Tentative DMS and DMDS Detections on K2-18b: A Cautious Path Toward Biosignature Claims
To the point
Using the James Webb Space Telescope, astronomers detected tentative signs of dimethyl sulfide and dimethyl disulfide in the atmosphere of the rocky exoplanet K2-18b, but the result is only three-sigma and could arise from non-biological chemistry, so a five-sigma confirmation and ruling out abiotic sources are needed before any claim of life.