cosmonaut Oleg Novitskiy of Roscosmos, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member, Anne McClain of NASA signs in for Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (GCTC/Andrey Shelepin)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet report to mission managers for their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos meet with mission managers ahead of their Soyuz qualification exams, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

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 43 NASA Astronaut Scott Kelly, center, and Expedition 43 backup crew member NASA Astronaut Jeff Williams talk as Kelly’s girlfriend, Amiko Kauderer, looks on at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, Saturday, March 14, 2015. Kelly and fellow Expedition 43 crew members, Russian Cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) departed later in the morning for Baikonur, Kazakhstan. The trio is preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 backup crew members, NASA astronaut Jack Fisher, left, Russian cosmonaut Fyodor Yurchikhin of Roscosmos, center, and ESA astronaut Paolo Nespoli, left, answer questions from the press ahead of their Soyuz qualification exams, Monday, Oct. 24, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 43 backup crew members: Jeff Williams of NASA, left, Alexei Ovchinin and Sergei Volkov of of the Russian Federal Space Agency (Roscosmos), pose for a photograph with Expedition 43 prime crew members: NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of Roscosmos prior to departing the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, for Baikonur, Kazakhstan, Saturday, March 14, 2015. The Expedition 43 crew is preparing for their launch to the International Space Station in the Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 28 crew members, Flight Engineer Satoshi Furukawa, left, Soyuz commander Sergei Volkov, center, and Flight Engineer Mike Fossum, answer reporters questions during a crew departure press conference held on the grounds of the Gagarin Cosmonaut Training Center, Wednesday, May 25, 2011 in Star City, Russia. The crew later departed for Baikonur, Kazakhstan in preparation for their June launch onboard a Soyuz rocket. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

A bulletin board is seen with details about the qualification exams of the main and back-up crews for Expedition 50, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 49 crew members: NASA astronaut Shane Kimbrough, left, Russian cosmonaut Sergei Ryzhikov of Roscosmos, center, and Russian cosmonaut Andrey Borisenko of Roscosmos report to NASA and Roscosmos officials during their Soyuz qualification exams, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 49 Russian cosmonauts Sergei Ryzhikov, left, and Andrey Borisenko of Roscosmos answer questions from the press outside the Soyuz simulator ahead of their Soyuz qualification exams with NASA astronaut Shane Kimbrough, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 64 crew member NASA astronaut Kate Rubins signs in for Soyuz qualification exams as Russian cosmonaut Sergey Ryzhikov of Roscosmos, left, and Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos look on, Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 50 Russian cosmonaut Oleg Novitskiy of Roscosmos prepares to join ESA astronaut Thomas Pesquet, background, and NASA astronaut Peggy Whitson inside the Soyuz simulator for final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew members Russian cosmonaut Pyotr Dubrov of Roscosmos, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and NASA astronaut Mark Vande Hei, pose for a photo during qualification exams, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members Russian cosmonaut Pyotr Dubrov of Roscosmos, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and NASA astronaut Mark Vande Hei, pose for a photo during qualification exams, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 prime crew members, NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, second from left, and Russian cosmonaut Pyotr Dubrov of Roscosmos, second from right, are seen walking with friends and family during an official farewell ceremony prior to their departure to Baikonur for launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Mark Vande Hei of NASA, signs in for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

ESA Flight Surgeon Dr. Brigitte Godard, seated left, NASA Flight ‎Surgeon Jennifer Law, center, talk with Expedition 50 NASA astronaut Peggy Whitson ahead of the final qualification exams with Whitson and her fellow crew mates Russian cosmonaut Oleg Novitskiy of Roscosmos and ESA astronaut Thomas Pesquet, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member, Anne McClain of NASA is seen during Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 prime crew member Russian cosmonaut Pyotr Dubrov of Roscosmos waves during a press conference prior to his launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos arrive for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos arrive for Soyuz qualification exams iptcdow}, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 43 NASA Astronaut Scott Kelly, left, and Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) pose for a photo prior to departing the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, for Baikonur, Kazakhstan, Saturday, March 14, 2015. The trio are preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

From left to right, Expedition 64 backup crew members, NASA astronaut Mark Vande Hei, Russian cosmonaut Petr Dubrov of Roscosmos, Russian cosmonaut Oleg Novitskiy of Roscosmos and Expedition 64 prime crew members, Russian cosmonaut Sergey Ryzhikov of Roscosmos, Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos, and NASA astronaut Kate Rubins, pose for a photo after a press conference, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member Sergey Kud-Sverchkov of Roscosmos is seen during Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet walk out from suitup for their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) 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 64 crew members NASA astronaut Kate Rubins, left, Russian cosmonaut Sergey Ryzhikov of Roscosmos, center, and Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos arrive for Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 49 Russian cosmonaut Sergei Ryzhikov of Roscosmos dons his Russian Sokol suit ahead of the Soyuz qualification exams with fellow Russian cosmonaut Andrey Borisenko of Roscosmos and NASA astronaut Shane Kimbrough, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos wave during Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 crew members NASA astronaut Mark Vande Hei, right, and Russian cosmonaut Oleg Novitskiy of Roscosmos, left, are seen during Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos arrive for Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos meet with mission managers during Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 prime crew member Oleg Novitskiy of Roscosmos, holds up a toy cat that will be used in the Soyuz capsule to help indicate the start of weightlessness after leaving the Earth’s atmosphere, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos meet with mission managers for Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 backup crew member NASA astronaut Anne McClain, speaks during a press conference prior to the prime crew’s launch from the Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 29 Commander Mike Fossum, left, Japanese Aerospace Exploration Agency astronaut Satoshi Furukawa, Russian cosmonaut Sergei Volkov, right, are seen during the playing of the national anthem of the United States of America at a traditional welcome home ceremony at the Gagarin Cosmonaut Training Center in Star City, Russia, Thursday, Dec. 15, 2011. The crew landed on the steppes of Kazakhstan on November 22nd after spending five months living and working aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 prime crew member Russian cosmonaut Oleg Novitskiy of Roscosmos is seen during a press conference prior to his launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos meet with mission managers for their Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Pyotr Dubrov of Roscosmos, center, and Russian cosmonaut Oleg Novitskiy of Roscosmos, listen during a press conference prior to their launch from the Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)