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Tunguska explosionindy100
•75% Informative
A giant explosion that shook part of Russia more than a century ago has never been categorically explained.
Some scientists believe it could have been caused by a primordial black hole passing through the Earth .
The phenomenon flattened around 800 square miles ( 2,000 square kilometres ) of the surrounding land an area larger than London .
The most puzzling aspect of the whole occurrence was that no crater was left behind.
Experts suggest primordial black hole could have left an exit wound on the other side of the world.
No such evidence has since been found, but experts suggest it could have followed a straight line through the Earth .
A Tunguska -type event is only expected to occur, on average, once every century.
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