Which new idea did Copernicus introduce that significantly modified the geocentric model of the universe?

Answer 1

Nicolaus Copernicus introduced the heliocentric model of the universe, which proposed that the Sun, rather than the Earth, is at the center of the universe. This concept significantly modified the geocentric model, which had maintained that the Earth was the center of the universe, with all celestial bodies orbiting around it. Copernicus's heliocentric theory laid the groundwork for modern astronomy and challenged the prevailing notions of the cosmos in his time.