Exoplanet HAT-P-18 b (IMAGE) University of Montreal Caption An artistic representation of the “hot Saturn” exoplanet, HAT-P-18 b. Credit NASA/Eyes on Exoplanets Usage Restrictions Use with credit. License Original 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.