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The outermost ring lies in a forbidden zone: where, by the rules, moons should be born, not rings assemble.
Gravitational forces no longer tear the dust apart, allowing it to clump together. Why we see another hoop instead of a moon is unknown. Nearby — a dust disk and a tiny object off to the side: likely a moon embryo.
Chiron is only the fourth small world with rings, and its icy round dance turned out to be inconstant.
Comparing images over 30 years showed: the rings are changing. Today we see a new planetary system, of snow and stones, coiling around the icy wanderer.
