Copernicus first proposed his theory in his book, “On the Revolutions of the Heavenly Spheres”. He theorized that the center of the universe was the sun rather than the Earth. Many read his book yet few approved the theory. The people who did understand his theory were highly intelligent, still they could not grasp his central thesis. However, in the late sixteenth century the astronomer Tycho Brahe accepted some of Copernicus’s theory. He agreed that the planets orbited around the sun but he still thought that the sun revolved around Earth. It wasn’t until Galileo came along that Copernicus’s theory could become a reality. When Galileo invented the telescope, he gathered evidence in Copernicus’s favor. Galileo used this evidence to demonstrate