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He didn't. The word gravity was in use in the English language by about 200 years before Newton developed his theory of gravity. People already knew that gravity made objects fall, Newton just gave a highly accurate insight into how gravity works. Newton was 44 years old when he published is Principia in which He laid out his theory. These are his main contributions:

described gravity as an attractive force between all objects with mass that is directly proportional to the objects and inversely proportional to the square of their distances.

He proposed that gravity not only made objects fall on Earth but was the attractive force that kept the various celestial objects in their orbits.

Newton's formulation of gravity is so accurate that it is even used to plot the trajectories of spacecraft. It is only in instances of extreme speed or density or when extreme precision is needed that scientists must use general relativity to describe gravity.

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