Orbital resonances of the Galilean moons of Jupiter

Orbital resonances of the Galilean moons of Jupiter
Orbital resonances of the Galilean moons of Jupiter Animation of the 1:2:4 Laplace resonance between Ganymede, Europa, and Io. The labels indicate the ratios of orbital periods: Europa's is twice Io's, and Ganymede's is four times Io's. Wikimedia Commons

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