Rotating Dione
Rotating Dione Cassini took this set of 15 images of Dione over a 1.5-hour period on 1 October 2011 to watch Dione's "wispy terrain" rotate into view. Cassini was about 500,000 kilometers away from Dione at the time. NASA / JPL-Caltech / SSI / Emily Lakdawalla

"We're changing the world. Are you in?"
- CEO Bill Nye

Sign up for email updates