We had one of our listeners—a PhD in biosignatures—ask to debate whether life on K2-18b is scientifically plausible, and wow, did we dive deep.

This episode unpacks the swirling controversy around the James Webb Space Telescope’s tantalizing detection of dimethyl sulfide (DMS) on K2-18b, a potential "Hycean" exoplanet with a hydrogen-rich atmosphere. DMS is a molecule that, on Earth, is almost exclusively produced by living organisms. Its possible presence—alongside methane and carbon dioxide—sparked headlines and hope. But is it real?

Our guest challenges the hype with a rigorous breakdown of the data, pointing out that re-analyses suggest the DMS signal might be statistical noise, or the result of oversimplified models. We also explore the fact that DMS has been found on lifeless comets, raising the specter of abiotic false positives.

Together, we dissect the limits of JWST’s capabilities, the complexity of exoplanet atmospheric modeling, and the fine line between scientific optimism and overinterpretation. If you’ve ever wondered how scientists distinguish life from lifelike chemistry across light-years, this episode is for you.

Expect sharp debate, grounded science, and a clear-eyed look at what it really takes to confirm extraterrestrial life.

Tune in and decide for yourself: are we glimpsing alien biology—or just the universe’s chemical tricks?

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