"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"As Attraction is stronger in small Magnets than in great ones in proportion to their Bulk, and Gravity is greater in the Surfaces of small Planets than in those of great ones in proportion to their bulk, and small Bodies are agitated much more by electric attraction than great ones; so the smallness of the Rays of Light may contribute very much to the power of the Agent by which they are refracted."
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Source: Sir Isaac Newton (1718). “Opticks: Or, A Treatise of the Reflections, Refractions, Inflections and Colours of Light. ...”, p.326
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