Saved on this device

Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Astronomy

The Thickness and Composition of Saturn's Rings From Cassini Data

Quick fact

Cassini's measurements showed that Saturn's main rings are remarkably thin, typically only about 10 meters to 1 kilometer thick, despite spanning over 280,000 kilometers in diameter. The rings are composed almost entirely of water ice, with a small fraction of rocky material.

Why this is interesting

You've probably seen pictures of Saturn's majestic rings, but how thin are they really? Imagine a sheet of paper stretched across a football field—that's the scale we're talking about.