Wearing helmets weighing 100 kilos, spinning in a centrifuge and exercising while weightless: Russian cosmonauts and astronauts from abroad have to undergo a gruelling training process before blasting off into space.
Wearing helmets weighing 100 kilos, spinning in a centrifuge and exercising while weightless: Russian cosmonauts and astronauts from abroad have to undergo a gruelling training process before blasting off into space.