Isaac Newton's investigations of gravity primarily explained that gravity acts on all objects in the universe. His law of universal gravitation described how every mass attracts every other mass with a force that depends on their masses and the distance between them. This was a groundbreaking understanding that contributed to the development of classical mechanics and provided a mathematical framework for understanding the motion of celestial bodies.
While his work indeed implied that the sun is more massive than Earth and helped in understanding the solar system, the other two statements (Jupiter having more moons than Earth and Earth not being the center of the universe) are not directly explained by Newton’s investigations of gravity.
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