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Image of Triton
TRITON: Triton is the largest by far of Neptune’s 13 known moons. This beautiful portrait of Triton is a false-color mosaic taken in 1989 by NASA’s Voyager 2 spacecraft. It is 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). It’s frozen surface is made mainly of nitrogen ice, with some methane ice at the south pole. Voyager 2 observed some active geyser-like plumes erupting from the surface, perhaps like those active now on Saturn’s moon Enceladus. Like Phoebe’s orbit around Saturn, Triton orbits Neptune in the opposite direction than the orbits of most objects in the Solar System. Image Credit: NASA/JPL/USGS
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