Expedition 51 crewmembers Fyodor Yurchikhin of the Russian Federal Space Agency (Roscosmos, left) and Jack Fischer of NASA (right) arrive at their launch site in Baikonur, Kazakhstan April 5 for final pre-launch training after a flight from the Gagarin Cosmonaut Training Center in Star City, Russia. Fischer and Yurchikhin will launch April 20 on the Soyuz MS-04 spacecraft for a four and a half month mission on the International Space Station. Photo: NASA/Victor Zelentsov