MIRROR. “It is interesting that one may also consider the possibility of the time reversal of a BH…which has opposite properties to that of a BH, and is allowed by (that is consistent with and follows from the mathematics of) GR theory, referred to as a White Hole (WH).”(BH = black hole; GR = General Relativity).
https://link.springer.com/chapter/10.1007/978-3-030-51081-7_62