Saturn Blue Shadow
Few sights in the solar system are more strikingly beautiful than softly hued Saturn embraced by the shadows of its stately rings.
The gas planet's subtle northward gradation from gold to azure is a striking visual effect that scientists don't fully understand. Current thinking says that it may be related to seasonal influences, tied to the cold temperatures in the northern (winter) hemisphere. Despite Cassini's revelations, Saturn remains a world of mystery.
Credit: NASA/JPL/Space Science Institute