Eli5: If the concept of time as we understand it didn’t exist before the Big Bang, can the most popular theories be explained to me as to how “all of it” started?
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Space/time are linked in the universe, the farther back you go in time the more closely all of the different forces (gravity, electromagnetic, etc.) get until they are all combined into one unified force.
The theory I’m most familiar with is the big bang wasn’t so much an explosion as a phase change. Think of something like water turning into steam. There was something before the universe as we know it, but right now all anyone can do is speculate about what it was like. This is why the hunt for how to fit the different forces back together comes in. If we can understand the conditions which allow that, we could maybe understand what the universe was like before the big bang.
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