You can fit a lot of matter into a small space if you get rid of that annoying electromagnetic force. Particles are exceedingly tiny. Mere points of energy spinning very fast. Combine this with spacetime distortions and effectively "infinite density" is very plausible.
The supermassive blackholes at the centers of galaxies probably fit this description. They have BILLIONS of times more mass than the Sun stuffed down into only a few miles of space (from our perspective). Effectively they are small patches of the Universe as it was pre-big bang. Then you have an entire range of them from those huge monsters, to just "plain" blackholes that barely keep themselves scrunched down, to white dwarf's and neutron stars.
The supermassive blackholes at the centers of galaxies probably fit this description. They have BILLIONS of times more mass than the Sun stuffed down into only a few miles of space (from our perspective). Effectively they are small patches of the Universe as it was pre-big bang. Then you have an entire range of them from those huge monsters, to just "plain" blackholes that barely keep themselves scrunched down, to white dwarf's and neutron stars.
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