Expedition 51 backup crew member Sergey Ryazanskiy signs in for the start of final crew qualification exams.
At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 51 backup crew member Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos, left) signs in for the start of final crew qualification exams March 30 as his crewmate, Randy Bresnik of NASA (right) looks on. They are backups to Fyodor Yurchikhin of Roscosmos and Jack Fischer of NASA, who will launch April 20 on the Soyuz MS-04 spacecraft from the Baikonur Cosmodrome in Kazakhstan for a four and a half month mission on the International Space Station.