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1997. Claire Datnow. It was once believed that the Milky Way was the only galaxy in the entire universe. Edwin Hubble, America's greatest astronomer, discovered that the Milky Way is just one of many galaxies. Hubble also proved that the galaxies he studied were moving away from the earth. This meant that the universe is expanding. Because of his discoveries Edwin Hubble became an international celebrity and his name is still well known today. 128 pages, soft cover, b&w photographs. Grades 4Ð10.