Mathematics – Probability
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.317..338s&link_type=abstract
Nature (ISSN 0028-0836), vol. 317, Sept. 26, 1985, p. 338-341.
Mathematics
Probability
16
Galactic Rotation, Planetary Craters, Solar Oscillations, Solar System, Early Stars, Earth Surface, Molecular Clouds, Normal Density Functions, Poisson Equation
Scientific paper
Impact cratering on the Earth over the past 600 Myr has been partly sporadic, partly episodic. The episodic component is suspected to have been cyclical, with a mean period of ≡32 Myr. According to a theory proposed to explain this phenomenon gravitational encounters between the Solar System and interstellar clouds of intermediate to large size occasionally disturb the outer Solar System comets, with the consequence that some of these comets fall into the inner regions of the system, where a few hit the Earth. A new study of the observational evidence is presented. Contrary to a claim by Thaddeus and Chanan, the vertical scale height of the interstellar clouds seems to be sufficiently small and the Sun's vertical trajectory sufficiently large for the modulating effect of the Sun's galactovertical motion to be detectable in the terrestrial record of impact cratering with at least a 50% a priori probability.
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