The commonly held view of the universe was one developed by 2nd-century Alexandrian astronomer Ptolemy. ... This is known as the geocentric view of the solar system. ... This theory, known as the heliocentric view proposed by Polish astronomer Nicolaus Copernicus in the early 1500s. ... Galileo strongly supported the Copernican model and played a major role in advancing this theory and creating a more modern view of the solar system. ...

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