Canadian astrophysicist Niayesh Afshordi and his colleagues have turned to an idea first proposed 13 years ago. In that model, our 3D universe is merely a membrane- also known as a brane- floating through a 4D “bulk universe.”
There could be a gaping hole in the Big Bang theory. Or rather, a giant, colossal black-hole caused by the collapse of a four-dimensional star. One of the main problems with the Big Bang is that the temperature of the universe is nearly uniform.