Astronomy
The Structure and Composition of Saturn's Rings
Quick fact
Saturn's rings are incredibly thin—only about 10 meters thick on average—yet they span over 280,000 kilometers in diameter. Some ring particles are as small as dust grains, while others are as large as mountains.
Why this is interesting
When you look at Saturn through a telescope, its rings seem like solid bands of color. But what if I told you those bands are actually made of countless icy particles, and that the gaps between them are carved by invisible gravitational forces?