Questions tagged [big-bang-theory]
Questions regarding the currently prevalent cosmological model for the origin of the universe.
30
questions
51
votes
7
answers
12k
views
What is in the center of the universe?
If the universe has formed & originated by a Big Bang Explosion, then there must be empty space left in the center of the explosion site, as all the matter is travelling at tremendous speeds away ...
18
votes
5
answers
12k
views
How can the universe be infinite?
I've heard from renowned astrophysicists that we don't yet know whether or not the Universe is infinite. How is that possible regarding the big bang theory is accepted (as they all do)? Are they ...
22
votes
7
answers
9k
views
Do we know the exact spot where big bang took place?
If you rewind the universe back 14,7 billion years, all matter were in one spot, and then started expanding. Do we know where this is in reference to our own solar system? And is there anything there? ...
19
votes
3
answers
4k
views
How can the 13.8 billion years old universe have a radius of 46 billion light years? [duplicate]
The universe is about 13.8 billion years old. Assume at the big-bang it starts from a small region and the maximum possible speed according Einstein is the speed of light how can the universe got a ...
37
votes
5
answers
16k
views
Why did the big bang not just produce a big black hole?
Questions I've often wondered about:
If all the matter and energy were concentrated at a single point at the big bang, why wasn't that a black hole, or why didn't it form one?
If the reason #1 above ...
5
votes
2
answers
341
views
Is there another explanation, apart from the doppler effect, for the redshift observed in distant galaxies?
On episode 10 of the original Cosmos TV series, Carl Sagan mentions that some scientist don't agree that the redshift observed in distant galaxies is evidence of the big bang, stating that probably ...
4
votes
3
answers
1k
views
How can the universe be expanding faster than speed of light? [duplicate]
So the story goes like this:
A long time ago, 13.799±0.021 billion years to be exact, something happened. It was a big bang, loud explosion and universe came to existence. It grew and grew, and now ...
3
votes
1
answer
902
views
What was "space" like before big bang?
I have a simple question which I think about often but have no answer.
If The Big Bang is true, than if the whole space was just a point 14 billion years ago, then what was around that point, some ...
6
votes
2
answers
630
views
Outside of a Universe and its origin
Per the Big Bang Theory, the universe was formed from a dense singular point which existed 13 billion years ago and has been expanding ever since. This suggests that the point should have existed ...
16
votes
1
answer
3k
views
Can we see the Big Bang happen if we look far enough?
The observable universe is constantly expanding as more light from the Big Bang reaches us. This light has been travelling for billions of years, so we are looking at the universe as it was a few ...
5
votes
2
answers
588
views
How could universe inflate itself out of the very dense and curved early spacetime? Could it happen in a black hole too?
Wasn't spacetime as much curved as a black hole directly after Big Bang, because mass was so densly packed? Wasn't everything like an event horizon and how could things expand across it? Could ...
4
votes
1
answer
211
views
Is it possible to get a glimpse of the Big Bang through gravitation waves?
I read in an article announcing the detection of gravitational waves by LIGO that it will be possible to detect them from the Big Bang. Is this true?
4
votes
1
answer
2k
views
Why can't we determine the center of the universe [duplicate]
I find this baffling. If we can observe objects moving away from us and each other, than it stands to reason that we can track their paths (relative to each other and ourselves) backward to find a ...
3
votes
1
answer
445
views
Does a White hole lies behind a Black hole?
While reading about a White holes, I stumbled upon a question "Where does the matter emitted by a White hole come from?" There seems to be 2 possible candidates:
It was the matter engulfed by a ...
2
votes
1
answer
270
views
if the big bang only expanded the universe when and how did it originate? [duplicate]
If the big bang expanded the universe from a singularity point, that means that there was matter before, so where and how did matter form for the first time if it's even possible to know such a thing?