On June 30,1908, a giant fireball exploded in Siberia's remote Tunguska region, leveling trees for more than 20 miles around and causing atmospheric shock waves that were detected round the world. At the time, scientists thought that a giant meteorite had crashed into the earth. Later, when they failed to find a major crater or clearly identifiable meteorite fragments at the site, they began to question their earlier theory.
Many scientists have since attributed the phenomenon to a comet head that exploded in the air before hitting the earth. Others suggest that a stray clump of antimatter from elsewhere in the universe...
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