A team of Nasa recruits has begun living in a dome near a barren volcano in Hawaii to simulate what life would be like on Mars.
The isolation experience, which will last a year starting on Friday, will be the longest of its type attempted.
Experts estimate that a human mission to the Red Planet could take between one and three years.
The six-strong team will live in close quarters under the dome, without fresh air, fresh food or privacy.
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Source Credits: BBC