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Saturn's Glow

Photo: Blue shadow lies over Saturn and its rings

Saturn's rings appear blue in this false-color image taken from Cassini. The planet's northern hemisphere is about twice as bright as its southern hemisphere, because high-level, fine particles are about half as prevalent in the northern hemisphere as in the south. These particles block Saturn's glow more strongly, making it look brighter in the north.

Photograph courtesy NASA/JPL/University of Arizona