Marsquakes — that is, earthquakes on Mars — could generate enough hydrogen to support life there, a new study finds. Humans and most animals, plants and fungi get their energy mainly from chemical reactions between oxygen and organic compounds such as sugars. However, microbes depend on a wide array of different reactions for energy; for instance, reactions between oxygen and hydrogen gas help bacteria called hydrogenotrophs survive deep underground on Earth, and previous research suggested that such reactions may have even powered the earliest life on Earth.
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