ISS

U.S. astronaut Michael Hopkins and Russian cosmonauts Oleg Kotov and Sergey Ryazanskiy put on space suits before a training session at the Star City space centre outside Moscow...U.S. astronaut Michael Hopkins (L) and Russian cosmonauts Oleg Kotov (C) and Sergey Ryazanskiy put on space suits before a training session at the Star City space centre outside Moscow, August 23, 2013. Hopkins, Kotov and Ryazanskiy are scheduled to be part of a mission to the International Space Station (ISS) that will launch in September 2013.

Sergei Remezov/Reuters

US astronaut Michael Hopkins, left, and Russian cosmonauts Oleg Kotov, centre, and Sergey Ryazanskiy put on spacesuits before a training session at the Star City space centre outside Moscow. Mr Hopkins, Mr Kotov and Mr Ryazanskiy are scheduled to be part of a mission to the International Space Station that will launch in September 2013.

photo provided by the National Aeronautics and Space Administration NASA on 10 June 2013 shows NASA astronaut Chris Cassidy, an Expedition 36 flight engineer, using a 400mm lens on a digital still camera to photograph a target of opportunity on Earth some 250 miles below him from inside the 'Cupola' of the International Space Station ISS. Cassidy has been aboard the orbital outpost since late March and will continue his stay into September 2013, NASA said. The Cupola, a dome shaped module with windows, was launched and installed as a panoramic control tower for operations outside of the ISS, in 2010.

Nasa/EPA

Nasa astronaut Chris Cassidy, an Expedition 36 flight engineer, uses a 400mm lens on a digital still camera to photograph a target of opportunity on Earth, some 250 miles below him from inside the “Cupola” of the International Space Station. Mr Cassidy has been aboard the orbital outpost since late March and will stay until September, Nasa said. The Cupola, a dome-shaped module with windows, was launched and installed as a panoramic control tower for operations outside of the ISS in 2010.