Please correct me if I’m wrong in understanding big bang, I understood that there was nothing in the beginning and everything was formed all at once, hence the light from the farthest will take billions of years to reach us to see it’s present moment and so why is matter limited, honestly feels like a computer simulation since everything is limited in nature.
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> I understood that there was nothing in the beginning and everything was formed all at once
We don’t know what was there “before the big bang” (which is already ill defined because the big bang is the beginning of time as we know it), but having the universe being created ex-nihilo creates more problems than solves.
So there most probably was something that caused the Big Bang, the universe as it is today probably didn’t just “appear out of nothing”. What that was and what laws of physics did it obey? Was there time, the way we describe and think about it now? Maybe, maybe not.
But “we don’t know” is a far cry away from “there was nothing”.
Regarding the rest of your question, I don’t know, but we can’t actually see light as far back as the big bang, because the universe was opaque at the time and no light from before then has been allowed to reach us without being intercepted by something else.
The first time this has happened is at so called recombination, which happened ~380,000 years after the big bang. At that point the universe was infinite and since light travels at a finite speed, we can’t see further away than that.
As time goes by, light from the moment of recombination we see comes from further and further away, because more and more time has passed.
That’s why we can only see a finite part of the universe and it’s getting bigger as time goes by.
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