Hot Rocky Exoplanet (IMAGE) University of Chicago Caption A study suggests that exoplanets close to their stars may actually retain a thick atmosphere full of water. Above, an artist's illustration of the exoplanet WASP-121b, which appears to have water in its atmosphere. Credit Engine House VFX, At-Bristol Science Centre, University of Exeter Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.