Image made by the Cassini orbiter. (see Cassini Science Mission for more info)
from Seymour Simon's blog:
The Cassini orbiter - an unmanned space probe - sent back this magnificent image of Saturn last month. The reason this photograph is so spectacular is that the orbiter is shooting from the "dark side" of Saturn, so the planet is glowing with the sun’s light behind it.
Look closely at the bottom left-hand corner of the photograph - do you see anything there? Those two little spots are Enceladus and Tethys, two of Saturn’s moons.
Here’s what Carolyn Porco, leader of the Cassini imaging team at the Colorado-based Space Science Institute, said about this image:"Of all the many glorious images we have received from Saturn, none are more strikingly unusual than those we have taken from Saturn’s shadow. They unveil a rare splendor seldom seen anywhere else in our solar system."