Nicolai Copernicus (1473-1543) was a Polish astronomer. Copernicus proposed that the center of the solar system was the sun and not the earth. Copernicus questions the assumption that the Earth was the center of the universe. He also challenged the assumption that objects in the heavens were made from an unchanging substance that is not found on earth. For him, the earth was simply another planet. In 1543, Copernicus published his book: On the Revolutions of the Heavenly Bodies. The idea of a sun-centered universe was first proposed by Aristarchus of Samos, an ancient Greek mathematician and astronomer, about 200 B.C.
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