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Orbital Resonance
Incredibly, three of the four largest moons of Jupiter (Ganymede, Europa and Io) have orbital periods that are whole number ratios with each other (1:2:4). The big gap in Saturn's rings is caused by a moon much further out that has an orbital period double that of the gap! We've even found exoplanet systems with these patterns. They're all the result of orbital resonance. This video explains how that mechanism works.

CORRECTION: In the video I say that Ganymede, Europa and Io are the largest moons are jupiter. Actually here are the 4 largest moons from largest to smallest:

Ganymede
Callisto
Io
Europa

Here's my video on resonance:
https://youtu.be/dihQuwrf9yQ

Here's my video about bad maths:
https://youtu.be/C91gKuxutTU

This is Dr Becky Smethurst's channel:
https://www.youtube.com/channel/UCYNbYGl89UUowy8oXkipC-Q

This is Beardyman's channel:
https://www.youtube.com/user/beardyman

This is Jay Foreman's channel:
https://www.youtube.com/user/jayforeman51

This is the Veritasium video mentioned at the start:
https://youtu.be/t-_VPRCtiUg

Here's the paper I found that explains orbital resonance:
http://articles.adsabs.harvard.edu/pdf/1976ARA%26A..14..215P

Image credits:
Picture of Dwayne Johnson - Aarón Sánchez

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