Extraterrestrial life on Mars still remains an option (Credit: NASA)
If microscopic Martian life is producing the methane, it likely resides far below the surface, where it's still warm enough for liquid water to exist (Credit: NASA/Susan Twardy)
New research has strengthened the possibility that biological life may exist beneath the surface of Mars. Scientists from Imperial College London have shown that the level of methane on the Red Planet can't be explained by meteorites in the atmosphere. This leaves the theory that microorganisms are producing methane gas as a by-product of their metabolic processes as one of the remaining possible explanations.
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