When did Isaac Newton discover that the gravity holds the solar system together?
Newton’s theory was universal and not specifically about the solar system. He published it in “Philosophiae Naturalis Principia Mathematica” on July 5th 1687. (NB do not confuse this with Bertrand Russell’s 3-volume work Principia Mathematica published 1910-1913.) Philosophiae Naturalis Principia Mathematica, published in 1687, described universal gravitation and the three laws of motion, laying the groundwork for classical mechanics. By demonstrating consistency between Kepler’s laws of planetary motion and this system, he was the first to show that the motion of objects on Earth and of celestial bodies are governed by the same set of natural laws. The unifying and predictive power of his laws was central to the scientific revolution, the advancement of heliocentrism, and the broader acceptance of the notion that rational investigation can reveal the inner workings of nature. == Isaac Newton’s theory of universal gravitation (part of classical mechanics) states the following: Every si
