Giant Comets, Evolution and Civilization
OXFORD UNIV (UNITED KINGDOM) DEPT OF PHYSICS
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Climatic cycles, ice epochs, mass extinctions and other global disturbances may be attributed to episodes of bombardment by giant comets. Such bodies now in chaotic orbits beyond Jupiter present the most serious current celestial hazard. A point at issue is the greater complexity of the cometary as opposed to the asteroidal hazard, as well as its more pervasive effects.