JWST data suggest exoplanet K2-18b may have molten surface rather than a watery ocean

A multi-institutional team of astronomers, Earth scientists and planetary physicists has found evidence, via data from the James Webb Space Telescope (JWST), that some hycean exoplanets may have molten surfaces rather than watery oceans. In their study, published in The Astrophysical Journal Letters, the team analyzed data from JWST as it was focused on the hycean exoplanet K2-18b.