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127 AD Developed the theory that the Earth was the center of the universe and all other planets and the sun revolved aorund it.
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He believed that there is no effect or motion without a cause. The cause of the downward motion of heavy bodies,was related to their nature, which caused them to move downward toward the center of the universe.
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Newton developed the Universal law of gravity, which said that, every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
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First person to determine a value for the constant "G" in Newton's Universal Law of Gravity, which is 6.67x10^-11. He conducted an experiment to directly measure the gravitational attraction between objects.
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Einstein had proposed his Special Theory of Relativity, setting the maximum speed as that of light and gives the famous relationship between energy and matter. Einstein didn't believe gravity was a force at all; he said it was a distortion in the shape of space-time, otherwise known as "the fourth dimension"