New Horizons: Past Pluto, Outward Bound
Pluto and Charon don't have nearly as many craters as scientists expected. One patch, at least, seems to be very new, on the cosmic time scale. Something, maybe Pluto's equivalent of volcanic eruptions, resurfaced that terrain in the last 100,000,000 years.
There's something odd about Charon's north polar region, too. Interesting, anyway.
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