Kepler-1647 b Size Comparison (IMAGE) San Diego State University Caption Comparison of the relative sizes of several Kepler circumbinary planets, from the smallest, Kepler-47 b, to the largest, Kepler-1647 b. Kepler-1647 b is substantially larger than any of the previously known circumbinary planets. Credit Figure credit: Lynette Cook Usage Restrictions Credit Lynette Cook 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.