RU Lup Gas Only (IMAGE) National Radio Astronomy Observatory Caption ALMA image of the planet-forming disk around the young star RU Lup, showing a giant set of spiral arms made out of gas. The structure extends to nearly 1000 astronomical units from the star. Credit ALMA (ESO/NAOJ/NRAO), J. Huang; NRAO/AUI/NSF, S. Dagnello Usage Restrictions https://public.nrao.edu/media-use/ 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.