OTD In Space - October. 25: Giovanni Cassini Discovers Saturn's Moon Iapetus
On October 25, 1671, the Italian astronomer Giovanni Cassini discovered a new moon at Saturn! ‘On This Day in Space’ Video ...
Phys.org5mon
Whether Saturn's rings are young or old, its moons may be as ancient as the planet itself
This allowed them to construct a chronology of impacts for Saturn's most heavily cratered regular satellites—Mimas, Enceladus, Tethys, Dione, and Rhea. This established age limits of 4.1 and 4.4 ...