Asteroid Ryugu (IMAGE) University of Tokyo Caption Ryugu is a C-type asteroid -- rich in carbon -- about 900m wide. Credit © 2019 Seiji Sugita et al., Science Usage Restrictions © 2019 Seiji Sugita et al., Science 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.