well actually this is my area of love
I am more into micro vs macro but
In theory every star, can turn into a black hole, and a huge one is in the middle of our universe.
Each one of these black holes sucks in stuff as you know, even light (but yes things do escape see hawkin's recant on nothing can escape a black hole as he found radiation and particles un-pair and escape)
after the collapse of these holes IMO and many others they blow up into another big bang somewhere sometime else
creating another universe, its not a parallel one to us, as in it wont have dupes of us like sliders or some black mirror episode.
but thats the theory
I also believe that WITHIN our own universe and to each person and thing living or not there are multiple versions of ourselves (kinda like the movie THE ONE) with jet lee, only in some you dont marry or died at birth never born etc)
hugs to gravity still being a theory
on a digression, we are overdue for a polar shift, so get ready UK, the new south pole is supposed to be off the west coast of england. oo my