This came from the website with the a article 251x calc. i'll try to find more links about it.
"This means the unobservable Universe, assuming there's no topological weirdness, must be at least 23 trillion light years in diameter, and contain a volume of space that's over 15 million times as large as the volume we can observe.
If we're willing to speculate, however, we can argue quite compellingly that the unobservable Universe should be significantly even bigger than that.
Before the Big Bang, the Universe underwent a period of cosmic inflation. Instead of being filled with matter and radiation, and instead of being hot, the Universe was:
- filled with energy inherent to space itself,
- expanding at a constant, exponential rate,
- and creating new space so quickly that the smallest physical length scale, the Planck length, would be stretched to the size of the presently observable Universe every 10―32 seconds."
"Inflation causes space to expand exponentially, which can very quickly result in any pre-existing curved or non-smooth space appearing flat.
If the Universe is curved, it has a radius of curvature that is at minimum hundreds of times larger than what we can observe. (E. SIEGEL (L); NED WRIGHT'S COSMOLOGY TUTORIAL (R))"
"
We know the size of the Observable Universe since we know the age of the Universe (at least since the phase change) and we know that light radiates. […] My question is, I guess, why doesn't the math involved in making the CMB and other predictions, in effect, tell us the size of the Universe? We know how hot it was and how cool it is now.
Does scale not affect these calculations?
Oh, if only it were so easy." "They tell us that if the Universe does curve back in on itself and close, the part we can see is so
indistinguishable from "uncurved" that it much be at least 250 times the radius of the observable part."
That should contradict the 251x O.U. That too is a guesstimation, but they are also second guesing themselves within the article. It is also taking on the assumption that it is curved, but after recent experiements. We know the Universe is flat. They also mention inflation in the article several times for a total of 14. (refer to my long comments above.) The person who tried to calc the volume/size also admits that the scale of the universe (The curvature) will affect his results.Another error the article makes is that inflation happaned before the big bang, but it didn't. [
source is here. ]
In summary: this article in particular has some contradictions, and almost seems it is unnreliable
Edit: my point here is both are estimations, and this article in particular has some problems with it.