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Worldbuilding

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    $\begingroup$ It can be tiny but it can't be too tiny "So, for instance, a 1-second-life black hole has a mass of 2.28×105 kg, equivalent to an energy of 2.05×1022 J that could be released by 5×106 megatons of TNT." en.wikipedia.org/wiki/Hawking_radiation $\endgroup$
    – Slarty
    Commented Dec 21, 2017 at 20:57
  • $\begingroup$ "nothing rules out super dense, but not very massive, material from existing in the universe." — sorry, but that's just not true. @Slarty explains why black hole has its limits, but our understanding of quantum & particle physics also puts some limits on non-blackhole matter. $\endgroup$
    – Mołot
    Commented Dec 21, 2017 at 22:53
  • $\begingroup$ 2,28E+05 kg is about 228 metric tons, right? $\endgroup$
    – James McLellan
    Commented Dec 22, 2017 at 0:15
  • $\begingroup$ @JamesMcLellan yes correct and if memory serves from another question a 600 ton black hole would last about 20 sec. So as I said it can't be too tiny mass wise. Although obviously all of these black holes would be submicroscopic $\endgroup$
    – Slarty
    Commented Dec 22, 2017 at 11:01