This may be condensed matter physics topic, but I'm looking for a layperson answer. Scares of the CERN accelerator creating a black hole that swallows Earth are in the news once again. https://www.newsweek.com/earth-shrunk-tiny-hyperdense-sphere-particle-accelerators-1145940 From 10 years ago: https://www.newscientist.com/article/dn13555-particle-smasher-not-a-threat-to-the-earth/ I know it is not possible for an accelerator to produce such a black hole in practice. But surely it's impossible even in principle. Surely, a particle accelerator creating a tiny black hole that could grow to swallow the Earth would violate the law of conservation of energy. Whatever object was created would only have as much energy in it as was supplied. I mean, you can't have a free lunch here. Contrarily, an atom bomb brings atoms together that already have energy in the form of bonds that hold the heavy elements together; all the bomb is doing is releasing that energy. Where would a tiny black hole get the energy to destroy the Earth? Is it a wholly exothermic phenomenon? i.e. the energy is already there in the atoms, and a particle accelerator is simply releasing it, allowing atoms to fall together and coalesce at the singularity? The implication of that is that all mass exists in a state of instability, on one side of an "energy hill" - the hill preventing it from collapsing into a BH - and all we have to do is just crush it enough to release that inherent energy? That seems wrong. Again, contrarily, the universe can make black holes easily enough because it is effectively an open system; there is always enough energy, and occasionally a whole bunch of it can end up in one place. Is my thinking sound?