Latest dispatch from Pluto reveals frozen plains, icy hills and more

New images give shape to moon Nix and hint at dwarf planet’s geology

close-up of Pluto's surface

PLUTO’S PLAINS  A craterless plain etched by a network of shallow troughs lies within Pluto’s “heart,” as seen in this image taken July 14 when New Horizons was 77,000 kilometers from the dwarf planet. 


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