[via NASA Planetary Photojournal]

A beautiful picture of Mimas, a satellite of Saturn (mission Cassini-Huygens).

Mimas drifts along in its orbit against the azure backdrop of Saturn’s northern latitudes in this true color view. The long, dark lines on the atmosphere are shadows cast by the planet’s rings.

Saturn’s northern hemisphere is presently relatively cloud-free, and rays of sunlight take a long path through the atmosphere. This results in sunlight being scattered at shorter (bluer) wavelengths, thus giving the northernmost latitudes their bluish appearance at visible wavelengths.

At the bottom, craters on icy Mimas (398 kilometers, or 247 miles across) give the moon a dimpled appearance.[…]

The images were obtained using the Cassini spacecraft narrow angle camera on Jan. 18, 2005, at a distance of approximately 1.4 million kilometers (870,000 miles) from Saturn. Resolution in the image is 8.5 kilometers (5.3 miles) per pixel on Saturn and 7.5 kilometers (4.7 miles) per pixel on Mimas. The image has been contrast-enhanced to aid visibility.