The moon Dione, at the top in the image, is actually closer to the spacecraft here. However, because of the similar albedo, or reflectivity, of the two moons and because of the location of a particularly large crater near the south polar region of Dione, the moon appears to blend seamlessly with Rhea. The large, faint crater Evander is centered at about 57 degrees south latitude, 1 [...]
Full story at http://spacefellowship.com/news/art22629/conjoined-moons.html
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