Expedition 51 prime crew members, Flight Engineer Jack Fischer of NASA, left, and Soyuz Commander Fyodor Yurchikhin of Roscosmos, second left, are seen with Expedition 51 back up crew members, Soyuz Commander Sergey Ryazanskiy of Roscosmos, second from right, and Flight Engineer Randy Bresnik of NASA, right, during a press conference held at the Cosmonaut Hotel in Baikonur, Kazakhstan on Wednesday, April 19, 2017. The mission is set to launch April 20 from the Baikonur Cosmodrome. Photo Credit: (NASA/Aubrey Gemignani)

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