Synthetic aperture radar on the Cassini probe has shown the surface of Saturn's moon Enceladus is extremely rough and crisscrossed by grooves in the ice, some of which are wide and deep and many miles long. It has also shown a particularly shiny region on the surface that scientists can't yet explain.
This is especially peculiar because Saturn's huge moon Titan-- a world very different from Enceladus-- also has a shiny region. That one is in the foothills of a mountain range. Whether the two could have the same cause is unclear.
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