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Enceladus and Tethys (two tiny moons of Saturn) taken by Cassini. Enceladus (a tiny 504 kilometers, 313 miles across) is on the right with a plume of water erupting from it's South polar region. Tethys (1,062 kilometers, 660 miles across) is on the left
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Which is the more massive?
Tethys is the larger of the two in physical size and mass. The surface gravity on both is very similar (about 0.01g to 0.015g). However, Enceladus has a higher density.