If we know approximately how long it’s been since the Big Bang, and we know approximately how fast the universe expands/has been expanding, why can’t we get a good estimate on how big the non-observable universe is? Or more specifically, why can’t we figure out the radius on how far matter has spread out since the Big Bang?
In: Planetary Science
The non-observable universe is, by definition, unobservable. We don’t know if it exists. Furthermore, we don’t know how much spacetime there was at the Big Bang. You’re imagining a single dot of matter exploding into the universe, but that’s not accurate. The universe might very well be infinite in both scale and matter, and it was just closer together in the beginning.
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