Periodic comet showers and planet X

Details Periodic comet showers and planet X Periodic comet showers and planet X

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.313...36w&link_type=abstract

Nature (ISSN 0028-0836), vol. 313, Jan. 3, 1985, p. 36-38.

Astronomy and Astrophysics

Astronomy

32

Comets, Meteoroid Showers, Planetology, Solar System, Astronomical Models, Diffusion Theory, Impact, Periodic Variations, Comets, Planet X, Orbits, Short-Period Comets, Celestial Mechanics, Motion, Origin, Periodicity, Cratering, Perturbations, Calculations

Scientific paper

The discovery that Pluto's mass is insufficient to explain the discrepancies in the motions of the outer planets has led to the prediction of a tenth planet (planet X) of mass about 1-5 earth masses beyond the orbit of Pluto. Further, the existence of a belt or disk of comets beyond the orbit of Neptune has been proposed in connection with some theories of the origin of the Solar System as a possible source of short-period comets and indirectly as a source of long-period comets. Here it is pointed out that the existence of both planet X and the comet disk at their expected distances may explain not only the observed planetary motions and the origin of comets, but also the recently reported 28-Myr periodicity in terrestrial cratering and in mass extinctions. The cratering period is associated with the precession of the perihelion of planet X caused by the perturbations of the outer planets.

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