In Photos: The International Space Station Turns 20

Astronaut Mike Hopkins, Expedition 38 Flight Engineer, participates in the second of two spacewalks which took place on 24 December 2013. The spacewalks were designed to allow the crew to change a faulty water pump on the exterior of the Earth-orbiting International Space Station.

Photograph: Nasa Nasa/Reuters

Canadian Space Agency astronaut Chris Hadfield performing aboard the International Space Station a revised version of David Bowie’s song Space Oddity on 12 May 2013.

Photograph: NASA / CSA / CHRIS HADFIELD / HANDOUT/EPA