Most scientific theories are merely suppositions and unproven hypotheses.
There are as many, if not more scientific theories as to the origin of our universe, as there are differing religious bodies, such as Christianity, Hindu, Abrahamic, Muslim, etc.
One of which, is a theory put forward by Niayesh Afshordi, an astrophysicist with Perimeter Institute for Theoretical Physics in Canada, which he believes, could explain the singularity within a Super massive Black Hole, from which singularity our ‘Three Dimensional’ Universe was born.
Niayesh Afshordi, proposes that our three-dimensional universe floats as a membrane in a “bulk universe” that has four dimensions and that the “Bulk Universe” has four dimensional stars, which go through the same life cycles as our three-dimensional stars.
The most massive ones explode as supernovae, and their central core collapses into a black hole, (As a Singularity) like in our universe, only in four-dimension. The four-dimensional black hole has its own four dimensional “Event Horizon,” the boundary between the inside and the outside of a black hole.
In a three-dimensional universe, the event horizon appears to be two dimensional. In a four-dimensional universe, it appears to be three dimensional. The four-dimensional black hole, then blows apart, (THE BIG BANG) with the leftover material forming a three-dimensional membrane surrounding a ‘Three Dimensional’ event horizon, which expands---and is essentially our universe.
So, according to the theory proposed by Niayesh Afshordi, our universe is the vomited-up guts of a Super massive fourth dimensional black hole, in which the singularity that is said to have been the origin of our three dimensional universe, had been crushed. The expansion of the event horizon explains our universe's expansion; the fact that its creation stems from another 4D universe explains the weird temperature uniformity.
As attractive as Niayesh Afshordi’s theory is, I will continue to believe in the eternal oscillating universe, which is the evolution of the eternal energy that has neither beginning or end, and that each stage of its activity is a separate generation, and each generation of its eternal evolution, occupies its own position in Space-Time.
As the scriptures state that God gathers all creation back to himself, before creating for us a new heavens and a new earth, (A new universe) I will continue to believe, that this entire universe, which began as a ‘singularity,’ will burn up and fall as fire into the Great Abyss, which is created by the black holes within the condensing Galaxies devouring each other, where it will be crushed back into the singularity from which it was created, only to be blasted out and resurrected to continue on in its eternal process of evolution.