What prevents scientists from being able model what was before the Big Bang?
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Imagine you saw some footsteps in the snow and you started following them backwards to see where they came from. Now imagine you find out they started in the middle of a field with a bunch of other footsteps, but all of them are pointing outward from the same central point. This is more or less how we know about the big bang in the first place. There could have been footsteps coming into the field before it snowed, or all of the footsteps could have started there from the very beginning, but we don’t have any way of knowing which possibility is true with the currently available information.
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