Dynamical constraints on the mass and perihelion distance of Nemesis and the stability of its orbit

@article{Hills1984DynamicalCO,
  title={Dynamical constraints on the mass and perihelion distance of Nemesis and the stability of its orbit},
  author={J. Hills},
  journal={Nature},
  year={1984},
  volume={311},
  pages={636-638}
}
It has been suggested1,2 that the observed periodic extinction of species at intervals of 26 Myr (ref. 3) may be catalysed by a hypothetical stellar companion of the Sun, Nemesis, with an orbital period of 26 Myr. The passage of a stellar companion through the inner comet cloud4 will fill the loss cone of these comets and cause a comet shower to enter the planetary system. It has been estimated that about 20–30 comets will hit the Earth during a shower, which lasts less than a million yr. Such… Expand
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