Potential for Earth Strikes by Large Asteroids
The statistical chance of a large asteroid striking the Earth in any given year is very small–in fact almost statistically insignificant–since such events occur on average only once in more than 10,000 years. However, the consequences if such an event were to occur would be tremendous–perhaps even an “extinction level event.” Recent advances in astronomy have led to the realization that a large number of Near-Earth Objects (NEOs) that have true “Earth-crossing” orbits was far greater than was originally estimated. See: http://cfa-www.harvard.edu/cfa/ps/mpc.html The Tunguska, Siberia event in 1908 and the Curucá incident in Brazil in 1930 (in both of which …