Two of Saturn's moons appear to form a conjoined world in an image from NASA's Cassini orbiter released September 24.
The double-moon effect is aided by the matching reflectivity of Dione (top), which is closer to the camera, and Rhea, which is farther away but slightly larger than Dione. The strategic alignment of a large, faint crater at the "bottom" edge of Dione completes the astronomical illusion.
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