in 1564 At first he studied philosophy. But later he studied mathematics and astronomy He was very interested in the way the earth and other planets move around the sun. He found out several important facts about our world. He also started a new of working in science Before Galileo, scientists did not do experiments. They ust guessed about how something happened. But Galileo was different. He did not just make guesses. He did experiments and watched to see what happened