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Astronomy

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  • $\begingroup$ I think a black hole can only become asymptotically close to equilibrium, not ever reach it, due to the expansion of the universe constantly lowering the temperature of the background radiation. That would still mean a time reversed black hole is still a white hole. That said, we have no evidence that white holes exist at all. $\endgroup$
    – Asher
    Commented May 18, 2017 at 7:25
  • $\begingroup$ This is rather unclear. It seems to contain a quote from Wikipedia, but I can't find the original. Is it your translation of a non-English Wikipedia? I don't understand how you deduce that a white hole must be inside, or behind a black hole. I don't understand why you think a white hole would exist before the big bang. In practical terms, white holes don't exist, just as negative mass matter doesn't exist. $\endgroup$
    – James K
    Commented May 18, 2017 at 19:26