Many are familiar with the theory: the Earth is the center the universe. Recent studies have shown that the Sun is the center of the universe and the Earth orbits the Sun. A mathematician from Poland, Nicolaus Copernicus, has created a heliocentric model where the Sun is placed in the center of the planets. Galileo Galilei, an Italian astronomer, confirmed Copernicus’s heliocentric model to be correct
Galileo was the first astronomer to create a telescope to observe the heavens. Galileo made plenty observations: the Sun had spots on the surface, the moon’s surface was rough, discovered the moons of Jupiter, and that Venus has phases. All these observations contributed to disproving the Ptolemaic model, a model that shows that the Earth is the center of the universe.