The Big Bang Theory is by far the most accepted theory surrounding the origin of our universe - but it's not perfect. Here are 5 unsolved mysteries surrounding the Big Bang.
From the concepts of George Lemaitre and Edwin Hubble, the Big Bang Theory developed to explain the expansion of our universe, the development of the four fundamental forces and the standard model of particle physics.
Another theory, called Ekpyrotic Theory, attempts to explain the holes in the Big Bang Theory by merging general relativity with string theory.