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This is Scientific American's 60-Second Space, I'm John Matson. Got a minute?

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Saturn's rings and moons are a diverse group,

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but some of their differences are only skin deep.

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A new analysis of the Saturnian system shows that the planet's rings and satellites have at least one compositional characteristic in common.

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They appear uniformly stocked with water ice, dating from their formation in the early solar system.

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Researchers examined six years of Saturn observations from NASA's Cassini orbiter,

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which can detect ice as well as the colorful contaminants that obscure it, such as iron or hydrocarbons.

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The inner moons are largely devoid of such coloration, thanks to a fresh coat of icy material that spews out from the moon Enceladus.

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And the outer moons are dusted with dark stuff, which looks to be debris from Phoebe, a dark-colored lump of a moon.

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But underneath those surface differences is a uniform distribution of water ice,

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which seems to reflect the common origins of the moons and rings billions of years ago.

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The research appears in the Astrophysical Journal.

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The rings and moons, polluted and tinted though they may be now,

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therefore appear to preserve a record of their beginnings, frozen in time and space.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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