Penrose white-holes would like a word. Though they might just be mathematical abstracts and not "real". https://en.m.wikipedia.org/wiki/White_hole https://en.

Penrose white-holes would like a word. Though they might just be mathematical abstracts and not "real". https://en.m.wikipedia.org/wiki/White_hole https://en.m.wikipedia.org/wiki/White_hole https://physics.stackexchange.com/questions/740527/penrose-diagram-of-hypothetical-astrophysical-white-hole https://physics.stackexchange.com/questions/740527/penrose-d...