18. Who was Nicolaus Copernicus? What is he most known for discovering?

Answer 1

Nicolaus Copernicus was a Polish mathematician and astronomer who lived in the 16th century. He is most known for proposing the heliocentric model of the universe, which placed the sun rather than the Earth at the center of the solar system. This theory revolutionized the field of astronomy and challenged the long-held belief in the geocentric model, where Earth was considered the center of the universe. Copernicus' work laid the foundation for modern astronomy and the scientific revolution.