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The greeks discovered that the earth was the center of the universe. Earth was considered the heaviest of all four natural elements.
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Said that instead of the Earth being in the center of the universe with all of the planets orbiting it, the sun was the center of the universe.
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Discovered the exact orbits of the planets around the sun. Created three laws of gravity called Kepler's Laws
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Investigated the earthly effects of gravity
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Discovered that there was a force pulling things towards the center of the earth. Created Newton's three laws.
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Extended Newton's laws of gravity. Created the theory of relativity. Concluded that mass has an effect on gravity.