A stunning discovery by the James Webb Space Telescope (JWST) has shaken the scientific world—possible signs of life have been found on a distant exoplanet named K2-18 b, orbiting a cool dwarf star about 120 light-years away in the Leo constellation.
JWST detected traces of dimethyl sulfide (DMS) in the planet’s atmosphere—a molecule that, here on Earth, is exclusively produced by biological processes, mainly by marine microorganisms like plankton. This makes DMS an exciting potential biosignature—a chemical sign of life!
But that’s not all…
The planet also shows significant amounts of methane and carbon dioxide, both associated with biological activity on Earth.
Even more promising: K2-18 b lies in the habitable zone of its star—the region where temperatures may allow liquid water to exist, a key ingredient for life as we know it.This planet is classified as a Hycean world—a type of planet theorized to have a hydrogen-rich atmosphere and vast oceans beneath. These are relatively new candidates in the search for life, and this marks the first time such a world has shown potential biological signatures.
While the findings aren’t confirmed as definitive proof of alien life yet, they’re the most compelling evidence so far—enough to make scientists rethink where and how we look for life in the universe.
