The Many Moons of Saturn
NASA's Cassini probe flies by a Saturn moon.
Setting Your Sights on Saturn
The green image is Saturn's moon Hyperion as seen by an ultraviolet camera. The black-and-white picture is what your eye would see. Scientists say this frozen moon is "spongy," made of porous, low-density rock. Some of the white spots in the ultraviolet image are frozen water. (NASA/JPL/University of Colorado/Space Science Institute)
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