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Continue to ChatI had not thought of this regular decrease of gravity, namely that it is as the inverse square of the distance; this is a new and highly remarkable property of gravity. - Christiaan Huygens from https://whatsmyquote.com/quote/i-had-not-thought-of-this-regular-decrease-of-gravity-namely-that-it-is-as-the-inverse-square-of-the-distance