The event that leveled many acres of trees 100 years ago in Siberia has long been a mystery. The mystery has now been solved.

The Tunguska explosion in 1908 was rumored to have been caused by some sort of explosive device being tested by Russia, but now scientists know that the trees were knocked down by a comet or asteroid, that exploded in the atmosphere with the force of a thousand atomic bombs. How do they know??They’ve found the crater. It?s now Lake Cheko, which is shallow and bowl-shaped.

In BBC News, Paul Rincon quotes Italian researcher Giuseppe Longo as saying, “We have no positive proof this is an impact crater, but we were able to exclude some other hypotheses, and this led us to our conclusion.”

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