How seeing Earth from space affects your mind
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Tim Peake: How might his mission affect his world view?

11 December 2015 Last updated at 12:19 GMT

Fewer than 600 people have seen Earth from space - the rest of us will have to make do with incredible time-lapse footage such as this from the European Space Agency.

However, flown astronauts say the view has had a huge impact on them, making them think about issues such as sustainability.

Former astronaut Michael Lopez-Alegria explains the "Overview Effect" that British spaceman Tim Peake can expect on his forthcoming mission.

Video produced by Sara Barman.