TY - JOUR A1 - Cuzzi, Jeff N. A1 - Burns, Joseph A. A1 - Charnoz, Sébastien A1 - Clark, Roger N. A1 - Colwell, Josh E. A1 - Dones, Luke A1 - Esposito, Larry W. A1 - Filacchione, Gianrico A1 - French, Richard G. A1 - Hedman, Matthew M. A1 - Kempf, Sascha A1 - Marouf, Essam A. A1 - Murray, Carl D. A1 - Nicholson, Phillip D. A1 - Porco, Carolyn C. A1 - Schmidt, Jürgen A1 - Showalter, Mark R. A1 - Spilker, Linda J. A1 - Spitale, Joseph N. A1 - Srama, Ralf A1 - Sremcević, Miodrag A1 - Tiscareno, Matthew Steven A1 - Weiss, John T1 - An evolving view of Saturn's dynamic rings N2 - We review our understanding of Saturn's rings after nearly 6 years of observations by the Cassini spacecraft. Saturn's rings are composed mostly of water ice but also contain an undetermined reddish contaminant. The rings exhibit a range of structure across many spatial scales; some of this involves the interplay of the fluid nature and the self-gravity of innumerable orbiting centimeter- to meter-sized particles, and the effects of several peripheral and embedded moonlets, but much remains unexplained. A few aspects of ring structure change on time scales as short as days. It remains unclear whether the vigorous evolutionary processes to which the rings are subject imply a much younger age than that of the solar system. Processes on view at Saturn have parallels in circumstellar disks. Y1 - 2010 UR - http://www.sciencemag.org/ U6 - https://doi.org/10.1126/science.1179118 SN - 0036-8075 ER -