Expedition 51 backup crewmembers pay tribute at the statue of Sergey Korolev during traditional pre-launch ceremonies.

In Baikonur, Kazakhstan, Expedition 51 backup crewmembers Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos, left) and Randy Bresnik of NASA pay tribute at the statue of Sergey Korolev, the iconic Russian space designer, during traditional pre-launch ceremonies April 7. They are serving as 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 for a four and a half month mission on the International Space Station. NASA/Victor Zelentsov