Science: Whew! That Was Close

Earth's narrowest escape from an asteroid in 52 years

Where were you on the night of March 23? Out dancing, perhaps, or attending a PTA meeting or just sitting at home watching L.A. Law? If so, you did not realize how close you came to disaster. While you were blissfully unaware of the danger, a huge asteroid whizzed past the earth, coming closer than any other such heavenly body seen in 52 years. If the giant clump of rock -- half a mile across by one estimate -- had hit the planet, it would have packed the wallop of thousands of H-bombs and possibly killed millions of people. If it...

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