Possible Biomarker Signals on Hycean Exoplanet K2-18b Detected by JWST, But Not Yet Confirmed

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Using the James Webb Space Telescope, scientists including Nikku Madhusudhan, Måns Holmberg, Subhajit Sarkar, and Savvas Constantinou detected signals of potential biosignature molecules—dimethyl sulfide and dimethyl disulfide—in the atmosphere of K2-18b, a hydrogen-rich Hycean world with a liquid ocean in its star’s habitable zone, but the result is not confirmed and requires more testing before it could be evidence of life beyond Earth.