Name of the scientist who said the sun was the center of the universe?

The scientist who proposed that the sun is the center of the universe was Nicolaus Copernicus. His heliocentric model, presented in his work "De revolutionibus orbium coelestium" in 1543, challenged the long-held geocentric view that placed the Earth at the center. Copernicus's ideas laid the groundwork for modern astronomy and changed our understanding of the solar system.