Illustration of Kepler-51 system (IMAGE) Penn State Caption Illustration of the Kepler-51 system and its inner three planets, which have unusually low density. New observations from NASA's James Webb Space Telescope suggest that at least one more planet is in the system. Credit NASA, ESA, and L. Hustak, J. Olmsted, D. Player and F. Summers (STScI) Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.