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The biggest moon of Neptune is extremely cold (34 kelvin). Triton has icy volcanoes spitting methane and nitrogen. Furthermore it is the only big moon orbiting clockwise around its planet. Probably is hasn't formed together with Neptune, but got captured by this some time later.

Distance to Neptune: 354 760 km
Mass: 2.14 * 1022 kg
Diameter: 2700 km
Orbit period: 5.88 days

Back: List of the Moons, Neptune Moons
Photo: Nasa

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