There are some hypothesis that the universe might be the inside of black hole from a parent universe: https://en.wikipedia.org/wiki/White_hole#Big_Bang/Superma

There are some hypothesis that the universe might be the inside of black hole from a parent universe: https://en.wikipedia.org/wiki/White_hole#Big_Bang/Supermassive_White_Hole https://en.wikipedia.org/wiki/White_hole#Big_Bang/Supermassi... https://en.wikipedia.org/wiki/Black_hole_cosmology https://en.wikipedia.org/wiki/Black_hole_cosmology https://en.wikipedia.org/wiki/Cosmological_natural_selection https://en.wikipedia.org/wiki/Cosmological_natural_selection