What theory did Giordano Bruno discover?

Giordano Bruno is best known for his contributions to the heliocentric theory, which posits that the Sun, rather than the Earth, is at the center of the universe. He expanded on Copernican ideas by suggesting that the universe is infinite and contains countless stars and planets, potentially with their own life forms. Bruno's philosophical views challenged the geocentric model and traditional religious beliefs, ultimately leading to his persecution and execution. His work laid the groundwork for modern cosmology and the understanding of an expansive universe.