Trappist-1 (IMAGE) University of California - Riverside Caption The Trappist-1 planetary system has three planets in its habitable zone, whereas our system only has one. Credit NASA/JPL-Caltech 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.