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Triton is the largest moon of planet Neptune and one of only three objects in the Solar System known to have a nitrogen-dominated atmosphere (the others are Earth and Saturn's moon Titan). Triton's surface is so cold that most of the nitrogen is condensed as frost. The dark streaks are believed to be an icy and perhaps carbonaceous dust deposited from huge active geyser-like plumes.

CREDIT: NASA/JPL/USGS.

Source:
http://photojournal.jpl.nasa.gov/catalog/PIA00317