Telescope has detected molecules that, on Earth, are only produced by life in the atmosphere of the exoplanet K2-18b.\n\n## The Discovery\n\nSpectroscopic analysis of K2-18b’s atmosphere revealed the presence of **dimethyl sulfide (DMS)** and **dimethyl disulfide (DMDS)** — molecules that on Earth are exclusively produced by marine phytoplankton and other biological processes.\n\n## Why K2-18b?\n\nK2-18b is a “Hycean” world — a planet with a potential liquid water ocean beneath a hydrogen-rich atmosphere. It orbits within the habitable zone of its red dwarf star.\n\n- **Distance:** 120 light-years from Earth\n- **Size:** 8.6 times Earth’s mass\n- **Temperature:** Estimated ocean temperature of 0-40°C\n\n## Cautious Optimism\n\nResearchers emphasize that while these findings are exciting, non-biological processes could also produce DMS. Further observations are needed to confirm the biosignature.\n\nThe team plans to use JWST’s full spectroscopic range to look for additional biomarkers in upcoming observation windows.