Tunguska: the explosion of a stony asteroid. (atmospheric explosion near Tunguska River in Siberia)

Science News | January 9, 1993| | Copyright

On the morning of June 30, 1908, an enormous fireball streaked across the sky over the Siberian wilderness. The tremendous atmospheric explosion that followed released enough energy to flatten and char trees over an area 60 kilometers wide near the Tunguska River. But the blast left no crater.

Explanations of this cataclysm have ranged from an encounter with a lump of antimatter or a miniature black hole to the entry into Earth's atmosphere of a "puffball" comet or an asteroid. Now Christopher F. Chyba of NASA's Ames Research Center in Mountain View, Calif., and his ...

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