The brilliant scientist Galileo Galilei devoted his life to several areas of science. First, he carried out astronomical observations, thanks to which he made amazing discoveries of the phases of Venus, the moons of Jupiter, the uneven surface of the Moon and spots on the Sun. Secondly, he studied the movement of bodies. As a result, he called into question the entire Aristotelian physics that had dominated Western science for 2000 years. But the main merit of the scientist, which left the deepest mark in history, was his desire, even at the risk of death at the stake, to defend a new way of studying the world - the scientific method based on empirical facts and mathematical accuracy.