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2014-01-14. Dr. Ed Lu: Protecting Earth from Asteroids - Why We May Not See Them Coming.

posted May 11, 2014, 9:34 PM by Alan Gould

For GSS A Changing Cosmos chapter 7. Excerpt: ...more than a million “near-Earth asteroids” are larger than the asteroid that struck Tunguska, Siberia, in 1908 – and about 1,000 times more powerful than the atomic bomb dropped on Hiroshima. The 1908 asteroid was only about 40 meters across, yet it destroyed an area roughly the size of the San Francisco Bay Area. Nature magazine has just reported that “the risk of similar objects hitting our planet may be ten times larger than previously thought. Hear Dr. Lu's lecture....  http://www.commonwealthclub.org/events/2014-01-14/dr-ed-lu-protecting-earth-asteroids-why-we-may-not-see-them-coming.  Public lecture at The Commonwealth Club.