Expedition 51 crewmembers Fyodor Yurchikhin pose for pictures in front of their Soyuz booster rocket.

In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 51 crewmembers Fyodor Yurchikhin of the Russian Federal Space Agency (Roscosmos, left) and Jack Fischer of NASA (right) pose for pictures April 14 in front of their Soyuz booster rocket. 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. Credit: NASA/Gagarin Cosmonaut Training Center/Andrey Shelepin