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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
483 125,396
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 23,502
I'm just finishing up Steven Weinberg's "The First Three Minutes" and I noted with some bemusement that in the middle...
Jun28-11 06:50 AM
phinds
13 1,929
Since everything in the Universe seems to be rotating, be it atoms or planets or stars or galaxies, and since the...
Jun28-11 12:38 AM
bcrowell
92 13,652
First, I must stress that I am not asking this question in relation to the proof, or disproof, of any form of rotating...
Jun27-11 03:21 PM
Tanelorn
13 2,443
I have a question sort of related the size of the observable universe. I know that we are limited by the speed of...
Jun27-11 12:40 PM
Cosmo Novice
4 1,531
I've read a fair few articles recently about the big bang being utter fiction and that there is ALOT more evidence to...
Jun26-11 09:57 AM
russ_watters
9 3,836
Will the big bang be seen as 13.7 billion years ago by all observers in the universe regardless of their velocities ?...
Jun26-11 12:07 AM
Singham
15 2,768
I have a question and/or a thought on dark energy. I have just 2 years of college Physics so I apologize if my...
Jun25-11 01:12 PM
tkav1980
6 1,323
imagine a photon (travelling with the speed of light) is moving straight towards a huge mass say 10^10 Msun. what will...
Jun25-11 05:33 AM
Drakkith
2 984
Hi, as you all know, current cosmological N-body simulations (like the Millenium run) are based on the Newtonian...
Jun25-11 01:21 AM
Nabeshin
4 1,355
As the thread title says, if the universe is finite will i see my light again. I understand that parts of space-time...
Jun24-11 09:57 PM
tkav1980
2 1,121
Hello, Just having a few thoughts and wondered if anyone can answer: Would an antimatter Universe be expected to...
Jun24-11 01:41 PM
bcrowell
3 1,346
what is the temperature of cold & hot dark matter?
Jun24-11 01:40 PM
zhermes
1 1,186
I have a question about the horizon size of the empty Milne Universe. The empty Milne Universe expands linearly...
Jun24-11 10:19 AM
bapowell
23 2,688
Here are some recent papers on attempts to detect dark matter directly or indirectly: a solar system test with a...
Jun23-11 09:39 PM
Drakkith
1 1,628
Are there any explanations for the abundance of matter during the M/AM annhialation phase? If the Universe is...
Jun23-11 09:27 PM
bcrowell
1 825
I dont know if this is the right topic to post this, so if it isn't please point me in the right direction. Ok so I...
Jun23-11 06:25 PM
cepheid
7 1,358
Observations show that the current density of the Universe is close to the critical density: rho = 3 H_0^2 / 8 Pi G...
Jun23-11 03:20 PM
bapowell
4 1,310
I came by this in Arxiv, i don't understand it all so i thought i would just flag it. arXiv:1106.3666...
Jun22-11 10:56 AM
petm1
1 740
The lambda-CDM model predicts a nearly flat spatial curvature at scales larger than the the scale of homogeneity of...
Jun22-11 12:48 AM
Chalnoth
4 1,183
Hi. My name is Lyle and I have some ideas floating around i want to share with you all. It started when I was...
Jun21-11 03:20 PM
bcrowell
6 1,164
I posted this question on Yahoo Answers yesterday, but it might be too specialized: If I understand correctly, the...
Jun21-11 11:31 AM
JDoolin
8 1,636
http://www.wired.com/wiredscience/2011/06/clumpy-universe/ The universe appears to be clumpier than astronomers...
Jun21-11 09:31 AM
bcrowell
4 1,255
Hi all, I'm new here so please forgive me if this has been explained somewhere already. Lately I've been reading...
Jun20-11 11:18 AM
bcrowell
25 2,712
I'm a college student in New York and I've been doing some thinking lately. Although mathematics is unfortunately one...
Jun20-11 07:14 AM
WannabeNewton
3 1,847
If there were no Space-Time before the Big Bang, then where did that explosion took placed?
Jun20-11 12:26 AM
narrator
15 2,313
As I understand it, somewhere close to the beginning of the universe, the universe experienced an inflationary phase...
Jun18-11 09:56 PM
narrator
7 1,089
I've been reading about the early universe (The book: The First Three Minutes) and it prompted a few questions: Is...
Jun18-11 09:18 PM
narrator
4 991
How many will argue that heat death is a better end to our universe rather than a bounce into a new universe
Jun18-11 09:15 PM
narrator
9 1,166
I was watching 'Into the Universe, with Stephen Hawking', and it said that once the big bang began, in a few minutes...
Jun18-11 01:58 PM
bcrowell
2 667
Iím new to these forums and as a matter of personal curiosity, and as someone who canít follow the math behind the...
Jun18-11 12:26 AM
zhermes
6 1,932
I heard that eventually the universe will end in heat death where everything becomes cold and lifeless and immotile....
Jun17-11 09:03 PM
Bob3141592
35 3,952
I was wondering what a plot of energy against space-time would look like going from alpha to omega, using the...
Jun17-11 06:04 PM
axiomatical
4 1,809
has anyone thought that our universe orbits with other universe's around a central core. our universe might not be...
Jun17-11 11:53 AM
bcrowell
3 1,164
Hello, Maybe a strange question here (I'm not 100% current with the standard model), but does the standard model...
Jun16-11 08:30 PM
Aztral
2 905
Hi all, I was wondering: to the best of our current observational knowledge, is the rate of expansion of the...
Jun15-11 04:18 AM
Chalnoth
6 1,691
Could i predict what everything in the universe will look like in 10 million years using formulas, or is that...
Jun14-11 10:19 AM
bcrowell
10 2,779
Atoms were created 300,000 years after the big bang when the universe had finally cooled down enough. Did gravity...
Jun14-11 05:34 AM
alphali
8 1,960
I may be simplifying but if the universe is spacetime and time is local how can you define a time elapsed from the big...
Jun13-11 06:12 PM
bcrowell
1 1,003
Here's an idea I came up with recently, that I wanted to share: Physics is unitary and CPT symmetric, and therefore...
Jun13-11 06:06 PM
bcrowell
9 1,240
Black holes suck in everything around them. My 5 year old knows that one. It's all over TV, etc. But what about the...
Jun13-11 01:28 AM
Chalnoth
4 929

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