We know there was a quick expansion of space and time, but we have no idea what caused it. So... what do you think?
The Big Bang theory is the leading explanation of how the universe began almost 14 billion years ago. The theory suggests that the universe as we know it started with an expansion of space caused by an infinite amount of density. The Big Bang model assumes the existence of energy, time, and space, but does not comment about their origin or the cause of the dense and high temperature initial stage of the universe.
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