cassini

Why does Saturn have rings?

Pioneer 11 made the first fly-by of Saturn in 1979.

Pioneer discovered new moons and another ring. Why do you think Saturn has rings?

Why does Saturn have rings?

Scientists have ideas about why Saturn has rings, but no one knows for sure.

What are Saturn's rings made of? Are they solid like the CD you used to make your model? Or are they made of many particles dancing in formation around the planet? Four robotic spacecraft from Earth have visited Saturn—Pioneer 11, Voyager 1, Voyager 2, and Cassini. They have revealed many surprising things about Saturn's rings.
False color rings

The small color differences in Saturn's rings have been enhanced in this picture from Voyager 2 data.

Rings showing Cassini Division

This Voyager 2 picture shows the gap in the rings called the Cassini Division.

60 ringlets

Over 60 bright and dark ringlets show up in this color enhanced image from Voyager 2 data.

The rings are about 400,000 kilometers (240,000 miles) wide. That's the distance from the Earth to the Moon! But the rings are as little as 100 meters (330 feet) thick. They range from particles too tiny to see to "particles" the size of a bus. Scientists think they are icy snowballs or ice covered rocks.

There are actually many rings—maybe 500 to 1000. There are also gaps in the rings. (That's why we put some black rings on our model Saturns.)

Cassini on its way to Saturn

The Cassini spacecraft arrived at Saturn in July 2004 and is still there. It is studying Saturn, its rings, and its moons much more thoroughly than the earlier spacecraft could.

Cassini also carried a probe, called Huygens (HOY-guns), that parachuted into the atmosphere of Saturn's giant moon Titan. Huygens sent back amazing information and images from this strange world whose surface we have never seen.



Here's an animation of the Huygens probe landing on Titan.

Cassini and Huygens have made exciting new discoveries.

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