The next-best thing to being on Mars

Last week, two MIT students began living, working and communicating with the outside world as if they were on a mission to Mars. Whenever they go outside their small, round habitat where eight people are spending a two-week "mission," they don spacesuits and pass through an airlock. When they send e-mail, it takes 20 minutes before the recipient can see it-the time it takes for radio waves to travel to and from the red planet.

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