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Science: Fireball over Siberia: 1908

Have the Soviets demystified the big blast that leveled a forest?

An alien spacecraft that exploded while trying to land on earth. A hit by a stray bit of antimatter, or a speeding mini-black hole, or the head of a comet. These are some of the fanciful theories offered over the years to explain the fireball in the sky and the giant explosion that devastated a remote region of Siberia on June 30, 1908, leveling trees for miles around, knocking over huts, stampeding reindeer and creating an enormous shock wave detected around the world.

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