Which scientist is a astronomer who concluded the sun was the center of the universe?

The astronomer who concluded that the Sun was the center of the universe is Nicolaus Copernicus. In the 16th century, he proposed the heliocentric model, which placed the Sun at the center rather than the Earth. This revolutionary idea laid the groundwork for modern astronomy, challenging the long-held geocentric view. Copernicus's work was pivotal in the Scientific Revolution, influencing later astronomers like Galileo and Kepler.