10 September 2014
Compared to the age of the solar system — about four-and-a-half billion years — a couple of decades are next to nothing. Some planetary locales change little over many millions of years, so for scientists who study the planets, any object that evolves on such a short interval makes for a tempting target for study. And so it is with the ever-changing rings of Saturn.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/fvP7LFTy658/140910102040.htm
