fenimor writes "Saturn, the sixth planet from the Sun, is probably best known for its famous planetary rings. They extend from 6,630 km to 120,700 km above Saturn's equator, and are composed of silica rock, iron oxide, and ice particles. A massive eruption of atomic oxygen from Saturn's outer rings, seen by Cassini's ultraviolet camera, may be an indication that the planet's wispy E ring is eroding so fast that it could disappear within 100 million years if not replenished."
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