Expedition 46 backup crew members Kathleen Rubins of NASA, left, Anatoli Ivanishin of the Russian Federal Space Agency (Roscosmos), center, and Takuya Onishi of the Japan Aerospace Exploration Agency (JAXA) pose for a picture on the launch pad after rollout of the Soyuz rocket at the Baikonur Cosmodrome on Sunday, Dec. 13, 2015 in Kazakhstan. Launch of the Soyuz is scheduled for Dec. 15 and will send Expedition 46 prime crew members: Soyuz Commander Yuri Malenchenko of the Russian Federal Space Agency (Roscosmos), Flight Engineer Tim Kopra of NASA, and Flight Engineer Tim Peake of ESA (European Space Agency) to the International Space Station for a six-month stay.