Many people believed in superstition when in the time of newton life, so they afraid of some invisible phenomena. For example, appearance of comet was always related to disaster. In that time, many scientists considered that motion of planet and motion of object in earth were different matter. In contrast, Newton considered that due to the sky and the earth was made by the same God, they were regulated using the same law. Newton begun think about gravity in 1684. He developed Newton's gravitational theory. He developed three motion laws and mathematically proved it. The law state that the same law can be implemented to both subjects in the earth and the outer space. Then, Newton explains the theory in his book titled Principia mathematica. Due to no fund, Royal society is reluctant to publish the Newton famous work. But, Newton's friend, astronomer Edmond Halley, helped him to fund publication of his book in three step in 1687. (Halley then used Newton's law in his study about comet just like planet's, orbiting to the sun with ellipse track).
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