Who proposed the heliocentric theory which states that the sun is the center of the universe.Group of answer choicesGalileiAristotleCopernicusDa Vinci

The heliocentric theory, which posits that the Sun is at the center of the universe rather than the Earth, was proposed by Nicolaus Copernicus. His model marked a significant shift in astronomy and laid the groundwork for the Scientific Revolution.

Here's a brief overview of each figure mentioned in the choices to provide clarity:

1. Galilei: Galileo Galilei supported the heliocentric theory with his astronomical observations but did not originate it.
2. Aristotle: Aristotle proposed the geocentric model, where Earth is at the center of the universe.
3. Copernicus: Proposed the heliocentric theory in his work "De revolutionibus orbium coelestium" published in 1543.
4. Da Vinci: Leonardo da Vinci was a polymath known for his contributions to art, science, and engineering, but he did not significantly impact astronomical models.

Given this information, the correct answer is Copernicus.