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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 at about 13.7 billion years ago all matter was concentrated in an extremely dense and uniform clump of matter-energy. The expansion of space pushed individual units of matter-energy apart until the universe was spread out and cool enough to cool and form into the galaxies we know today.