What did Giordano Bruno mean by the multiplicity of worlds?

Giordano Bruno’s theory of the "multiplicity of worlds" was a radical departure from the traditional, finite view of the universe held during his time.1

By proposing this concept, Bruno suggested that the universe is infinite and populated by innumerable worlds that are substantially similar to those found in our own solar system. This theory rejected the prevailing geocentric model and extended beyond the Copernican heliocentric theory, which still maintained that the universe was finite and enclosed by a sphere of fixed stars.21

Bruno’s cosmological vision was rooted in his monistic philosophy, which posited that all substances are part of a basic unity. By arguing that the universe is infinite and contains countless other worlds, he challenged the established Aristotelian physics and the rigid cosmological frameworks supported by the religious authorities of the 16th century.321