Astronomy
The Formation and Dynamics of Planetary Ring Systems
Quick fact
Saturn's rings are mostly water ice, but they are only about 10 meters thick on average—thinner than a house is tall, yet spanning over 280,000 kilometers in diameter.
Why this is interesting
You've seen pictures of Saturn's majestic rings, but have you ever wondered why they are there, how they stay so flat, and why they don't just crash into the planet or clump together into a moon?