Narrative Report on the Hazard to Civilization Due to Fireballs and Comets
OXFORD UNIV (UNITED KINGDOM) DEPT OF PHYSICS
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The 100,000 year average interval between asteroid strikes Chapman Morrison 1994 first became apparent during the 1970s. Another discovery of considerable moment about this time was that of object Chiron. Considered to be a giant comet and found to be moving in a chaotic orbit beyond Saturn close to the ecliptic Kowal l979,Oikawa Everhart 1978, the possibility of its future transfer to a more stable sub-Jovian orbit capable of penetrating near-Earth space and hence threatening the Earth was also soon recognized Bailey et al 1994, Steel et al 1994. The report then is by way of being a flier delineating the current state of research historical and scientific concerning the cometary and fireball threat.