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Charon, Pluto's largest moon and its newly discovered anomaly.
Charon, Pluto's largest moon and its newly discovered anomaly.
In the image, which focuses on an area approximately 240 miles from top to bottom, few craters are seen, suggesting that recent geological activity may have reshaped Charon's surface.
The mountain in a moat, seen in the top left hand corner of the image, was described as "intriguing" by Jeff Moore, from Nasa's Ames Research Centre. Moore, who is leads New Horizons' geology and geophysics imaging team, said the feature had left his colleagues "stunned and stumped".
A rectangle superimposed on the surface of Charon shows the approximate position of the closeup, with the mountain still clearly visible.
New Horizons captured the image from a distance of around 49,000 miles, an hour and a half before its closest approach to Pluto on Tuesday.
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Notice the darker line coming down and intersecting with other dark lines and small craters.