Linked Questions

12
votes
1answer
2k views

Is the question: 'Is our universe the inside of a black hole?' meaningful? [duplicate]

By meaningful I mean experimentally falsifiable.
0
votes
1answer
157 views

Do calculations support the idea that our universe should be a black hole? [duplicate]

In "The Physics of Star Trek" by Lawrence M. Krauss, he mentions that our universe, by all calculations, should actually be a black hole. I read it a while ago, but I think he mentioned that the mass ...
4
votes
0answers
111 views

How do we know we are not inside a black hole? [duplicate]

I watched a documentary on monkey flying into black hole and what it would perceive. Entire history of the universe redshifted in all directions, but without any way of knowing it's passed event ...
-1
votes
2answers
140 views

Universe as a black hole - how did everything escape? [duplicate]

While listening to physics lectures, they glossed over things escaping from black holes insinuating it doesn't happen other than radiation... When talking about the period between Planck Epoch & ...
1
vote
1answer
110 views

The largest black hole [duplicate]

The Schwarzschild radius involves an expression in terms of Newton's constant $G$, the mass $M$ inside a radius $r$, and the speed of light squared $c^2$. Current estimates of the universe's matter ...
1
vote
0answers
109 views

If the Schwarzschild radius of the universe is bigger than the universe, how come the universe didn't collapse into a black hole? [duplicate]

According to this answer, the Schwarzschild radius of the universe is about 3 times the radius of the universe. According to the Newtonian theory of gravity, inside any sphere of a given density, the ...
0
votes
0answers
98 views

Can our universe be a black hole? [duplicate]

I watched with interest the NOVA Black Hole Apocalypse which was fun. They had a secondary list of vids of one was entitled Four Types of Black Holes. Now I thought that black holes don't ...
17
votes
3answers
4k views

If the observable universe were compressed into a super massive black hole, how big would it be?

I understand only a little of general relativity, but that's why I'm here! :) Consider the hypothetical situation of some extra-terrestrial intelligence pushing all the mass in the observable ...
16
votes
4answers
2k views

Is the observable region of the universe within the event horizon of a super-massive black hole?

Observations: I have read that for a free-falling observer within the event horizon of a black hole that all lines of sight will end at the singularity which is black. I also look up and see that the ...
5
votes
1answer
3k views

How can the Schwarzschild radius of the universe be 13.7 billion light years?

So i was reading about Schwarzschild radius on Wiki and I found a interesting thing written there link. It says that the S. radius of the universe is as big as the size of the universe? How is ...
12
votes
1answer
564 views

Can you have black holes in your black holes?

Inspired by Are we inside a black hole?, can you have a black hole such that other black holes are in them? In particular, the event horizon of the larger black hole should completely enclose the ...
3
votes
2answers
732 views

White holes as dark energy? [closed]

I apologise right away for the possibly incompetent question, but I am not a physicist, and this just came to my mind without really thinking much about it. On one hand we struggle to find white ...
-3
votes
2answers
410 views

Is Speed of light the Escape velocity of the Universe?

If speed of light is the escape velocity of a Black Hole, Why cannot it be assumed that it is the escape velocity of this Universe OR that we live inside a Black Hole?
1
vote
1answer
235 views

Is it possible to say we are inside a black hole? [closed]

Why I am asking is because I read about it on the internet. But if that is true, does it imply the following? If one is inside a black hole than he could be seen as trapped in a space-time ...
-1
votes
1answer
122 views

What are black holes made of, and if one “eats” enough, will it cease being a black hole?

I kind of already know the answer to the second part (which must be 'yes'), but I'd still like to know what black holes essentially are. Are they made out of a special material to have density as high ...

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