Habitable Zone Reimagined: Water Might Thrive Beyond Old Boundaries

A new study argues the habitable zone is not a rigid boundary. For tidally locked exoplanets around M- and K-dwarfs, heat from the day side can be transported to the night side, allowing liquid water to persist there, and even very cold worlds could harbor subsurface water beneath thick ice. This broadened view aligns with JWST findings of water in warm, close-in exoplanets and expands the range of environments considered potentially life-friendly.