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Edwin Hubble (born November 20, 1889, Marshfield, Missouri, U.S.—died September 28, 1953, San Marino, California) was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as the leading observational cosmologist of the 20th century. Hubble was the son of John Powell Hubble, a businessman who worked in the insurance industry. His mother, the former Virginia Lee James, was a homemaker who ran the household alone...