Scientists and extraterrestrial enthusiasts are abuzz after a team of researchers studying the atmosphere of an exoplanet called K2-18 b with NASA’s James Webb Space Telescope (JWST) just announced that they detected high levels of either the chemical dimethyl sulfide or a very similar compound—billing it as a hint of alien life. Although most people have never heard of dimethyl sulfide, it’s all around us here on Earth. But what is this compound, and is it really a sign of life beyond Earth?

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