23 Dez 1672 Jahr - French astronomer Giovanni Domenico Cassini discovers Rhea, a previously-unknown satellite of the planet Saturn. Rhea is the second-largest overall, and the third moon of Saturn to be discovered by Earth astronomers, Titan having been found by Christiaan Huygens on March 25, 1655 and Iapetus by Cassini on October 25, 1671

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