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Quality answers to common cosmology questions
Jun25-11 08:50 PM bcrowell 

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Cosmology

- The origin, evolution, structure and eventual fate of the universe.
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To have an enjoyable cosmo forum we needed a balance between mental freedom on the one hand and a shared knowledge...
Apr8-14 08:39 AM
Jorrie
483 125,894
The new A20 tabular calculator lets you look at changing geometry out to about 88 billion years according to the...
Feb8-14 08:31 AM
mfb
61 23,825
Is there a relationship between the mass of a bh and its host galaxy or the age of its host galaxy. (the more distance...
Sep3-09 01:54 PM
nicksauce
1 1,014
NOT the total distance that we have traveled, straight, curved, or whatever, through space but how far are we now,...
Sep2-09 10:15 PM
marcus
8 1,640
I've heard it said that it is impossible to determine an objects absolute velocity, all one can do is find it relative...
Sep1-09 05:54 AM
russ_watters
15 3,712
I once learned (way back when) that nothing can move faster than light in a vacuum. But this now seems simplistic. For...
Aug30-09 03:48 AM
Chronos
43 3,910
Astronomers believe that the universe is expanding because of the measured doppler effect redshift of light emitted...
Aug30-09 12:18 AM
QTANTOBA
9 3,452
Can someone please give me a succinct definition/description of what this is? I can't seem to find any references to...
Aug29-09 08:08 PM
Moloch11
20 2,335
There was an article in the Proceedings of the National Academy of Sciences where the authors derived a model which...
Aug29-09 08:17 AM
chronon
12 1,965
Can someone please sum up "Cosmic Darwinism" for me? I've looked on search engines and I can't seem to find anything.
Aug27-09 11:33 AM
ViewsofMars
8 1,867
as we know that nothing can escape from the black hole. but theory given by hawking for his radiation is fool proof or...
Aug27-09 10:28 AM
jnorman
11 1,594
Could dark matter be neutrinos? I'm wondering, neutrinos are weakly interacting, but they do respond to gravity. So...
Aug27-09 09:53 AM
Chalnoth
5 1,159
If we were to take the multiverse paradigm, and there are multitude of universes which do not intersect and thus don't...
Aug27-09 01:01 AM
Chronos
4 2,627
I am fascinated with this idea.
Aug27-09 12:42 AM
Chronos
1 1,351
http://arxiv.org/PS_cache/arxiv/pdf/0908/0908.3186v1.pdf We use a variant of principal component analysis to...
Aug26-09 01:40 AM
Chalnoth
4 1,003
hi. im an undergraduate physicist and don't have that much exposure to cosmology but i was watching a BBC Horizon...
Aug24-09 03:11 AM
Chronos
15 2,428
My knowledge in physics is very limited. Could someone please explain what this means in regular English? :uhh: ...
Aug24-09 02:36 AM
Chronos
2 1,338
as we know that gravitational force increases as mass increases.Then why galaxies are recessing from each other as per...
Aug22-09 12:31 AM
Chalnoth
2 1,527
Erm, so, I get that subatomic particles behave differently in different universes because they're random, but do...
Aug22-09 12:25 AM
Chalnoth
1 1,018
I've heard many people claim that the first law of thermodynamics proves that the energy/matter must always exist in...
Aug21-09 07:34 PM
apeiron
25 3,343
In another thread (Cosmic Darwinism) I mentioned a scholarly book (600 pages) with a chapter on the cosmological...
Aug21-09 05:34 PM
marcus
0 1,151
How can I understand the bubble nucleation in the process of phase transition? Are there any analogs or clear...
Aug21-09 12:40 AM
Chalnoth
1 1,797
Paul Steinhardt and Neil Turok, Princeton and Cambridge, respectively, explain their new cyclic model of the universe...
Aug20-09 10:57 PM
Ithryndil
18 4,185
I wanted to know, since the matter in space is moving, is space itself in a state of motion? If it is would we be able...
Aug20-09 01:38 PM
Hyrage
6 4,818
Hello all, I am wondering how would you calculate the weight of a black hole?
Aug20-09 02:01 AM
LithiumHelios
4 1,472
Good day. I've been reading and reviewing the posts and linked references on this forum for about 3 weeks now...
Aug20-09 12:54 AM
sylas
10 1,382
Is it correct to say that N-body simmulations of structure formation in LCDM model use as initial conditions the...
Aug19-09 08:55 AM
smallphi
0 682
Does anybody know a reference discussing how the peculiar velocities of large structures like voids for examples...
Aug19-09 08:23 AM
smallphi
0 814
I was just reading an article about dark matter and the expansion of the universe and thorught it sounded like a bit...
Aug19-09 03:37 AM
Chronos
5 1,719
I need to know the magnitude of the velocity perturbations (peculiar velocities) dv at time of last scattering as...
Aug19-09 12:06 AM
Chalnoth
1 976
I was watching "The Universe" on History Channel today and it was asking the quesiton, "what was before the Big Bang...
Aug18-09 10:58 PM
ViewsofMars
2 1,034
I've always wondered, have scientists been able to find the center of the Universe? I don't mean of just the...
Aug17-09 03:57 PM
DrChinese
11 1,479
We should discuss Cosmic Darwinism. It is achieving prominence, so we should know something about it. To make the...
Aug17-09 09:05 AM
marcus
37 2,566
This is my 1st post ever, apologies and thanks in advance to all who read or respond. How does the actual size of all...
Aug17-09 02:27 AM
Chalnoth
26 2,453
Being no more than a pop-sci reader in this subject, I'd like to ask the experts a naive question: At that instant...
Aug16-09 10:59 PM
Rymer
36 3,332
Does anyone know where I can find numbers (or how to derive) the CMB flux density (W/m^2)? I'm only really interested...
Aug14-09 02:16 PM
Chalnoth
5 2,508
Hi! I'm new here and I have a question I hope you can help me with. I'm curious about the conclusion that our...
Aug14-09 03:36 AM
h1ghf1ve
5 1,743
This may be a totally silly question, it's nagging at me and I figure you guys can give me peace. We observe that...
Aug13-09 10:47 PM
beeresearch
9 3,893
does the expansion itself redshifts photons (if so, does the expansion affect the photon in his frame of referance?)...
Aug13-09 02:46 AM
Chalnoth
1 1,703
In "A Brief History of Time" Hawking questions why the expansion of the universe is accelerating. I must be missing...
Aug12-09 04:47 PM
marcus
141 8,889
imagine the overall universe as being really big such that minor variations in the overall density of our visible...
Aug11-09 01:37 AM
Chalnoth
2 739
http://en.wikipedia.org/wiki/Higgs_mechanism Since the proposed Higgs field is a quantum fluid filling all of...
Aug10-09 10:59 AM
Chalnoth
5 1,580

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