Saturn's moon Dione,
credit hereDione [dy-OH-nee] was discovered in 1684 by Giovanni Cassini. It is an icy body similar to
Tethys and
Rhea. Its density is 1.43 gm/cm
3, which makes it the densest moon of Saturn other than
Titan. Dione is probably composed of a rocky core making up one-third of the moon's mass, with the rest water-ice. Its ice coverage is less than that of Tethys and Rhea.
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