Sir Isaac Newton’s greatest contribution to science was his discovery of the theory of gravitation and its importance. When Newton saw an apple falling from a tree, he realized that there had to be an exerting force that was pulling the apple down towards the earth. This force, which Newton called gravity, also pulls and holds the moon in the orbit, preventing it from floating away. Another theory Newton discovered is the theory of motion. This theory states that an object in motion will stay in motion until someone

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