Exkurs in die Geschichte: Der Planet mit der Hutkrempe   ESA's probe on board the NASA/ESA/ASI spacecraft Cassini is named after the Dutch scientist Christiaan Huygens, who discovered Titan in 1655. Cassini entdeckt das Ringsystem     Cassini discovered the Saturnian satellites Lapetus in 1671, Rhea in 1672, and both Tethys and Dione in 1684. In 1675 he discovered what is now known today as the Cassini Division - Saturn's rings are split largely into two parts by a narrow gap and that the rings were in fact swarms of tiny moonlets too small to be seen individually.