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From Geotimes:
On June 30, 1908, a ball of fire streaked across the sky in Siberia,
then exploded between five and 10 kilometers above Earth. The explosion
was so bright that it lit up the night sky across Europe and Central
Asia. The resulting shockwaves stripped all of the branches from the
trees directly below and flattened trees in a 2,000-square-kilometer
area around the epicenter. The explosion, now called the Tunguska Event
after the region where it occurred, resulted from the collision of a
cosmic object with Earth. When the object exploded, debris should have
rained down and an impact crater should have formed. Yet no
scientifically reliable evidence of this explosion has been found —
until now.
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