How could the universe be formed by energy if there was nothing before the universe?
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We have some confidence about what happened down to trillionths of a second after the Big Bang, because we either know or can make educated guesses about how energy and matter behave at extreme energy/temperature/pressure, but we don’t know, and may never know, why it happened/where the energy came from/what existed before. This is because 1) as far as we know no information was passed into the current universe from whatever May or may not have existed previously and 2) we don’t know what could cause a big bang to happen.
Relevant PBS Spacetime
There is no evidence that there was a time before the universe when nothing existed. The Big Bang theory describes the universe’s rapid expansion from a uniformly hot dense state, not the universe appearing out of nothing. We don’t know what came before that, at least not yet. If time came into existence with the Big Bang, then the universe already existed at the first moment in time and there simply is no “before.”
The universe existed in a highly dense, extremely hot compacted state. A singularity in which time and space are undefinable. The universe as we know it was created by the Big Bang from this initial state. That’s our best (simple) understanding as of now.
We don’t know what formed or created the universe. All we know is that in the beginning, all of the matter and energy in the universe was in one spot, which exploded (more or less).
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