On the Origin of the Pluto System

  title={On the Origin of the Pluto System},
  author={Robin M. Canup and Kaitlin M. Kratter and Marc Neveu},
For six decades following its discovery, Pluto was the only known Sun-orbiting world in the dynamical vicinity of Neptune. An early origin concept postulated that Neptune originally had two large moons — Pluto and Neptune’s current moon, Triton — and that a dynamical event had both reversed the sense of Triton’s orbit relative to Neptune’s rotation and ejected Pluto onto its current heliocentric orbit (Lyttleton, 1936). This scenario remained in contention following the discovery of Charon, as… 
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