Rings of Saturn
Saturn's rings are made up of ice ranging in size from micrometers to meters. They also contain dust and other chemicals.
One theory suggests that the rings were originally a moon whose orbit decayed enough for it to be torn apart by Saturn's immense gravity. Another theory is that the rings were never a moon, rather the same material from which Saturn formed.
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http://www.outerspaceuniverse.org/rings-of-saturn-particles-water-ice.html
http://en.wikipedia.org/wiki/Rings_of_Saturn
