Talk:Meta-Existence/@comment-4867780-20200204011253

Technically, the Big Bang only turned an hyper-concentrated all-in-one into a huge bubble of mostly empty space, without actually filling anything (quite the opposite if you compare the before/after states).

And seeing as its expansion seems to be growing ever-slower over time, possibly/probably followed by a regressive dynamic back to the all-in-one, I wouldn't call it quite "irreversible" either.