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Why did Giordano Bruno think the universe was infinite?

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Giordano Bruno’s belief in an infinite universe was rooted in his synthesis of Copernican astronomy and Neoplatonism.12

By combining these frameworks, Bruno moved beyond the traditional view of a finite universe—which even the heliocentric model of his time maintained—to conceptualize the universe as an infinite, living organism. He viewed this infinite cosmos as being in a constant state of development and infused with divine life. In his philosophy, the universe was composed of monads as its ultimate constituents, with various world-systems functioning as its parts.12

This perspective was central to his broader philosophical system, which rejected the rigid Aristotelian and Scholastic principles favored by the church at the time. Because he maintained these unorthodox ideas with such tenacity, he was ultimately tried by the Inquisition and executed as a heretic.13