All Questions
41
questions
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191
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Are black holes the edge of our universe?
Are black holes the actual edge of the universe? Because spacetime is another dimension, I would assume the universe doesn’t have perceived corners or edges. At least humans cannot perceive it.
The ...
- 11
8
votes
3
answers
483
views
What portion of the universe is black holes?
What portion of the universe is black holes? Is it possible to estimate the percent of all mass that is in the black holes?
- 605
1
vote
0
answers
91
views
If all the black holes in the Universe were combined into one supermassive black hole, what would its diameter be?
I am curious to know if anyone has ever sat down and calculated what the diameter of a black hole would be, in kilometers, if it were to contain all the mass of all the black holes that are currently ...
- 478
1
vote
0
answers
24
views
Why didnt early universe collapse into black hole? [duplicate]
Given the early universe was infinitely small, why didnt it immediately collapse into a blackhole before it had time to expand?
- 11
0
votes
1
answer
117
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How was the Big Bang possible if it was so dense even light cannot escape? [duplicate]
Since the big bang comprises of all the particles in the universe in an extremely dense point, couldn't it to be said it would be the most massive black hole to ever exist? Since even light cannot ...
- 11
1
vote
1
answer
55
views
How hot is a primordial black hole and does it has angular momentum?
I am fascinated by these elusive phenomenon, they are formed in the early stage of the universe where it is not homogeneous and some regions are very dense enough to undergoes gravitational collapse. ...
- 13k
-2
votes
1
answer
125
views
Is it possible that a black hole has a universe in itself? [duplicate]
Every black hole has a singularity. But the singularity is covered by a thing called 'Event horizon'or ' Schwarzchild Radius'. Our universe is originated from a naked singularity. By naked singularity,...
1
vote
1
answer
145
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Child Universes
I was watching a program on the future of the Universe and it got into the eventual heat death resulting from Hawking Radiation as the last hurdle till nothingness (assuming the unproven theory of ...
- 43
16
votes
2
answers
551
views
Mathematical coincidence of the Schwarzschild radius of the Universe?
I read here that a black hole with a mass of the observable universe, $M=8.8\times10^{52}kg$, would have a Schwarzschild radius of $r_s=13.7$ billion lightyears.
I immediately noticed that at the ...
- 690
0
votes
0
answers
50
views
Big crunch scenario, would black holes form?
Imagine a big crunch scenario in which everything (or almost everything as for I have other doubts, eg about entropy...) rolls back.
Shouldn't the contracting universe reach a point of density at ...
- 1,729
1
vote
1
answer
147
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 ...
- 11
0
votes
2
answers
858
views
Will everything eventually be a single black hole? [duplicate]
Given the idea that gravity is always a factor (even though greater distances are excessively tiny), would everything eventually end up forming a single black hole?
My thinking is that, with infinite ...
- 1,083
1
vote
1
answer
489
views
What conceivable connection is there between the cosmological constant and radius of the Universe?
You probably noticed that the radius of the (observable) Universe in Planck lengths $R$ (about $10^{60}$) and the cosmological constant $\Lambda$ (about $10^{-120}$) in natural units obey ...
user84158
0
votes
0
answers
132
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 ...
- 1,701
2
votes
1
answer
169
views
Universe expansion / contraction ambiguity
I've read everywhere that the universe is expanding, and accelerating the expansion. But it is our single point observations of the universe enough to resolve this result?
What gives us 100% ...
- 133