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Huygens discovered Saturn's moon Titan; Giovanni Domenico Cassini later discovered four other moons: Iapetus, Rhea, Tethys and Dione.
Mimas, Enceladus, Tethys, Dione, Rhea, Titan, Iapetus
In order of descending size, Titan, Rhea, Iapetus, Dione, Tethys.
Saturn has 10. Their names are Miams, Encelade, Tethys, Dione, Rhea, Titan,Hyperion, Iapetus, Phoebe, Ianus.
Saturn has over sixty moons, but the largest ones are Titan, Rhea, Iapetus, Dione, Tethys, Enceladus, and Mimas.
Saturn has nine satalites. They are Dione, Enceladus, Hyperion, Iapetus, Mimas, Phoebe, Rhea, Tethys, Titan.
Uranus' five largest moons are Titania, Oberon, Umbriel, Ariel, and Miranda. These were the first 5 moons seen from Earth : the two largest in 1787, the following two in 1851, and Miranda in 1948. *Ariel is slightly smaller than Umbriel, but is estimated to have greater mass.
I think you're confusing Saturn with Jupiter. Jupiter has four major moons, Saturn has seven. Saturn's moons were disovered by three people. Titan, Saturn's largest moon, was discovered by Christiaan Huygens. Tethys, Dione, Rhea, and Iapetus were discovered by Giovanni Domenico Cassini. William Herschel discovered Mimas and Enceladus. Galileo Galilei discovered Jupiter's four major moons.
They are all moons of the planet Saturn
The only natural satellite of Earth is the one called "Moon" or "Luna". There are hundreds of artificial ones, if not thousands.
The seven spherical (major) moons of Saturn, compared to the diameter of Earth's moon, in descending order, are:Titan:......... 148%,Rhea:........... 44%,Iapetus........ 42%,Dione:.......... 32%,Tethys:......... 30%,Enceladus:.... 14%,Mimas:.......... 12%.These are the only moons of Saturn that are massive enough to assume a spherical shape.
The largest 7 are Titan, Rhea, Iapetus, Dione, Tethys, Enceladus, and Mimas. Titan is the second-largest moon in the Solar System with a diameter of 5150 km (1.5 times our Moon). The next 4 are less than half the size of our Moon, and Enceladus and Mimas 12-14% as large.