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Moons of the Solar System

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Triton


Neptune's main moon is one of the coldest places in our solar system. It's so cold on Triton that even nitrogen freezes and sits as ice on the surface.

Fun Fact: Triton orbits Neptune in the opposite direction of that planet's rotation. This is called a retrograde orbit. Triton is the only large moon in the solar system with a retrograde orbit around its planet, leading scientists to believe that Triton formed elsewhere and was captured by Neptune's gravity long ago. Photo source: NASA

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