Newton used the discoveries of Copernicus, Kepler and Galileo in order to make his own new discoveries.
Newton made the discovery by proving that the moons and planets in the solar system were made of "material substance" just like the earth.
Copernicus, Kepler, Galileo and Newton have a common topic of celestial bodies and the universe.
They recognized that the sun was at the center of the universe, not the earth.
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