All Questions
Tagged with big-bang space-expansion
64
questions
68
votes
5
answers
16k
views
Can space expand with unlimited speed?
According to this article on the European Space Agency web site just after the Big Bang and before inflation the currently observable universe was the size of a coin. One millionth of a second later ...
- 783
30
votes
5
answers
6k
views
If the universe is expanding, what is it expanding into? [closed]
If the universe is expanding, what is it expanding into?
When the big bang happened where did it occur?
When the big bang happened how did it occur?
Where did the energy come from? Energy can not be ...
- 441
26
votes
7
answers
4k
views
Why did the universe not collapse to a black hole shortly after the big bang?
Wasn't the density of the universe at the moment after the Big Bang so great as to create a black hole? If the answer is that the universe/space-time can expand anyway what does it imply about what ...
- 517
16
votes
2
answers
5k
views
How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago? [duplicate]
I was reading through the Wikipedia article on Quasars and came across the fact that the most distant Quasar is 29 Billion Light years. This is what the article exactly says
The highest redshift ...
- 161
14
votes
3
answers
5k
views
What has been proved about the big bang, and what has not?
Ok so the universe is in constant expansion, that has been proven, right? And that means that it was smaller in the past.. But what's the smallest size we can be sure the universe has ever had?
I ...
- 1,387
14
votes
3
answers
5k
views
What does it mean that the universe is "infinite"?
This question is about cosmology and general relativity.
I understand the difference between the universe and the observable universe. What I am not really clear about is what is meant when I read ...
- 13.5k
24
votes
7
answers
4k
views
Given that matter cannot escape a black hole, how did the big bang produce the universe we see today?
Extrapolation of the expansion of the Universe backwards in time using general relativity yields an infinite density and temperature at a finite time in the past.
If the matter contained within our ...
Daniel X Moore
3
votes
1
answer
1k
views
spacetime expansion and universe expansion?
First of all, does the expansion of spacetime solely cause the expansion of universe?
Secondly, if spacetime is the sole cause, do objects(matter with mass) themselves expand?
Thirdly, by spacetime ...
- 685
13
votes
7
answers
4k
views
Is it possible that galaxies' redshift is caused by something else than the expansion of space?
I was thinking that maybe photons loss energy naturally when they travel great distances.
Or maybe the mass of all matter is increasing over time and therefore photons emitted in the past are ...
- 1,613
6
votes
2
answers
1k
views
Superluminal expansion of the early universe how is this possible?
Is this a postulate? I get the expansion of the universe, the addition of discrete bits of space time between me and a distant galaxy, until very distant parts of the universe are moving relative to ...
- 379
4
votes
1
answer
3k
views
Equation for Hubble Value as a function of time
I am trying to write the equation for the situation where the Hubble parameter $H$ would be changing over time. In other words, it would represent an accelerated expansion of the Universe. That is, $...
- 321
6
votes
4
answers
1k
views
Before the Big Bang
I've heard this saying before I don't know about anyone else. It says, "What ever was before the Big Bang is something physics can't explain..!
Is this saying true (accurate)?
- 211
16
votes
2
answers
3k
views
What evidence do we have that CMB is the result of the Big bang?
I got the main picture repeated over and over again about why if there's a Big bang we indeed should see the CMB with this feature. In this question I'm asking something different: what independent ...
- 944
14
votes
6
answers
23k
views
Does entropy increase or decrease as our Universe is expanding?
Scientists say that entropy of our universe is increasing as it is expanding and our universe is cooling down gradually from the time of its birth. If something is getting cooler and cooler, then how ...
- 335
9
votes
2
answers
744
views
Is there a consensus on the fate of our universe?
We all know that our universe is inflating from what is known as the Big Bang. However, will our universe continue to inflate at the current rate? Or after reaching a maximum size, will it collapse in ...
- 647