NASA contest finalists show off their Mars habitat models

Yes, we've yet to successfully send humans to Mars, but we already need to start thinking how we can stay there for long stretches of time -- or even for good. NASA launched the 3D-Printed Habitat Challenge back in 2015 to find a suitable artificial housing for the first wave of Martian residents, and now the agency has narrowed the contestants down to five after seeing the realistic virtual models they created. The agency and its project partner, Illinois' Bradley University, judged 18 teams' models created using a specialized software.

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