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Last updated on April 16, 2014 at 1:21 EDT
Jean Dominique Cassini
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Jean Dominique Cassini

January 14, 2005
Jean Dominique Cassini (1625-1712) discovered Saturn's moons Iapetus, Rhea, Tethys, and Dione. In 1675, Cassini discovered that Saturn's rings are separated into two parts by a gap. The gap is now called the Cassini Division in his honor.