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I think we are all familiar with Newton's Law of Universal Gravitation.
Though it still can't be proved whether or not that apple fell on Newton,there is one point that we have to admit to: the discovery of the Law of gravitation is one of the greatest achievements of natural science in the 17th century. It has unified the law of the movement of objects on the earth's surface with that of the heavenly body and has a far-reaching effect on the development of Physics and Astronomy thereafter. Newton's Law of Universal Gravitation is a great milestone in the history of man's knowledge about Nature. But for Newton's Law of Universal Gravitation, it would have been difficult for man to explain how the heavenly body works, and our space travel / research wouldn't have been developing so fast.

Newton's law of gravity should be familiar to us all.
Was Newton really hit by the apple? No one can confirm it. But one thing we must admit is that the discovery of universal gravitation is one of the greatest achievements in the 17th-century natural science. It unifies the laws of the movement of objects on the ground with the laws of celestial motion, having a far-reaching influence on the future development of physics and astronomy and seting a milestone in the history of human's understanding nature. If there is no Newton's law of gravity, it will be very hard for humans to interpret the laws of celestial motion, and the current astronavigation will not enjoy such rapid development.