Multiple choice general knowledge science & technology What scientist first proposed that the Sun is the center of the solar system? Copernicus Ptolemy Kepler Tycho Brahe Reveal answer Fill a bubble to check yourself A Correct answer Explanation Nicolaus Copernicus first proposed the heliocentric model (Sun-centered) in the 16th century. Ptolemy supported the geocentric model, while Kepler and Tycho Brahe came later and built upon Copernicus's work.