No one's quite sure how man would handle the multi-month schlep out to Mars, with suspected muscle wastage and cabin fever would be among the chief concerns.
There's one way to find out however: lock three volunteers in a mock-up capsule in Moscow and lock the door for three months. That's an edition of Big Brother I'd like to see.
The test is just a warm-up for a 500 day test later this year. The Telegraph has the full story.