Credit: NASA/JPL-Caltech/Space Science Institute

Saturn’s rings cast shadows on the planet, except their shadows appear to be inside out! The edge of the outermost A ring can be seen at the top left corner of the image. Moving towards the bottom of the page, one can see the faint Cassini Division, the opaque B ring and the innermost C ring, which contains several ringlets that appear dark against Saturn in this geometry.

http://www.astrowatch.net/2014/04/cassini-sees-saturns-rings-casting.html