Protoplanetary disk with spiral arms (IMAGE) University of Arizona Caption Image of a giant planet driving spiral arms in a protoplanetary disk from theoretical simulations. Credit L. Krapp and K. Kratter, University of Arizona Usage Restrictions This visual may only be used for the purpose of posting and/or reporting of this news release. Credit information must be provided as indicated. 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.