In ancient Greece, early scientists did not have anything more than their senses to help them study the world around them. These scientists often studied their environment through touch, taste, smell, sight, and sound. During the 17th century, people like Galileo, Copernicus, and Newton revolutionized science with breakthroughs of physics through the laws of gravity, the sun-centered theory, and the discovery of atoms. With modern technology and advances in the scientific method, physics incorporates things that are not observable to the naked eye.