Stock Photo - At the Gagarin Cosmonaut Training Center in Star City, Russia, the Expedition 51 prime and backup crewmembers pose for pictures April 5 before flying to their launch site at the Baikonur Cosmodrome in Kazakhstan for final pre-launch preparations. From left to right are backup crewmembers Randy Bresnik of NASA and Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos) and prime crewmembers Fyodor Yurchikhin of Roscosmos and Jack Fischer of NASA. Fischer and Yurchikhin will launch April 20 on the Soyuz MS-04 spacecraft from Baikonur for a four and a half month mission on the International Space Station. Photo: NASARob Navias