What causes the ghostly, dark 'spokes' that appear to rotate across Saturn's rings?
Chapter 1

The frozen debris field

Chapter 2

Deciphering the optical illusion

Chapter 3

The cosmic traffic controllers

Chapter 4

A temporary cosmic masterpiece

YOUR GOAL

Master of The secret life of Saturn's rings

Ch 3 · The cosmic traffic controllers
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artiteacher The Roche limit boundary

Jul 12

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artiteacher The cosmic traffic controllers

We're just drifting ice and dust floating in the dark, Guided by the shepherd moons pulling on our arc.

Jul 10

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artiteacher The chaotic F ring

Jul 12

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The Roche limit boundary

artiteacher The Roche limit is the critical distance within which a planet's gravitational tidal forces will rip an approaching celestial body apart.

Jul 10

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The chaotic F ring

artiteacher Saturn's outermost narrow ring, the F ring, displays a highly active, braided, and knotted structure due to gravitational disruptions.

Jul 10

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Ring Wranglers
BETA

artiteacher Sort drifting ice and rock to discover what Saturn's rings are really made of.

Jul 10

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Fun Fact

Shepherding waves: The tiny moon Daphnis orbits inside a ring gap, kicking up kilometer-high waves of icy dust along the edges.

Jul 10

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Glossary
shepherd moon (noun)
A small natural satellite that orbits near the edge of a planetary ring to keep its particles confined. In 1980, Voyager 1 photographed Prometheus and Pandora maintaining the sharp boundaries of Saturn's F ring.

Jul 10

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Gossip

What theme would you use to name a new moon?

Jul 10

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Quiz

Which spacecraft spent 13 years orbiting Saturn, discovering many of these delicate gravitational interactions before its mission ended in 2017?

Jul 10

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artiteacher The gravity of shepherd moons

Jul 12

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Quiz

Which tiny Saturnian moon orbits inside the Keeler Gap and creates dramatic vertical waves in the ring material?

Jul 10

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artiteacher Mysterious spokes in the dark

Jul 12

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Quiz

What is the scientific term for the distance within which a planet's tidal forces will tear an approaching moon apart?

Jul 10

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Quiz

Why don't the particles inside Saturn's main rings clump together to form one giant, solid moon?

Jul 10

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Quiz

Which of Saturn's rings is famous for its braided, twisted appearance caused by the moons Prometheus and Pandora?

Jul 10

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Quiz

What shape do the gravitational waves created by the moon Prometheus look like as it interacts with the F ring?

Jul 10

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Quiz

What causes the ghostly, dark 'spokes' that appear to rotate across Saturn's rings?

Jul 10

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Quiz

What do astronomers call the small moons that orbit near ring edges and use gravity to keep the rings from spreading out?

Jul 10