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To prepare for eventually sending astronauts to Mars,
NASA began taking applications Friday for four people to live for a year in Mars Dune Alpha. That's a 1,700-square-foot Martian habitat, created by a 3D-printer, and inside a building at Johnson Space Center in Houston.
The paid volunteers will work a simulated Martian exploration mission complete with spacewalks, limited communications back home, restricted food and resources and equipment failures.