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The planets have a tangential velocity, they are speeding along sideways relative to the sun. If there was no gravity, this velocity would take the planets away from the sun, but the sun has a huge gravitational force which counteracts this effect. The suns gravitational force attracts the planets in, against this tangential velocity. If the planets were to gradually slow down, then they would eventually spiral into the sun, but in space there is no drag, so the planets maintain their speed and their orbits.

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14y ago

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