The dark rule of the church before the Renaissance refers to the Middle Ages. The Middle Ages (about 476 ~ 1453) is an era in European history (mainly in Western Europe). From the fall of the Western Roman Empire hundreds of years later (476), the feudal system ruled the world until the Renaissance (1453). The word "Middle Ages" was used by humanists in the late15th century. Europe in this period did not have a strong regime to rule. Feudal separatism brought frequent wars, which led to the stagnation of science and technology and productivity, and people lived in hopeless pain. Therefore, the Middle Ages or early Middle Ages are generally called "dark ages" in Europe and America. Traditionally, it is considered as a period of relatively slow development in the history of European civilization. In fact, the Middle Ages were not as useless as people thought.

Galileo galilei (1564- 1642) is a famous Italian mathematician, physicist, astronomer and philosopher, and a pioneer of modern experimental science.

1590, Galileo made a famous experiment of "two balls landing at the same time" on the leaning tower of Pisa, which overthrew Aristotle's theory that "the falling speed of an object is proportional to its weight" and corrected this erroneous conclusion that lasted for 1900. He lived in the Renaissance and was still persecuted by the church, which fully demonstrated the strength of the church.