Future moon bases could be built with 3D printers that mix materials such as moon regolith, water and astronauts’ urine.

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When NASA astronauts return to the moon in 2024, they’ll need a lunar base that allows them to stay on the surface. And the astronauts may build their base using something readily available: their urine.

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As part of NASA’s Artemis program, the first woman and next man on the moon will be landing at the lunar South Pole. It’s a place with fluctuating temperatures that will require astronauts to “learn how to live and operate on the surface of another celestial body,” according to the agency.

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Unfortunately, the astronauts can’t just land a habitat on the lunar surface and set up shop. Instead, they’ll have […]

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