Titlebook: Comets and the Origin and Evolution of Life; Paul J. Thomas,Christopher F. Chyba,Christopher P. Book 19971st edition Springer Science+Busi

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The Contemporary Hazard of Cometary Impacts, range from about 10 megatons of TNT up to the size of the K/T impactor. The lower threshold for damage is defined by the atmosphere of the Earth, which effectively shields us from smaller projectiles. Up to energies of about a gigaton of TNT, the effects are local or regional for impacts on the lan