Triton, Neptune's largest moon, was probably part of a two-body object similar to the Pluto–Charon system. This tandem might have been ripped apart when it strayed too close to the planet that Triton is now orbiting.
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Morbidelli, A. Interplanetary kidnap. Nature 441, 162–163 (2006). https://doi.org/10.1038/441162a
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