Saturn's four moons

Huygens thought that the 6 known satellites (4 around Jupiter, Titan around Saturn and Moon around Earth) matched the 6 known planets, so that was that. Cassini proved him wrong.
 Gian Domenico Cassini Italy 1671 Saturn's four moons

Huygens thought that the 6 known satellites (4 around Jupiter, Titan around Saturn and Moon around Earth) matched the 6 known planets, so that was that. Cassini proved him wrong.