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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.