Jean Dominique Cassini
![Jean Dominique Cassini](https://science.nasa.gov/wp-content/uploads/2023/09/IMG000787.jpg?w=4096&format=jpeg)
December 17, 2004
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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.