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- The origin, evolution, structure and eventual fate of the universe.
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Quality answers to common cosmology questions
Jul23-14 11:07 PM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
To have an enjoyable cosmo forum we needed a balance between mental freedom on the one hand and a shared knowledge...
Aug2-14 07:51 PM
493 166,550
The new A20 tabular calculator lets you look at changing geometry out to about 88 billion years according to the...
Jun11-14 11:00 AM
65 45,188
I know this question is quite off the track but while watching a documentary I came across terms 'Universe' and...
Jun20-09 10:30 AM
21 8,671
As the title says, my question is how do we know how old the universe is? Thanks
Mar21-14 09:33 AM
4 580
I understand that there are singularity and non-singularity theories of the big bang. Also that there are those that...
Jan7-13 12:31 PM
12 1,661
Suppose we postulate that instead of the universe expanding, the speed of light was decreasing? Now we try to derive...
Jan23-13 09:37 PM
2 738
I was listening to one of Leonard Susskind's cosmology lectures. He talks about the factor K having values of...
May28-14 10:12 PM
6 796
I just finished Leonard Susskind's video course on cosmology. A question never raised nor mentioned in the course was...
Jun5-14 06:00 AM
18 989
I have read in many places that the universe was once smaller than an atom. However, many people here have said this...
Nov8-09 11:15 AM
38 4,882
I just recently discovered that the sun may be the center of the galaxy and what not, but if the universe is infinite,...
Aug22-10 10:52 PM
3 1,118
Hello everybody, I am new to this forum and cosmology in general. My knowledge about cosmology and astro-physics...
Jan13-09 03:51 AM
2 2,093
Just some thought on dark matter/energy, please correct me if I am wrong in any case: Is it possible to explain the...
Sep16-10 12:25 AM
sweet springs
5 1,356
Acc. to general relativity time runs slowly near a massive body.So, i have a question bothering me from some time that...
Nov1-13 01:44 PM
2 959
hi all,o:) anybody please give me a physical explanation for the Gauss-Bonnet invariant... What is its significance...
Jul10-11 07:28 PM
2 4,290
Hi all, Anybody pls help me to convert cosmic time to conformal time (numerically)... is there any analytical...
Aug5-10 08:11 AM
1 2,011
If time travel is possible,is there any problem of universe revolving which would affect time travel,because as,Gödel...
Jan8-10 11:07 PM
9 2,597
Current cosmology is based on CMBR and the idea it is remnant from the big bang, I guess we assume it's the same...
Jan12-10 10:41 AM
4 1,233
While objects closer to us tend to shift both in direction red or blue, depending on their movement in relation to us,...
Jan17-10 11:39 PM
57 10,952
Since the distance between galaxies increases with time does that mean that the matter in those galaxies gets...
Sep20-08 04:51 PM
6 2,750
I am curious about the red shift that is claimed to demonstrate that the Universe is expanding. Is there a...
Mar1-11 01:24 PM
Feeble Wonk
17 2,812
Simple question hopefully. What was the initial value for the hubble parameter immediately following the big bang (or...
Mar2-11 09:06 AM
15 1,952
I'm doing a project on dark matter and i've found some good information but I still haven't found any related...
May2-07 02:27 AM
3 1,038
The bulk of this would be to expand my understanding of what a field actually is so please keep that in mind. I...
Mar11-13 09:31 PM
11 1,523
I constantly hear about seeing the light from a galaxy, now in the 13B-year-old realm. Specifically, galaxy MACS...
Sep26-12 12:30 AM
4 1,356
I found this on wikipedia: Indeed, such a treatment of infinity is ridiculous, but treatments exist in our head...
Feb7-11 10:03 AM
28 4,078
In Einstein's view of a static universe what would happen if some mass turned into radiation? I am thinking that...
Oct3-06 08:50 AM
11 1,998
is it proportional to a^3 or 1 / a^3 . thanks!
Nov14-06 03:45 PM
1 1,340
Subject: Does the Universe have a Boundary ? Since nothing can exist outside of the Universe, how then can the...
Apr9-12 03:03 AM
33 20,538
Dear reader, Of course I searched the site to see other persons discussing the the egg shell theory, but I did not...
Nov10-10 08:38 AM
Vanadium 50
4 1,410
Dark Energy is the term used for the energy / quanta that is required to fill our space. If we considered that our...
Feb29-12 09:57 PM
1 1,124
Who said approximately: The viscosity of the aether / vacuum state / zero-point-field / or whatever is ...
Feb28-12 07:56 PM
26 2,483
"BLACK MATTER" what is it? wheres it come from? how is it related to its opposite force the BLACK ENERGY? why is it...
Mar1-12 05:49 AM
15 2,800
“There are several ways in which a planet can disturb the internal motions of matter in its host star, thereby...
Dec10-09 03:32 PM
3 909
I have a question, but I am not sure how to express it. I have been thinking about the idea of the universe as a...
Aug12-07 04:24 AM
6 2,125
Now suppose for simplicity that the galaxy,and that its physical diameter was w at the time it emitted the light.find...
May24-08 11:57 AM
5 1,569
What's the underlying principle to demonposite metrict fluctuation as scalar ,vector and tensor? Is this...
Feb19-09 07:25 AM
6 2,424
It is emphasized by Mr. bradenberger the concept of super hubble subhorizon fluctuations. I appreciate the idea that...
Mar9-09 03:10 AM
2 1,419
((If this has already been thought or won't work of please tell me so I won't persue the idea any longer)) Is it...
Sep11-06 11:11 PM
2 1,167
How is it not possible that the universe is shaped like a sphere? What evidence do we have that shows it is...
Sep27-06 09:48 PM
13 2,095
I was wondering about this problem with black holes. I will tell you what I know then work on from that. (please tell...
Oct27-06 10:52 AM
1 1,389
Hi, ive been studying formation of solar system and couldn't find an explanation for why the sun didn't absorb...
Feb10-12 02:30 AM
7 2,315
I'm not a physicist nevertheless I wonder about these things so here goes: On wikipedia I read that the universe...
Aug7-14 11:27 PM
16 844

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