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Today, the consensus among scientists, astronomers and cosmologists is that the Universe as we know it was created in a massive explosion that not only created the majority of matter, but the physical laws that govern our ever-expanding cosmos. This is known as The Big Bang Theory.
The big bang theory states that at some time in the distant past there was nothing. A process known as vacuum fluctuation created what astrophysicists call a singularity. From that singularity, which was about the size of a dime, our Universe was born. It is hard to imagine the very beginning of the Universe.Physical laws as we know them did not exist due to the presence of incredibly large amounts of energy, in the form of photons.ventually, however, the expansion will slow, stop, and then the Universe will begin to contract. The contraction will continue until all of the mass of the Universe is contained in a singularity, a process known as the big crunch. The singularity then undergoes a big bang, and the process begins afresh.