EVEN a cursory glance at Saturn's moon Iapetus reveals it to be an oddball.

甚至只是对于土星的卫星土卫八粗略地一瞥，也足以表露出它的古怪。

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What has happened to Saturn's moon Iapetus?

究竟土星的卫星土卫八发生了什么事？

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The ring may answer the riddle of another moon, Iapetus, which has a bright side and a very dark side.

这道光环也可以解开另一个卫星“土卫八” （Iapetus）的迷团。 “土卫八”一侧发光，另一侧很暗。

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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

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