Been reading up on the theoretical multi universe.
The basic princible of this theory is that there has always been a universe, that nothing or anything has ever existed before and that new universes bubble out from existing ones. So, our universe was created by another universe. Some astrophysicists speculate that this story is written in the relic radiation left over from the big bang: the cosmic microwave background.
Then the string theory.... it supports the idea of a cyclical universe,. It surmises that new matter and energy spring into existence every trillion years when two extra-dimensional membranes, or branes, collide in a zone outside our universe.
I don't pretend to understand all the science behind it but i like the idea of universes giving birth to knew ones.