Saturn's A Ring (IMAGE) Cornell University Caption A team of Saturn moon keeps Saturn's A ring from spreading. This image from NASA's Cassini mission clearly show the ring's density waves created by the small moons. The waves look like the grooves in a vinyl record. Credit NASA 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.