All Questions
Tagged with observable-universe astrophysics
13
questions
2
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0
answers
84
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Would we know if the universe was rotating?
I was wondering what we would observe if the universe had a small rotation. My conclusion was that galaxies on the equatorial plane of the universe would be slightly more redshifted than galaxies than ...
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3
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Is there anything currently 46 billion light years away from Earth that we can see?
If the oldest galaxy ever discovered, i.e GLASS-z13, is at a present proper distance of around 33 billion ly from Earth, why then do we define the observable universe to have a radius of around 46 ...
- 657
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3
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Is the dark matter just regular matter out of the observable universe?
Could it be that darkmatter is actually the gravitational influence of regular matter that is situated out of the observable universe?
- 11
4
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1
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106
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Eccentricity of Exoplanets
The field of astrobiology specifically discovering other planets that revolve around the sun-like star (also known as Exoplanets) has risen since 1990, but certain orbits of exoplanets are observed to ...
- 311
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Is the age of the Universe really 13.8 billion years?
Ok, I know this has been asked by a lot of people, but my reason for asking this question is a bit different. Please read further.
I was watching a video by Fermilab (Start at 6:30, at 8:30 he ...
- 189
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2
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202
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How far away are objects whose light will never reach us, because of the expansion of the universe?
I thought I had read this question on Stack Exchange before, but now I cannot find it... In fact, I thought I had posted this question before, somewhere, on Stack Exchange...
I believe the answer ...
- 5,307
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1
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Are the most distant known objects in the universe more than 14 billion light years away? [duplicate]
When I hear about the most distant objects in the universe, such as the recently discovered galaxy GN-z11, their distances are usually stated to be a little under 14 billion light years away....
But, ...
- 5,307
40
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3
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How do scientists know that the distant parts of the universe obey the physical laws exactly as we observe around us?
How do scientists know that distant parts of the universe obey the physical laws exactly as we observe around us?
The question might look a bit odd but I am really stuck on my head. We know, ...
- 1,007
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Demonstration of scales for the two components (transverse and perpendicular) of Baryonic Acoustic Oscillations (BAO)
I transfer here a post that has not had any answer pn physics exchange, so I am going to delete this latter. Maybe I will have more luckiness here.
In an astrophysics context about BAO (Baryonic ...
user16492
3
votes
3
answers
488
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Does the universe curve in on itself?
I've read a little bit about the universe, but its not clear to me if there is a place in the universe beyond which there are no stars.
For example, is there anywhere in the universe that one could ...
- 721
4
votes
1
answer
474
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Necessary steps to calculate photon's path by using null geodesic equation
Can anyone please give me an explanation on how to calculate photon's path by using the null geodesic equation? N.B. I know all of the non-zero values of Christoffel symbols.
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8
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1
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Is our universe stable or metastable?
I've been reading and thinking about this subject for some time, but I can't seem to find a clear answer.
After reading Q14:
Aspects of the Higgs boson suggest that our Universe is only
“...
- 437
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1
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false to stable vacuum transition [closed]
if the universe transitioned from a meta-stable vacuum to a stable vacuum we assume a universal death scenario. However since it cannot propagate faster than the speed of light, from any particular ...
