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In 1973, Albert A. Jackson and Michael P. Ryan, physicists at the University of Texas, proposed that the Tunguska event was caused by a small (around 1017 kg to 1019 kg) black hole passing through the Earth. This hypothesis is flawed, as there was no so-called exit event....
Flawed? Maybe not: it's orbiting under our feet, happily gobbling away at the planet!
Oh that thing, how awesomely creepy. I can't believe there wasn't an "In Search Of" on this that scared little me to death. Must of been something of the same 70's Madness Mystery genre.