Galileo Galilei

Galileo was born on 15 Feb, 1564. He was an italian physician, mathematician and astronomer. He improved the telescope and astronomical observation and he supported copernic theory that sun-centered solar system. One of his famous experiment is falling body. According to the biography, it said that Galileo had used two balls with same material but different masses to do the experiment. He dropped the ball from the leaning tower of Pisa. At that time, most of people believe in aristoteles's theory that the object which has larger mass will drop faster than the object with less mass. But after Galileo dropped balls, people found these two balls fall on the ground simultaneously. This experiment changed everyone's thought. Galileo believed in copernic theory, supported the sun-centered solar system. But the church against the copernic theory, so Roman Catholics told Galileo everything supports sun-centered  theory will be forbidden. Galileo ignored this problem for several years, but he believed in science, he published a book Dialogue Concerning the Two Chief World Systems. The church thought this book supports copernic theory and attacked Aristoteles, so finally he was arrested in the house by church. Because of heart disease, he was died 8 Jan,1642. All of Galileo's book about science wasn't forbidden by church anymore until 1853.