Expedition 50 backup crew member NASA astronaut Jack Fischer signs a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC) as fellow backup crew members ESA astronaut Paolo Nespoli, left, Russian cosmonaut Fyodor Yurchikhin of Roscosmos, center, and Expedition 50 prime crew ESA astronaut Thomas Pesquet look on, Wednesday, Oct. 26, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia.

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Keywords: 50, bill, center, city, cosmonaut, expedition, fischer, fyodor, gagarin, ingalls, jack, nasa, pesquet, prelaunch, roscosmos, rus, russia, space, star, thomas, training, yurchikhin