<p>The Big Bang started as a singularity. That means small. All the matter in the universe was in a volume smaller than its own Schwarzchild radius. The universe was inside a black hole.</p>
<p>At present, the universe is big: bigger than its Schwarzchild radius. It got out of its own black hole which, they tell me, can’t be done.</p>
<p>How did this happen?</p>

CC BY-SA 4.0
2021-11-30T18:50:10.133Z
What have you found out in the intervening 46 years?
Jim421616
CC BY-SA 4.0
2021-11-30T19:06:20.630Z
That I'm a bear of very little brain.
Woody
CC BY-SA 4.0
2021-11-30T19:11:46.460Z
[Is the Big Bang a black hole?](https://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/universe.html) Also see https://physics.stackexchange.com/q/3294/123208 & https://physics.stackexchange.com/q/136860/123208
PM 2Ring
CC BY-SA 4.0
2021-12-07T18:25:28.350Z
Why do you think there was a black hole? And if there was, what makes you think we are now outside it? Both these assumptions should be seriously challenged. Also, space itself got bigger, which is very different to something getting bigger and escaping a black hole.
Rory Alsop
CC BY-SA 4.0
2021-12-07T22:03:43.183Z
The Schwarzchild radius for the mass of the universe is roughly galactic in size. Initially, the radius of the universe was smaller than that.
Woody
CC BY-SA 4.0
2021-12-08T23:02:09.393Z
"All the matter in the universe was in a volume smaller than its own Schwarzchild [sic] radius." You're confusing the whole Universe with the **observable universe**: there's simply no way to guess the volume or mass of what's beyond observation, so you can't calculate a density or Schwarzschild radius. For the *observable* universe you're ignoring metric expansion: when the universe was "smaller", so was the "ruler" measuring its Schwarzschild radius.
Chappo Hasn't Forgotten
<black-hole><cosmology><big-bang-theory>
How did the Universe climb out of its own Big Bang black hole?
Woody
# How did the Universe climb out of its own Big Bang black hole?

(Asked by: username_0 on 2021-11-30)

The Big Bang started as a singularity. That means small. All the matter in the universe was in a volume smaller than its own Schwarzchild radius. The universe was inside a black hole.

At present, the universe is big: bigger than its Schwarzchild radius. It got out of its own black hole which, they tell me, can’t be done.

How did this happen?

**Tags:** black-hole, cosmology, big-bang-theory
> **Comments:**
> **username_1**: What have you found out in the intervening 46 years?  
> **username_0**: That I'm a bear of very little brain.  
> **username_2**: [Is the Big Bang a black hole?](https://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/universe.html) Also see https://physics.stackexchange.com/q/3294/123208 & https://physics.stackexchange.com/q/136860/123208  
> **username_3**: Why do you think there was a black hole? And if there was, what makes you think we are now outside it? Both these assumptions should be seriously challenged. Also, space itself got bigger, which is very different to something getting bigger and escaping a black hole.  
> **username_0**: The Schwarzchild radius for the mass of the universe is roughly galactic in size. Initially, the radius of the universe was smaller than that.  
> **username_4**: "All the matter in the universe was in a volume smaller than its own Schwarzchild [sic] radius." You're confusing the whole Universe with the **observable universe**: there's simply no way to guess the volume or mass of what's beyond observation, so you can't calculate a density or Schwarzschild radius. For the *observable* universe you're ignoring metric expansion: when the universe was "smaller", so was the "ruler" measuring its Schwarzschild radius.  

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## 0 answers

