这个发现给土卫八之谜提供了一个可能的解释。
The discovery offers a possible solution to the mystery of the moon Iapetus.
有半边的土卫八已经暗到即使从地球观看，还是几乎消失的样子。
Half of Iapetus is so dark that it can nearly disappear when viewed from Earth.
有半边的土卫八已经暗到即使从地球观看，还是几乎消失的样子。
Half of Iapetus is so dark that it can nearly disappear when viewed from Earth.
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