Galileo
heliocentric theory
The two main proponents in the early days were Nicolas Copernicus and Galileo.
The discovery did not support Copernicus's theory directly but it raised doubts about the ancient theory of Ptolemy that said that all objects in the sky are in orbit round the Earth. Galileo was an aggressive supporter of Copernicus's theory but eventually it was Kepler's theory that became accepted and is still used today. Both Copernicus and Kepler placed the Sun at the centre but Kepler's elliptical orbits are supported by the later theory of dynamics.
Galileo Galilee
Copernicus proposed the theory of a heliocentric model while Galileo improved the telescope, studied Jupiter's moons, and supported the heliocentric model
Copernicus' theory was that Earth is not the center of the universe and we revolve around the Sun.
Copernicus' theory was that Earth is not the center of the universe and we revolve around the Sun.
It was Copernicus's theory and Galileo had very little evidence for it at the time of his quarrel with the Vatican, as he discovered when they put him on trial and asked for the evidence.
No, Nicolaus Copernicus was not burned at the stake. He died of a stroke in 1543, before his heliocentric theory gained widespread acceptance. His theory, which proposed that the Earth and other planets revolve around the Sun, was later supported by evidence and became the foundation of modern astronomy.
Nicolaus Copernicus
Ptolemy proposed a geocentric model, with Earth at the center and planets orbiting it. Copernicus suggested a heliocentric model, with the Sun at the center of the solar system. Galileo's telescopic observations supported the heliocentric model and provided evidence for Copernicus' theory.
Galelei derived his theory from Copernicus. To Copernicus it was just a theory. Galilei managed to prove it when he invented the telescope and was able to see the moons orbiting Jupiter.