Six men from Russia, Europe and China are going to spend 520 days living together in a mock spacecraft, in a test to see how a mission to Mars might work.
The "Mars500" experiment, will begin on 3 June at Moscow's Institute of Biomedical Problems and end in November 2011.
Each astronaut will have three square metres of personal space and have to undertake scientific tasks on a daily basis.
Italian participant Diego Urbina, and Martin Zell, head of the European Space Agency's International Space Station (ISS) utilisation department, explain how the simulation will work.
One-Minute World News
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