super-Earth gap illustration (IMAGE) Rice University Caption An illustration depicting the scarcity of exoplanets about 1.8 times the size of Earth that were observed by NASA’s Kepler spacecraft. Credit Graphic courtesy of A. Izidoro/Rice University Usage Restrictions Must credit: "Graphic courtesy of A. Izidoro/Rice University" 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.