Origin and Evolution of the Cometary Reservoirs

@article{Dones2014OriginAE,
  title={Origin and Evolution of the Cometary Reservoirs},
  author={Luke Dones and Ramon Brasser and Nathan A. Kaib and Hans Rickman},
  journal={Space Science Reviews},
  year={2014},
  volume={197},
  pages={191-269}
}
Comets have three known reservoirs: the roughly spherical Oort Cloud (for long-period comets), the flattened Kuiper Belt (for ecliptic comets), and, surprisingly, the asteroid belt (for main-belt comets). Comets in the Oort Cloud were thought to have formed in the region of the giant planets and then placed in quasi-stable orbits at distances of thousands or tens of thousands of AU through the gravitational effects of the planets and the Galaxy. The planets were long assumed to have formed in… 

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