Aristotle was a Greek philosopher who pointed out the Earth was spherical because its shadow was always circular.
Copernicus
Copernicus was an important person who claimed we live in a heliocentric solar system, or one where we consider the Sun as the center of the universe instead of the Earth as the center of the universe.
Isaac Newton
Isaac Newton was a scientist who developed the theory of gravity as well as the three laws of motion.
Edwin Hubble
Edwin Hubble was an astronomer who is famous for proving the existence of other galaxies. The Hubble space telescope is named after him.
