K2-18b: A Hycean World in the Habitable Zone with Potential DMS Signatures and Observational Challenges

To the point

K2-18b could be a Hycean world with a deep ocean beneath a hydrogen-rich atmosphere in the habitable zone, but habitability remains uncertain because thick atmospheres, tidal heating, and UV chemistry could hinder life, and while hints of DMS and methane are intriguing, abiotic explanations are possible, so more JWST observations and orbital measurements are needed to determine its true potential for life.