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It requires a VERY SPECIFIC speed for a planet to have an orbit that is exactly circular. Let's assume, for example, that at a certain point in the orbit, the planet's speed is less than this specific speed. In that case, the Sun's attraction will pull the planet closer to the Sun.This, in turn, will make the planet faster; and half an orbit later, it will be faster enough to "escape" from the Sun again. The final result of all this is that the planet will move around the Sun in an elipse.

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