The dark spots appear on the hemisphere that always faces the moon Charon—the same side that will be invisible when New Horizons makes its closest approach on July 14th. Each one is now estimated to be roughly 300 miles across, and we haven’t a darn clue what they are. But, when this image is combined with composition and color data New Horizons hasn’t yet sent back, the Geology, Geophysics and Imaging team is hopeful it’ll be able to solve the mystery.
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