Astronomy
The Composition and Structure of Saturn's Rings System
Quick fact
Saturn's rings are over 99% water ice, with a small fraction of rocky material, and they span about 280,000 kilometers but are only tens of meters thick in places.
Why this is interesting
You've seen images of Saturn's majestic rings, but did you know they are not solid bands—they are made of countless icy particles, and their structure is a dance of gravity and resonance?