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Originally posted by nomadros
...that is one big pole
photojournal.jpl.nasa.gov...
In many places, the dark material--thought to be composed of nitrogen-bearing organic compounds called cyanides, hydrated minerals and other carbonaceous minerals--appears to coat equator-facing slopes and crater floors. The distribution of this material and variations in the color of the bright material across the trailing hemisphere will be crucial clues to understanding the origin of Iapetus' peculiar bright-dark dual personality.
Originally posted by nomadros
reply to post by seagull
Thanks.
The only thing I can think of (naturally) is that a meteor hit, punched through the surface and a plume of liquid something shot out (similar to a drop of water falling into a pool) and then froze.