The theory that was made by Nicolaus Copernicus was that the sun is the center of the universe.
This changed how we viewed the solar system, and there are more discoveries yet to come.
About 1,400 years before Copernicus was even born,
Ptolemy wrote that the planets and sun orbited around the Earth.
The point that Ptolemy was trying to get across is that the Earth is the center of the universe. Copernicus later discovered that the sun is the center of the universe, which is also known as heliocentric. Copernicus knew something was fishy. When he was studying the movement