The Hazard to Civilization from Fireballs and Comets
OXFORD UNIV (UNITED KINGDOM) DEPT OF ASTROPHYSICS
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Asteroids which pass close to the Earth have been fully recognized by mankind for only about 20 years. The present report, then, is concerned with those other celestial bodies recorded by mankind since the dawn of civilization which either miss or impinge upon the Earth and which have also been despised. Now known respectively as comets 1 kilometer in size and meteoroids 10 meters in size, it is the fireballs or signs produced by these meteoroids when they encounter the atmosphere which have generally been the greatest source of concern.