gardenermike writes "Analysis of data from the Cassini probe suggests that Saturn's rings may be billions of years old, rather than the previously surmised millions. Previous research suggested that the rings were young, because of the lack of dark dust accumulation on their surfaces. However, the latest data suggests that the ring surfaces are even younger than previously thought, meaning, ironically, that the rings themselves are much older: they are not static enough to collect dust, but rather are continuously recycling material, with clumps continuously forming and disintegrating."
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