Who proposed the heliocentric model, placing the Sun at the center of the universe?

The heliocentric model, which places the Sun at the center of the universe, was proposed by Nicolaus Copernicus. Here are the steps leading to this discovery:

1. Nicolaus Copernicus was a Polish astronomer who lived from 1473 to 1543. He was educated in Poland and Italy, and spent most of his working life as a church administrator in Poland.

2. Copernicus had a strong interest in astronomy from a young age. He was dissatisfied with the geocentric model of the universe, which placed the Earth at the center and was widely accepted at the time.

3. Through his observations and calculations, Copernicus developed the heliocentric model. This model proposed that the Sun was at the center of the universe, and that the Earth and other planets revolved around it.

4. Copernicus' ideas were controversial at the time, as they contradicted the teachings of the Church. He published his theory in his book "On the Revolutions of the Celestial Spheres" in 1543, just before his death.

5. Despite initial resistance, Copernicus' heliocentric model gradually gained acceptance. It was a major shift in our understanding of the universe and laid the groundwork for future astronomers like Johannes Kepler and Galileo Galilei.