Neptune's capture of its moon Triton in a binary–planet gravitational encounter

@article{Agnor2006NeptunesCO,
  title={Neptune's capture of its moon Triton in a binary–planet gravitational encounter},
  author={Craig Bruce Agnor and Douglas P. Hamilton},
  journal={Nature},
  year={2006},
  volume={441},
  pages={192-194}
}
Triton is Neptune's principal satellite and is by far the largest retrograde satellite in the Solar System (its mass is ∼40 per cent greater than that of Pluto). Its inclined and circular orbit lies between a group of small inner prograde satellites and a number of exterior irregular satellites with both prograde and retrograde orbits. This unusual configuration has led to the belief that Triton originally orbited the Sun before being captured in orbit around Neptune. Existing models for its… 
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TLDR
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The first reconnaissance of all the major planets of the Solar System culminated in the Voyager 2 encounter with Neptune in August 1989. Neptune itself was revealed as a planet with gigantic active
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