Mother and Daughter or Sisters?

Dione_TethysDione was the daughter of Tethys in Greek mythology. In the real world, Saturn’s moons Tethys and Dione are not mother and daughter. They are more like sisters since they’re believed to have formed out of the same disk around Saturn.

Dione is the upper moon in the picture; Tethys is the lower.

Image Credit: NASA

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