Expedition crewmembers Fyodor Yurchikhin pose for pictures before departing for pre-launch training.

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 51 crewmembers Fyodor Yurchikhin of the Russian Federal Space Agency (Roscosmos, left) and Jack Fischer of NASA (right) pose for pictures April 5 before departing for their launch site at the Baikonur Cosmodrome in Kazakhstan for final pre-launch training. .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: NASA/Rob Navias