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In the case of Iapetus it is a ridge around the moon's equator, clearly visible in the photograph.
ECONOMIST: Those space probes in full
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Observations of the material coating the dark face of Iapetus indicate it has a similar composition to the surface material on Phoebe.
BBC: New ring detected around Saturn
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The discovery would appear to resolve a longstanding mystery in planetary science: why the walnut-shaped Iapetus has a two-tone complexion, with one side of the moon significantly darker than the other.
BBC: New ring detected around Saturn