Triton
MOON · orbits Neptune, backwards
Neptune's big moon orbits the wrong way around, which gives away its secret: Triton did not form here. It is a captured world from the Kuiper belt, a cousin of Pluto. Dark geysers of nitrogen gas erupt through its pink ice. Triton is slowly spiraling inward, and far in the future Neptune's gravity will tear it into a spectacular ring.
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