Biology
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..636h&link_type=abstract
Nature (ISSN 0028-0836), vol. 311, Oct. 18, 1984, p. 636-638.
Biology
25
Comets, Companion Stars, Nemesis (Star), Paleobiology, Perihelions, Stellar Mass, Stellar Rotation, Molecular Clouds, Motion Stability, Orbit Perturbation, Orbital Elements, Solar System
Scientific paper
It has been suggested that the observed periodic extinction of species at intervals of 26 Myr may be catalysed by a hypothetical stellar companion of the Sun, Nemesis, with an orbital period of 26 Myr. This letter investigates the effect of Nemesis on the comets in the inner comet cloud. This is used to determine the minimum required mass of Nemesis and its minimum required perihelion distance. The effect of passing stars on the stability of the orbit of Nemesis is investigated, and the probability of its having passed within the planetary system estimated.
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