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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.
What force do scientists think was responsible for clumping matter together to form the first stars after the Big Bang? gravity, acting upon anisotropies in the distribution of matter caused by quantum fluctuations inflated to cosmological scale by the rapid inflation of the universe. Not directly. Scientists are not sure of the conditions immediately after the Big Bang, which (we believe) created the universe.   gravity. Gravity.