Jupiter was named after the Romans' most powerful god, and in 1644 astronomer Robert Hooke described Jupiter's Great Red Spot. However, it was Galileo Galilei that is most well known for revolutionary early studies of Jupiter. Among his astronomical discoveries, published in 1610, were the description of four small bodies orbiting Jupiter, the way our moon orbits Earth. This discovery meant that like Jupiter, the Earth is merely another planet, not the center of the universe. This revolutionary notion forever changed the world view of western civilization.