Scientists have confirmed that all seven planets in the TRAPPIST-1 system circle their star in a sort of gravitational lockstep with one another.
Similarly, the Jupiter moons Io, Europa and Ganymede are in orbital resonance: For every lap Ganymede completes around Jupiter, Europa makes two orbits and Io completes four. The TRAPPIST-1 resonances are much more complex, but they adhere to the same principle.
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