Galileo discovered four of Jupiter's moons almost four hundred years ago. Galileo Galilei was an Italian physicist and astronomer. He was born in Pisa on February 15, 1564. ... Later that same year, he became the first person to look at the Moon through a telescope and make his first astronomy discovery.
Isaac Newton's Discoveries. Newton made discoveries in optics, motion and mathematics. ... His momentous book on physics, Principia, contains information on nearly all of the essential concepts of physics except energy, ultimately helping him to explain the laws of motion and the theory of gravity