"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"This Excellent Mathematician having given us, in the Transactions of February last, an account of the cause, which induced him to think upon Reflecting Telescopes, instead of Refracting ones, hath thereupon presented the curious world with an Essay of what may be performed by such Telescopes; by which it is found, that Telescopical Tubes may be considerably shortened without prejudice to their magnifiying effect. On his invention of the catadioptrical telescope, as he communicated to the Royal Society."
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Source: Sir Isaac Newton, Andrew Motte, N. W. Chittenden (1850). “Newton's Principia: The Mathematical Principles of Natural Philosophy”, p.66
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