All planetesimals born near the Kuiper belt formed as binaries

@article{Fraser2017AllPB,
  title={All planetesimals born near the Kuiper belt formed as binaries},
  author={Wesley C. Fraser and Michele T. Bannister and Rosemary E. Pike and Micha{\"e}l Marsset and Megan E. Schwamb and JJ. Kavelaars and Pedro Lacerda and David Nesvornyy and Kathryn Volk and Audrey C. Delsanti and Susan D. Benecchi and Matthew J. Lehner and Keith S. Noll and Brett J. Gladman and J. M. Petit and Stephen D. J. Gwyn and Ying-Tung Chen and Shiang‐Yu Wang and Mike Alexandersen and Todd W. Burdullis and Scott S. Sheppard and Chadwick A. Trujillo},
  journal={Nature Astronomy},
  year={2017},
  volume={1},
  pages={0088}
}
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The observed transneptunian binaries, with components of comparable mass and large separations, cannot be the result of collisions in the present dynamical environment of the Kuiper belt. They could

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