24. Descartes employed the vortex theory to account for the circular movement of planets, which Newton later explained by gravity. The physics of Descartes postulated that whenever a physical object moves, something must move into its place, since there is no vacuum in the physical world. The entire world of matter is characterized from one end to the other by a circular or vortical motion of bodies, there being innumerable such vortices in the universe, including the great one of the planets around the sun.
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