How do we know?
↻ One of the pages with a moving picture
A spacecraft dove between Saturn and its rings, 22 times.
- Saturn’s rings aren’t solid. They’re made of billions of chunks of ice and rock.
- Most chunks are as small as dust or as big as a house. A few are as big as mountains!
- Every chunk is circling around Saturn, like a tiny moon.
- Scientists think the chunks are pieces of comets, asteroids or moons that Saturn’s strong gravity tore apart.
The Cassini spacecraft dove between Saturn and its rings 22 times in 2017. Its measurements make many scientists think the rings are young, but that idea is still debated.
The first clue was much older. In 1610 Galileo looked at Saturn from Padua, Italy, and its rings looked like “ears”! Christiaan Huygens, born in The Hague in 1629, later said the “ears” were a ring.
Most chunks are as small as dust or as big as a house, and a few are as big as mountains.
Wow number
30 feet is about how thick the rings usually are. Very thin for something so huge!
Myth or fact?
Saturn is the only planet with rings. Myth. Other planets have rings too.
Saturn could float in a giant bathtub. Fact. It’s the only planet less dense than water.
Think about it
Saturn’s rings are slowly losing chunks. What might Saturn look like far in the future?
Where in the world?
Padua, Italy where Galileo saw Saturn in 1610 and its rings looked like “ears”. Christiaan Huygens, born in The Hague in the Netherlands in 1629, later said the “ears” were a ring — 45.4064° N, 11.8768° E.
Where these facts come from
Every number on page 16, and who measured it
This page tells us what the rings are made of, and that Saturn could float.
Saturn: Facts — NASA, the U.S. space agency
science.nasa.gov/saturn/facts
We checked it on 31 October 2026
This page tells us how thin Saturn's rings are.
Rings — NASA, the U.S. space agency
science.nasa.gov/mission/cassini/science/rings
We checked it on 31 October 2026
This page tells us Galileo looked at the sky in Padua.
Galileo's years in Padova — The University of Padua in Italy, where Galileo taught
unipd.it/en/galileo-anni-padovani
We checked it on 31 October 2026
This page tells us Galileo saw "ears" and Huygens figured out the ring.
Saturn's rings — ESA, Europe's space agency
esa.int/Science_Exploration/Space_Science/Cassini-Huygens/Saturn_s_rings
We checked it on 31 October 2026
This page tells us Huygens was born in The Hague in 1629, and when he found Saturn's moon Titan.
25 March — ESA, Europe's space agency
esa.int/Science_Exploration/Space_Science/25_March
We checked it on 31 October 2026
This page tells us how Cassini dove between Saturn and its rings.
Overview — NASA, the U.S. space agency
science.nasa.gov/mission/cassini/grand-finale/overview
We checked it on 31 October 2026
This page tells us scientists are still debating how old the rings are.
Saturn’s Rings: Young and Ephemeral, Three NASA Ames Studies Say — NASA, the U.S. space agency
nasa.gov/solar-system/saturns-rings-young-and-ephemeral-three-nasa-ames-studies-say
We checked it on 31 October 2026
Has this changed?
How the rings formed is still debated, so this answer may change.
Scientists keep studying the measurements from the Cassini spacecraft, and they may find that the rings are older or younger than they thought.
Words from this page
- comet
- A ball of ice and dust that travels around the Sun.
- asteroid
- A rocky object, much smaller than a planet, that travels around the Sun.
Try it!
See how a wide ring can be almost invisible from the side.
1. Sprinkle a thin ring of sugar around a coin on black paper. 2. Look at it from straight above. 3. Now crouch down and look from the side, level with the paper.
What happens: from the side, the wide ring almost disappears. Saturn’s rings are wide but very thin!
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