Participants watch broadcast of the video message of Roscosmos cosmonauts, from left, Sergey Mikayev, Sergey Kud-Sverchkov and Andrey Fedyayev from the International Space Station (ISS) during an educational marathon as part of Space Week at the Valentina Tereshkova National Space Centre in Moscow, Russia. This year marks the 65th anniversary of the first human spaceflight, carried out by Yuri Gagarin aboard the Vostok 1.
