Expedition 51 Soyuz Commander Fyodor Yurchikhin of Roscosmos, left, and Flight Engineer Jack Fischer of NASA, right, are seen as they depart building 254 a few hours ahead of their launch, Thursday, April 20, 2017, in Baikonur, Kazakhstan. Yurchikhin and Fischer launched in their Soyuz MS-04 spacecraft to the International Space Station to begin a four and a half month mission. Photo Credit: (NASA/Victor Zelentsov)