Final answer:
Copernicus proposed the most accurate system of the universe, known as the heliocentric model.
Step-by-step explanation:
The most accurate system of the universe was proposed by Copernicus, who suggested a heliocentric system where the Sun is at the center of the solar system. Before Copernicus, the prevailing view was the Ptolemaic model, which proposed a geocentric system with Earth at the center. Copernicus' heliocentric model was later supported by observations by other scientists like Galileo and Kepler, leading to a shift in our understanding of the universe.