Impact Theory: Is the Past the Key to the Future?
نویسنده
چکیده
T he "impact theory" views the history of life as punctuated by catastrophic mass extinctions caused by the impact of large extraterrestrial bodies, such as comets or asteroids (Fig. 1). The theory was originally developed to explain the well-known catastrophic mass extinctions around the CretaceousTertiary boundary (65 MA) but it has now been extended to explain other apparent mass extinctions through the Phanerozoic (570 MA-present) as well. This is a seductive theory with profound philosophical as well as geological implications; it rightly stands as one of the more controversial theories of this century.
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