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
You do not know the universe has expanded uniformly during its lifespan. Even a second of error can compound quickly when you are dealing with billions of years. You need to be able to observe something when measuring it. If not, it is just guesswork. You can lower the margin of error of your guess. But it is still a guess.
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