now-in-3d-maps-begin-to-bring-exoplanets-into-focus-eclipse_mapping_wasp-18b ← Previous Next → The exoplanet WASP-18b is so hot that water molecules are split apart on its “dayside” that always faces its nearby sun, according to new research using the JWST. Image credit: NASA/JPL-Caltech (K. Miller/IPAC)