US astronaut Scott Kelly and his girlfriend Amiko Kauderer pose for a picture in front of the 6 meters long Tsar Pushka (Tsar Cannon) in Moscow on March 6, 2015. Kelly, with Russian cosmonauts Gennady Padalka and Mikhail Kornienko, is to take off from Russian-leased Kazakh Baikonur cosmodrome to the International Space Station (ISS) on March 27. AFP PHOTO / STRINGER