Why do planets and moons spin differently from one another?
Quick Answer
They spin differently because each body formed from separate collisions, accretion, and tidal interactions. Over time, impacts and gravity from nearby bodies can speed up, slow down, or even reverse rotation.
The Full Story
There is no single rotation pattern for planets and moons because their spins are set by complex histories. During formation, growing bodies absorbed material with different motions, and giant impacts could tilt or reorient them. Tidal forces from a nearby massive partner can also slow rotation, as happened to many moons and to Mercury. Venus and Uranus are famous examples of unusual spin states shaped by long-term gravitational interactions and collisions.
Key Facts
YouTube Angle
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"Why do some worlds spin upside down or backwards?"
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