Key terms

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resonance
an orbital condition in which one object is subject to periodic gravitational perturbations by another, most commonly arising when two objects orbiting a third have periods of revolution that are simple multiples or fractions of each other

tidal heating
the heating of a planet or moon’s interior by variable tidal forces caused by changing gravitational pull from a nearby planet or moon

Please take the time to check out the source for this material from Openstax if you plan to use this in your lesson plan!: https://openstax.org/books/astronomy/pages/12-key-terms