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Expedition 49 backup crew members: NASA astronaut Mark Vande Hei, seated left, Russian cosmonauts Alexander Misurkin, seated center, and Russian Nikolai Tikhonov of Roscosmos sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC) as prime crew members NASA astronaut Shane Kimbrough, standing left, Russian cosmonauts Sergei Ryzhikov, standing center, and Andrey Borisenko 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.