Isaac Newton did not prove that the Sun is the center of the universe. While his work revolutionized our understanding of gravity and planetary motion, it was Nicolaus Copernicus who first proposed the heliocentric model (Sun-centered) in the 16th century.

Here's why:

* Newton's Laws of Motion and Gravity: Newton's laws explained how objects move and interact under the influence of gravity. His work showed that planets orbit the Sun due to the Sun's gravitational pull. However, this didn't necessarily mean the Sun was the center of everything in the universe.

* The Universe is Vast: Newton's work was focused on our solar system. We now know the universe is much larger and contains countless galaxies. The Sun is just one star among many, and its significance in the grand scheme of the universe is not the same as it is within our own solar system.

So, how did we come to understand the universe is not Sun-centered?

* Later Astronomical Observations: Over time, astronomers made observations that contradicted the heliocentric model. For example, the discovery of other galaxies and the realization that the Milky Way is just one among many.

* Modern Understanding of Cosmology: Today, we understand that the universe is expanding, and there is no single center. The concept of a "center" is not relevant on the scale of the entire universe.

In essence, while Newton's work laid the foundation for our understanding of gravity and planetary motion, it didn't prove the Sun is the center of the universe. It was a combination of later discoveries and our evolving understanding of cosmology that led to the current understanding of the universe.