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Cosmology

- 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
marcus
493 166,481
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
Jorrie
65 45,159
Facts • Speed of light = 300,000 km/sec o http://en.wikipedia.org/wiki/Speed_of_light • Furthest observed...
Oct8-11 01:15 PM
Vorde
1 1,634
Both of them have the same binary system with a white dwarf and a companion star which result in the same bang so what...
Oct8-11 06:04 AM
Drakkith
8 3,007
This comes from Stenger's book the Fallacy of Fine Tuning. This passage doesn't look correct to me. I don't think it...
Oct7-11 04:14 PM
Chalnoth
3 1,318
Hello, glad to be able to post my question ^^ ok i'm no scientist and I haven't looket at the math of quantum...
Oct7-11 03:30 PM
mathman
1 1,709
Expressing the cosmological distances with conventional terms is very confusing. For instance, if we say that "a...
Oct7-11 02:22 PM
Skolon
8 1,421
The Veritas radiotelescope team has detected 100 GeV pulsed gamma rays. This is an awesome finding. In fact I post it...
Oct7-11 08:41 AM
TrickyDicky
1 1,090
What did spacetime look like some time after the big bang? 1) Euclidian space. Imagine yourself in empty space,...
Oct7-11 06:11 AM
LaurieAG
17 4,233
Hi I have two images and I want to compare the "structures" of them at different scales. I remember from cosmology...
Oct7-11 01:32 AM
Chronos
6 2,042
can anyone help? been wondering ...... gravity is the weakest of the 4 fundemental forces and no one knows why....10x...
Oct6-11 01:58 PM
slooper2112
25 3,563
What are the types of radiation that the black hole emits? Does it radiate like a perfect blackbody? Is the...
Oct6-11 12:32 PM
bapowell
26 3,842
In this thread I would like you to add some more detailed information on what the people behind the new physics prize...
Oct5-11 04:10 AM
Chalnoth
2 1,221
Does anyone know what the limit is for light from distant objects to be so redshifted that they become undetectable?...
Oct5-11 12:04 AM
Chronos
9 2,303
What is the ratio of energy contained in photons vs energy contained in neutrions in the present universe? Also, how...
Oct4-11 02:29 PM
nicksauce
4 1,633
Yes, I have heard the theory Ė judging by the distance we know how old the coming picture is. However I donít...
Oct4-11 10:15 AM
SamirS
11 2,098
Because AGN (active galactic nuclei) are so bright, it would be nice if we could tell their intrinsic luminosity or...
Oct2-11 06:00 PM
RUTA
3 1,564
In today's Physics ArXiv: FROM TIME TO TIMESCAPE – EINSTEIN’S UNFINISHED REVOLUTION Dark Energy as simply a...
Oct1-11 05:27 AM
Syntheta
74 8,101
I'd like to understand accelerating expansion better. It seems that space is interjected proportionately where there...
Oct1-11 02:16 AM
Ken G
14 2,626
I came across a startling position on more than one occasion while reading "The Fabric of the Cosmos: Space, Time, and...
Sep30-11 04:58 PM
Jocko Homo
47 7,109
Somewhere, I read about the "Big Rip Theory". Has anyone here heard about the Big Rip Theory? Joe L. Ogan
Sep30-11 08:54 AM
bapowell
10 4,331
http://arxiv.org/PS_cache/arxiv/pdf/1109/1109.6520v1.pdf quote: The velocity anomaly recently reported by the...
Sep30-11 08:02 AM
Vanadium 50
1 1,231
Does it make sense to visualize dark matter as roughly spherical, or oblate, around a spiral galaxy? Perhaps...
Sep30-11 02:08 AM
Chalnoth
2 1,427
dear all, i want to know that is time exist before big bang , if yes then what is actual origin of time and if no...
Sep29-11 08:41 PM
Lost in Space
31 4,936
If the big bang occurs at the first moment of time, then how can there be a multiverse?
Sep29-11 07:21 PM
JordanL
10 2,676
Please be patient with me. Cosmologists compute all the way back to the big bang when there was just a very...
Sep27-11 05:03 PM
Ryan_m_b
40 4,272
I was just watching a television program about gravity today and it got me wondering what gravity was exactly. Most...
Sep27-11 07:55 AM
Vanadium 50
3 1,103
Hi, I read in a book by M. Kaku: "To describe the universe, cosmologists sometimes use the example of looking...
Sep26-11 09:01 PM
Drakkith
7 2,428
Present critical density of Universe rho_crit = 3 H^2 / 8 Pi G H = Hubble Constant = 2.2E-18 sec^-1 rho_crit...
Sep25-11 10:34 AM
Naty1
3 1,886
The cause-effect relationship of timelike events is fairly self-evident. But I was wondering, do non-local effects...
Sep20-11 02:12 AM
Chalnoth
1 1,801
Consider a thought experiment for a moment that hopefully does not violate Physics Forums rules... A sphere is...
Sep19-11 07:41 PM
dst
2 1,615
Hello friends! Forgive me, I have another question for you physicists. We see those active galactic nucley which show...
Sep19-11 03:17 PM
DaveC426913
5 1,612
I have read a few threads on here and acknowledge i am way out of my depth. Bearing in mind my limited knowledge can...
Sep19-11 01:00 AM
LaurieAG
19 2,959
I've always wondered how they know all that stuff, you know, what happened in the first second of the universe. I've...
Sep18-11 06:04 PM
Vanadium 50
8 2,146
I realize BBC science news is not a totally reliable source, but I'm wondering if any of the knowledgeable folks here...
Sep18-11 11:44 AM
phinds
5 2,521
Life on earth has existed for around 3 - 4 billion years and Earth itself has been around for about 4.5 billion years....
Sep17-11 11:49 AM
Ryan_m_b
1 1,814
I am in the process of putting together a presentation on the evolution of the universe for novices and beginners. In...
Sep17-11 09:07 AM
DaveC426913
1 1,035
Hello, friends. I read that polar anisotropy of the CMB shows that the solar sistem is moving towards the Virgin...
Sep17-11 08:35 AM
profgemelli
20 3,293
see http://slatest.slate.com/posts/2011/09/16/kepler_16b_nasa_discovers_planet_with_two_suns_like_tatooine_in_.html
Sep17-11 04:02 AM
twistedspark
3 1,550
I know that typical Black Holes dont feed on Dark matter because they are tiny, so the direct hit is unlikely. While...
Sep17-11 02:44 AM
Chalnoth
8 1,935
Would gravitational waves act just like other types of waves? IE can they interfere, diffract, etc? I would assume no...
Sep16-11 05:36 PM
Nabeshin
20 2,932
Hello guys/gals, I understand this is a probably a stupid/impossible question in yalls eyes, but considering that...
Sep16-11 06:46 AM
bapowell
11 1,907

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