Tuesday, November 17, 2009


Two-tone moon
Dark dust coats half of a Saturnian moon named Iapetus, as seen in this photo captured by the Cassini orbiter in September 2007. In the Oct. 8 issue of Nature, researchers suggested that the source of the dust was a nearly invisible ring of debris kicked off from another moon, Phoebe. The ring starts about 3.7 million miles away from Saturn and extends outward another 7.4 million miles.

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