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The Earth is rotating, and continues to rotate because of its inertia. There are is only one force acting on the Earth that might slow it down. Tidal forces are, VERY slowly, slowing the Earth's rotation, and the lost energy is transferred to the Moon, which is VERY slowly moving away.

Things that are spinning on Earth always slow down because of friction; air friction, or the friction in the bearings of a spinning object. There are no such factors in play in space.

WHY is the Earth - and the Sun, and Moon, and all the other planets - rotating? The most likely explanation is that the entire planetary nebula of gas and dust that collapsed to form the Sun and planets was slowly rotating itself.

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13y ago

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