Nicolaus Copernicus - Discovered that the Earth is not in the center of the Universe but it circles the Sun. Facts of life and pictures of the Polish astronomer.

Top-Biography.com: Nicolaus Copernicus - Relates the story of the painter, astronomer, physician, and mathematician who developed the heliocentric theory. Also includes timeline and quotations.

Nicolaus Copernicus - Detailed biography examines Copernicus' dissatisfaction with the Ptolemaic system of astronomy and his theory that the earth actually revolved around the sun. Also includes portrait.

Encarta: Copernicus, Nicolaus - Encyclopedia article provides an overview of the astronomer's early life, his education, and his revolutionary theory that the earth was not the center of the universe.