When astronauts live on the Moon permanently, they're going to need a safe habitat, ideally made out of local construction material. A new paper suggests that lunar astronauts could cover a 17-meter crater with a dome made from a lunar regolith-based geopolymer. A 3D printer would extrude a paste made of lunar regolith that would be sintered together into the shape of the dome. This would provide protection from radiation and could even maintain a pressurized habitat.
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