What Existed Before the Universe?

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The Big Bang theory is a widely accepted theory about the creation of the universe. It is a model of the initial conditions and development of the universe that is supported by explanations from scientific evidence and observations. Many cosmologists and physicists believe that there is no such thing as "before the Big Bang" while some have begun to consider the possibility of another universe before ours. A new theory called Loop Quantum Gravity (LQG) has emerged in the past few years, which suggests that our universe stems from the collapse of a previous universe. This has not been proved and scientists are still researching the theory.