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Uhm... its not bullshit. Asteroid impacts are events that have actually happened, and will happen again, eventually. Find a good, detailed picture of the moon, or go outside with a telescope. Look at all the gigantic craters in it. Beleive it or not, if it wernt for erosion and plants to cover it up, Earth would look about the same.
Just in the past year, 2 asteroids have come dangerously close to Earth, and noone even noticed either of them until they had already passed by. About 30 small asteroids (a few meters long) fly into the atmosphere and explode every year.
The odds of a huge asteroid creaming us and causing major damage is pretty slim, but it DOES happen.
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NEW MIX [Feb/March 2008]
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