Special & General Relativity Questions and Answers
What prevents densities higher than the so-called Planck Limit from happening?
This density is computed by dividing the Planck Mass by the Planck Volume. The result is a combination of pure physical constants...c...G...h. The numerology of this quantum domain has it that no higher densities are possible because there is no way to create it without it becoming a black hole. The truth is that no one really knows anything about these conditions in any pragmatic way.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.