What happens when astronauts get grouchy?

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In 2010 a multinational crew of six astronauts set off on a trip to Mars with a difference – they were confined to a bunker on Earth. Dr Erin Flynn-Evans from Nasa explains how during this simulated interplanetary mission they spent 17 months together in a mocked-up spacecraft to measure psychological and behavioural changes. (Photo: Astronauts on the surface of Mars. Credit: Getty Images.)