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Nature of heavy objects to fall and lighter objects to rise.
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"The attraction of all things towards the center of the earth."
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There was a force of attraction between heavenly bodies.
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Differented between mass, force, and weight, gravity varies with the distance from the center of the earth.
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Geocentric model of the solar system.
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Found that objects accelerate at the same rate no matter the size.
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Did not discover gravity itself, but discovered that it was universal.