Science: Big Burn

Astronomers take the atomic bomb in stride. They know there are more terrible ways in which this planet might be destroyed. Last week Astronomer Robert Coles of the Hayden Planetarium summed up, in Sky and Telescope the latest "astronomical facts concerning the end of the world": About a ton of pulverized meteorites fall on the earth's surface each day, do no damage. But, points out Coles, the famed 1908 meteorite that fell in northern Siberia showed what a meteor could do. It knocked forests flat for 30 miles, blew a man off his doorstep 50 miles away. Its roar was heard...

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