A possible way to shelter astronauts on Mars is to make structures from sulfur concrete. While concrete on earth is comprised of cement, gravel, and water, bringing water and cement into space would be prohibitive. That is what led researchers to think of an alternative and they decided that the widely-abundant sulfur was just the right choice. Said one researcher, “The Martian concrete we optimized (50 percent sulphur and 50 percent replicated Martian soil) is twice as strong—which, if one considers that on Mars there is only one-third the gravity—it corresponds to a very high strength concrete on Earth, the type of concrete we build skyscrapers with.”

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