Expedition 51 prime crew member Soyuz Commander Fyodor Yurchikhin of Roscosmos, left, laughs with Expedition 51 backup crew member Sergey Ryazanskiy of Roscosmos during a press conference on Wednesday, April 19, 2017 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Launch of the Soyuz rocket is scheduled for April 20 and will carry Yurchikhin and Flight Engineer Jack Fischer of NASA into orbit to begin their four and a half month mission on the International Space Station. Photo Credit: (NASA/Aubrey Gemignani).

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