Animation of Gas Motions in SDC13 (IMAGE) Royal Astronomical Society Caption Animation showing exactly how the dense ammonia gas moves within the SDC13 filament network. Credit Credit: G. Williams et al. / University of Cardiff Usage Restrictions None 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.