Are periodic bombardments real?

Details Are periodic bombardments real? Are periodic bombardments real?

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990s%26t....79..266w&link_type=abstract

Sky and Telescope (ISSN 0037-6604), vol. 79, March 1990, p. 266-270.

Astronomy and Astrophysics

Astrophysics

1

Comets, Cretaceous-Tertiary Boundary, Nemesis (Star), Periodic Variations, Planetary Craters, Extinction, Impact Damage, Iridium, Meteoritic Composition, Nutation, Earth, Bombardment, Periodicity, Popular, Comets, Asteroids, Impacts, Climate, Cretaceous-Tertiary Event, Extinctions, Impact Effects, Dust, Iridium, Abundance, Hypotheses, Clouds, Ejecta, Cycles, Memesis, Orbits, Eccentricity, Oort Cloud, Gravity Effects, Perturbations, Source, Comet Showers, Earth Crossers, Craters, Diagrams, Stability, Binary

Scientific paper

Consideration is given to the hypothesis that showers of comets or asteroids strike the earth every 26 m yrs, causing climatic castastrophes and mass extinctions (Raup and Sepkoski, 1984). Possible explanations for the alleged periodicity are discussed, including the possibility that the sun has a small faint companion star and perturbations of the Oort cloud as the solar system passes through the Galactic plane. Also, the possible causes of the extinction at the K-T boundary are examined. The implications of these theories are noted and evidence suggesting that impacts do not have periodicity is presented.

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