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NASA Held a Contest to Design Homes on Mars and the Top Three Designs are Out of this World
Credit: NASA's Marshall Space Flight Center

It's been three years since NASA announced its 3-D Printed Habitat Competition, sending designers and architects scrambling to imagine the best design for a home on Mars—one that could be constructed using materials already available on Earth's neighbor planet.

Now, Nasa has announced the top three finalists, and their designs are something else.

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