Looking for extraterrestrial life in the form of biosignatures will involve peering into the constituents of a planetary atmosphere and identifying out of equilibrium gases that tell us something biological is going on. But here’s the problem, as demonstrated recently in work on the exoplanet K2-18b. We’ve identified dimethyl sulfide at this world, which might just be a life detection. On Earth, dimethyl sulfide comes from dimethylsulfoniopropio…
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