The tiny moon Epimetheus casts a small shadow on the upper atmosphere of the planet Saturn. Epimetheus is just 116 km (72 miles) in diameter and orbits Saturn at a distance of 151,400 km (94,100 miles) and the amount of sunlight Saturn receives on average only about 1.1 percent of the sunlight we get, so I am rather surprised the shadow is so distinct.

I like this image there almost seems to be some depth in those clouds.

Credit: NASA/JPL/Space Science Institute