
At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 39/40 Flight Engineer Steve Swanson of NASA (left) signs…

At the Gagarin Cosmonaut Training Center in Star City, Russia and with the visage of Yuri Gagarin, the first human…

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 39/40 Soyuz Commander Alexander Skvortsov of Roscosmos (right) signs…

At the Gagarin Cosmonaut Training Center in Star City, Russia and with the visage of Yuri Gagarin, the first human…

At the Gagarin Cosmonaut Training Center in Star City, Russia and with the visage of Yuri Gagarin, the first human…

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 39/40 Soyuz Commander Alexander Skvortsov of Roscosmos smiles before…

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 39/40 Soyuz Commander Alexander Skvortsov of Roscosmos smiles before…

A NASA-funded sounding rocket launches into an aurora in the early morning of March 3, 2014, over Venetie, Alaska.

Two-percent scale models of the Space Launch System solid rocket boosters and core stage RS-25 engines have been designed and…