World Space Week is held every year from 4 October to 10 October. The United Nations General Assembly declared the annual event in 1999 as "an international celebration of science and technology, and their contribution to the betterment of the human condition".

The dates were chosen to recognise two important dates in space history: the launch of Sputnik 1, the first man-made Earth satellite, on 4 October, 1957 and the signing of the Outer Space Treaty on 10 October, 1967.

To celebrate the 15th World Space Week, IBTimes UK presents 15 of the most amazing photos taken by crew members on board the International Space Station.