This image of Saturn's icy moon Enceladus taken by the late great Cassini probe is interesting because of the light. That crescent of brightness on the right is from the sun, but if you look at the shadows you can see that there's another, less intense, light source on the left. That light is coming from Saturn itself, reflecting sunlight back onto its moon like a giant mirror.
Image Credit: NASA; ESA, JPL, Cassini Imaging Team, SSI; Color Composite: Gordan Ugarkovic
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