Found via Digg: Astronomy Picture of the Day: 2006 October 16 – In the Shadow of Saturn.

Saturnian eclipse This spectacular false-color photo was taken by the Cassini-Huygens spaceprobe when it entered Saturn’s solar shadow, meaning the planet stood directly between the camera and the sun. You’re getting the equivalent of the “diamond ring” effect that can be seen on earth during total solar eclipses, only in this case, there are actual rings involved. The reason the “dark” side of Saturn looks illuminated is that the planet’s rings are reflecting sunlight back at it.