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Admitted I know very little about QM, but I've been thinking about black holes and I wondered if there would be an upper limit to density of an object of the smallest size allowable if the particles are not being observed by anyone (since black holes are black)? I ignorantly wondered that classically perhaps even though an atom is 99.99% empty space or so there seemly would be a logical upper limit to the density of an object because 0.01% of that atom is not empty but in QM all is waves and probability so this might not be the case here. Please make your answers understandable (I've taken a standard 3 semester sequence course of physics and math through analysis). Thanks for your time physicists, hope you don't mind a noob question.