Three of the crew who completed the simulated Mars mission
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The realities of a mission to Mars

Six men who were in total isolation for over 500 days on a simulated mission to Mars have emerged from their capsule in a Moscow warehouse.

For 18 months their routine mirrored life in a real spaceship. The project was aimed at testing how their minds and bodies would cope on a long-haul spaceflight.

The BBC's Jonathan Amos reports on the realities of a mission to Mars.

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