Terrestrial catastrophism - Nemesis or Galaxy?

Details Terrestrial catastrophism - Nemesis or Galaxy? Terrestrial catastrophism - Nemesis or Galaxy?

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..635c&link_type=abstract

Nature (ISSN 0028-0836), vol. 311, Oct. 18, 1984, p. 635, 636.

Biology

24

Companion Stars, Milky Way Galaxy, Nemesis (Star), Paleobiology, Solar System, Astronomical Models, Hydrogen Clouds, Mass Distribution, Molecular Clouds, Nonequilibrium Conditions, Periodic Variations, Planetary Evolution

Scientific paper

The stability of the proposed sun-Nemesis system, where Nemesis has an aphelion distance of 180,000 AU, is examined. The effect of giant molecular clouds (GMCs) on the stability of the system is studied for three extreme models of GMCs which are likely to encompass all reasonable possibilities: GMCs are uniform throughout their interiors; GMCs do not exist, only molecular clouds; GMCs comprise molecular clouds as substructure. It is shown that the sun-Nemesis system is unlikely to survive the galactic environment for more than two or three revolutions. The somewhat lesser effect on the sun-Nemesis system of the smoothed-out mass distribution of the Galaxy is also addressed.

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