Mass extinctions and missing matter

Details Mass extinctions and missing matter Mass extinctions and missing matter

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311...17s&link_type=abstract

Nature (ISSN 0028-0836), vol. 311, Sept. 6, 1984, p. 17.

Mathematics

Logic

5

Biological Evolution, Celestial Mechanics, Comets, Galactic Structure, Mass Distribution, Solar System, Milky Way Galaxy, Molecular Clouds, Perturbation, Stellar Evolution

Scientific paper

The possible influence of 'invisible matter' on the solar system's comet halo, and therefore on quasi-periodic cometary bombardment of the earth and consequent mass extinctions, is briefly addressed. Invisible matter consisting of small or cold interstellar molecular clouds could significantly modulate the comet background flux, while invisible matter consisting of a large population of old, dead stars with a relatively small galactic concentration probably could not. It is also shown that the downward force exerted by the Galaxy will perturb the halo, but will not produce any periodicity.

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