  Nicolaus Copernicus (1473)Copernicus was an astronomer, mathematician, and economist who developed the heliocentric theory of the universe that placed the Sun, not the Earth, at the center of our solar system and helped launch a scientific revolution. Though Copernicus had first conceived of his revolutionary model decades earlier, he delayed publication because it raised new problems that had to be explained, and his book did not see print until he was on his deathbed. What heliocentric hypotheses preceded Copernicus\'s? More... Discuss |