Galileo is famous for many things but is probably best known for discovering Jupiter's four moons. The moons around Jupiter are called "Gallilean moons." More » History Middle Ages

Galileo Galilei was an Italian genius that is famous for many things, most notably for his contributions to astronomy. He is responsible for discovering Jupiter's four moons, advancing telescope technology and declaring ... More »

Galileo Galilei was a scientist who made many discoveries in astronomy and physics, such as four of the moons of Jupiter, the phases of Venus, Saturn's rings and that an object accelerates at a constant rate. Although Ga... More »

While he did not invent the telescope, Galileo modified one of the devices before discovering a number of planets and moons, including Venus, which inspired a scientific revolution. His contention that Copernicus was cor... More »

Galileo discovered several key laws of motion, such as the Principle of Inertia, and used a telescope to view the Moon and later Jupiter, where he discovered its moons for the first time. He wrote a book supporting the C... More »

After Galileo built his first telescope in 1609, he observed and described the landscape of the moon, discovered four of the moons of Jupiter, discovered the phases of Venus, and discovered sunspots. Galileo's discovery ... More »

Galileo Galilei is credited with discovering four of Jupiter's moons. He made this and many other discoveries in 1610 after building his first telescope. More »