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He made the theory that the sun was in the center
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Galileo shows the properties of gravity. What he did was he had one-pound weight and a one-hundred pound weight, dropped at the same moment, and hit the ground at the same time.
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The orbit of a planet about a star is an ellipse with the star at one focus.A line joining a planet and its star sweeps out equal areas during equal intervals of time.The square of the sidereal period of an orbiting planet is directly proportional to the cube of the orbit's semimajor axis.
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I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. III. For every action there is an equal and opposite reaction.
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erhaps the most important event in the history of science, the Principia lays out Newton's comprehensive model of the universe as organized according to the law of universal gravitation. The Principia represents the integration of the works of all of the great astronomers who preceded Newton, and remains the basis of modern physics and astronomy.
