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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We actually don’t know if the universe is infinite or not.
We noticed that galaxies tend to all be moving further apart from each other over time. If you play time in reverse, they appear to be getting closer together. And we’re able to play time in reverse because light takes a long time to reach us if it’s coming from really far away. So when we observe stuff that’s really far away it’s like looking far into the past.
But…. There is stuff that is soooo far away that the light will never reach us because the space between us is expanding faster than the light can travel the distance. Anything past this distance has exited the observable universe and we can no longer see it forever.
Thus, the observable universe has a finite distance that can be measured and is not infinite. We can only observe stuff that light can travel the distance between faster than the space expands.
But everything outside the observable universe? We’re not entirely sure how big that is. Could be infinite, might not be infinite. We don’t have a way to prove it yet.
There is the cosmic microwave background radiation which is light that appears everywhere and thus seems to be good evidence for a big bang type event (since if everything originated at a single point that would explain the light being everywhere). But that doesn’t tell us if the universe is infinite or not (what if the single point was infinite).
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