Look How Tiny Saturn's Moon Prometheus Is

Look How Tiny Saturn's Moon Prometheus Is

This may just be another glorious picture of Saturn's rings — but it also serves to show just how large the planet is. Can you make out its moon Prometheus in the image?

Down in the lower left-hand corner, there's a bright white spot. It's not a broken pixel on your screen, but Saturn's moon, Prometheus. Discovered in 1980, the small, elongated moon — it measures 136km along one axis, but only 79 and 59 along the other — orbits the planet just within Saturn's outermost F ring. Thought to be a porous, icy body, it's actually small enough that its orbit is strongly influenced by nearby rings and moons. [NASA]


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