Photo de stock - At the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, the Expedition 51 prime and backup crewmembers raise the flags of Russia, the U.S. and Kazakhstan in traditional ceremonies April 7 as part of their pre-launch activities. From left to right are prime crewmember Fyodor Yurchikhin of the Russian Federal Space Agency (Roscosmos) raising the Russian flag, backup crewmember Randy Bresnik of NASA joining prime crewmember Jack Fischer of NASA to raise the American flag and backup crewmember Sergey Ryazanskiy of Roscosmos raising the Kazakh flag. Yurchikhin and Fischer will launch April 20 on the Soyuz MS-04 spacecraft from the Baikonur Cosmodrome for a four and a half month mission on the International Space Station. NASAVictor Zelentsov