The planet nine hypothesis

@article{Batygin2019ThePN,
  title={The planet nine hypothesis},
  author={Konstantin Batygin and Fred C. Adams and Michael E. Brown and Juliette Becker},
  journal={Physics Reports},
  year={2019},
  volume={805},
  pages={1-53}
}
Over the course of the past two decades, observational surveys have unveiled the intricate orbital structure of the Kuiper Belt, a field of icy bodies orbiting the Sun beyond Neptune. In addition to a host of readily-predictable orbital behavior, the emerging census of trans-Neptunian objects displays dynamical phenomena that cannot be accounted for by interactions with the known eight-planet solar system alone. Specifically, explanations for the observed physical clustering of orbits with semi… Expand
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