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Orbital momentum (or inertia) keeps the planets moving per Newton's First Law; gravitational pull from the Sun causes the orbit to assume an elliptically-shaped path. If effect, they constantly fall (accelerate) towards the Sun but constantly miss it.

An explanation appealing to general relativity might assert that gravitation in an effect in which mass curves spacetime, and that planets only travel in straight lines (geodesics) through curved space.

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11y ago

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