
K2-18b’s Atmospheric Clues: A Hycean Planet and the Search for Life
K2-18b has captivated the scientific world as one of the most compelling Hycean planet candidates—exoplanets with hydrogen-rich atmospheres and subsurface liquid oceans. Observations from the James Webb Space Telescope detected prominent molecules like water vapor, methane, carbon dioxide, and, notably, dimethyl sulfide (DMS)—a compound produced by marine algae on Earth and a potential biosignature. This…