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Can a large mass be imploded with a nuclear explosive to form a small black whole? If so, is it economically feasible with today's technology?

Even nuclear explosives are not nearly powerful enough to make black holes out of human-scale pieces of matter, and the smaller the piece of matter you are trying to implode, the harder it gets (because the Schwarzchild radius shrinks so fast). The only easy way to make them is to start with huge star-size quantities of matter - any technology on that scale is of course "astronomically" expensive relative to our current capabilities.

Arthur Smith

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