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Moreover, the researchers inferred that Mars’ core is mostly made of a liquid iron alloy, with sulfur making up about 15 percent of its mass. A smattering of hydrogen, oxygen and carbon together comprise about 5 percent. The findings roughly align with some previous analyses of Martian meteorite compositions.
Researchers say that Mars' core is mainly liquid iron alloy, and its mass is 15% sulfur and 5% oxygen and carbon. This matches up to past meteorite tests.