Artist Impression (IMAGE) National Radio Astronomy Observatory Caption This is an artist impression of gas flowing like a waterfall into a protoplanetary disk gap, which is most likely caused by an infant planet. Credit NRAO/AUI/NSF, S. Dagnello Usage Restrictions All NRAO images and videos are copyright protected on behalf of the National Radio Astronomy Observatory (NRAO), Associated Universities, Inc. (AUI), and the National Science Foundation (NSF), and are licensed for use under the Creative Commons Attribution 3.0 Unported license (http://creativecommons.org/licenses/by/3.0/) 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.