History of Ryugu (IMAGE) University of Tokyo Caption A diagram to show how researchers believe the surface of Ryugu evolved over time. Credit © 2020 Morota et al. Usage Restrictions © 2020 Morota et al. 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.