What Is Kepler's Principle Of Plentitude?

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Soon after Galileo used the telescope to discover the Milky Way and the moon's craters, Kepler announced his three laws of planetary motion which inferred that other bodies in the Solar System have elliptical orbits. Kepler uses these principles to make a conclusion that our moon exists for us on the earth, not for other planets. He explains that each planet and its occupants is served by its own satellites. This pluralistic way of thinking suggests that the Earth is nothing special in regards to other planets and is just another planet revolving around a fixed star. Kepler extends heliocentrism to other solar systems and not just ours. Fontenelle argues for the principle of plentitude because he says that the fixed stars are so much further