Expedition 49 NASA astronaut Shane Kimbrough, seated left, Russian cosmonauts Sergei Ryzhikov, seated center, and Andrey Borisenko of Roscosmos sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC) as backup crew members: NASA astronaut Mark Vande Hei, standing left, Russian cosmonaut Alexander Misurkin of Roscosmos and Russian cosmonaut Nikolai Tikhonov of Roscosmos look on, Thursday, Sept. 1, 2016 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 be

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Expedition 49 NASA astronaut Shane Kimbrough, seated left, Russian cosmonauts Sergei Ryzhikov, seated center, and Andrey Borisenko of Roscosmos sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC) as backup crew members: NASA astronaut Mark Vande Hei, standing left, Russian cosmonaut Alexander Misurkin of Roscosmos and Russian cosmonaut Nikolai Tikhonov of Roscosmos look on, Thursday, Sept. 1, 2016 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 one. Photo Credit: (NASA/Bill Ingalls) Expedition 49 GCTC Museum Visit (NHQ201609010003)

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Photo credit: © NASA Image Collection / Alamy / Afripics
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