The French scientist Laplace (1749-1827) re-proposed this hypothesis, and based on the principles of mechanics, he used rigorous mathematical reasoning to prove the scientific nature of this theory, which in turn brought about major changes in the world view. . Laplace was born in the town of Beaumont in Normandy, France. His family was poor when he was a child, and he relied on the help of his neighbors to complete his studies. Laplace had a mathematical genius and was highly appreciated by his professors when he was in college. After graduating from university at the age of 18, he was introduced to the Paris Army School as a mathematics professor by the famous mathematician D'Alembet.

For a long time, scientists have been troubled by questions such as "how the solar system was formed" and "why the earth orbits the sun." Even the famous scientist Newton had trouble answering. In the end, he had to turn to theology to explain the ultimate meaning of motion. The reason is attributed to "the first impulse of God." Laplace conducted detailed research on the formation of the universe and wrote two books: "On the System of the Universe" and "Celestial Mechanics". He believed that the solar system was formed from a primitive nebula. The primitive nebula formed a primitive fireball due to the movement and mutual attraction of particles. The primitive fireball further shrank, and due to the combined effects of attraction and repulsion, gradually differentiated to form the planets of the solar system, and finally formed the The current solar system. He calculated the characteristics of the solar system and profoundly explained the movements and orbits of the planets in the solar system. His theory was gradually recognized by the scientific community. The nebula theory brought about a change in the view of the universe. It pointed out that the universe was developed in the movement of nature itself, expelling the earth emperor from the universe. When Napoleon asked Laplace why there was no God in his doctrine, Laplace proudly said: "I have no need of that hypothesis." This became a famous saying among atheists of the time who despised God.