Saturn’s outermost ring is composed of an unusual combination of fine dust particles occasionally interspersed with rocks the size of soccer balls, scientists reported in the journal Nature. The faint ring, discovered in 2009, is probably made of material ejected from one of Saturn’s moons, Phoebe. With images from NASA’s WISE spacecraft, researchers at the University of Maryland discovered that the ring is dominated by small particles, a rarity in our solar system, while the ring itself is enormous, 10 times as big as the E ring, the next largest.
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