K2-18b: From contested biosignatures to Hycean prospects and null SETI results guiding future exoplanet surveys
To the point
Anton introduced K2-18b as a water-rich world once tied to a possible life signal, but JWST observations found methane and CO2 with no ammonia, Gabriella Digennaro showed the signal could form abiotically, Ciardi Tremblay’s SETI team found no technosignatures and set limits on transmissions, and Daniel Angerhausen notes that null results still refine our search strategy, guiding future SKA surveys while K2-18b remains an intriguing target for studying distant oceans.
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