"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Doth not this Æthereal Medium in passing out of Water, Glass, Crystal, and other compact and dense Bodies into empty Spaces, grow denser and denser by degrees, and by that means refract the Rays of Light not in a point, but by bending them gradually in curve Lines? And doth not the gradual condensation of this Medium extend to some distance from the Bodies, and thereby cause the Inflexions of the Rays of Light, which pass by the edges of dense Bodies, at some distance from the Bodies?"
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Source: Sir Isaac Newton (1730). “Opticks:: Or, A Treatise of the Reflections, Refractions, Inflections and Colours of Light”, p.324
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