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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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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 23,832
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
483 125,906
what's the status of that? also why not just look for two systems that have the same visible distribution but with a...
Dec8-11 12:52 PM
little
2 1,599
how is dark matter different from the old "ether" theory
Apr2-09 02:20 AM
yogi
30 10,109
Unsurprisingly, the conclusions of of Bidin, et al, on the apparent lack of dark matter in our galactic neighborhood...
May22-12 10:05 PM
Chronos
9 1,412
Hi All, First question so please go easy on me. I'm currently reading 'Why Does E=mc2? at the moment and in an...
Apr23-10 04:13 AM
Chalnoth
7 2,616
With nearly all certainty I'm gonna ask something to laugh about but... Assuming LCDM would be right, the fact that...
Jun20-08 01:44 PM
Gerinski
0 1,440
this just out: a survey of efforts to detect DM particles. http://arxiv.org/abs/0705.3345 Direct Dark Matter...
May23-07 07:49 PM
marcus
0 1,146
I have an acquaintance who has a physics doctorate who argued the (to me) novel idea that dark matter doesn't really...
Apr23-11 05:47 PM
Chalnoth
27 2,416
hi, i dont know if this is in the correct place but ive got a question that has puzzled me. i know that the stars...
Dec28-10 10:25 AM
afennah
3 1,165
I have been following stories about dark matter and have, I think, a layman's grasp of it, to whit: In 1933 the Swiss...
Apr5-14 07:43 PM
berkeman
20 875
A recent study using the VLT array has measured the temperature and size of dark matter clumps. Interestingly enough,...
Mar2-06 12:17 AM
Chronos
5 1,839
I'm putting together a slideshow about dark matter for my colleagues and was wondering what would be good reference...
Jan24-07 02:39 AM
Chronos
1 3,380
If dark matter only interacts with baryonic matter gravitationally, would it pool at the center of stars, planets, and...
Mar9-08 04:47 PM
Wallace
11 1,513
Can someone explain why 'dark matter' is the dominate explanation for the 'excess' gravity seen around galaxies? It...
Oct9-11 06:38 AM
Chalnoth
13 2,773
Hi I rarely have a background in physics (yet!) But based on my popular knowledge I understand that the Universe...
May3-13 04:40 PM
marcus
3 672
We know particles have mass. Thusfar we don't know of anything that has mass which is not a particle so we assume the...
Nov10-10 02:51 AM
Chalnoth
68 6,491
http://www.eso.org/public/news/eso1217/ ...
May3-12 11:45 PM
Chronos
25 4,227
Remember this article gang? ...
Apr4-13 07:31 PM
Mordred
13 1,799
Photons must have a certain amount of energy to be absorbed by an electron. A photon with a little too much energy to...
Aug12-10 04:40 AM
Vanadium 50
7 2,692
http://www.physorg.com/news77190620.html
Sep21-06 02:22 PM
Jimmy Snyder
21 2,847
From other threads here Iíve gained a rough understanding of why Dark Matter forms into a halo around galaxies. It...
Apr7-14 04:34 PM
oldGhost1
6 404
Here is the latest in the 'bullet cluster' series on evidence for the existence of dark matter: ...
Feb14-07 04:22 PM
SF
14 2,620
How is the search for dark matter, dark energy and gravitational radiation going, as far as i can make out there has...
Apr17-13 12:07 PM
Nabeshin
4 615
If ordinary matter is related to energy per E=mc^2, then can dark matter also be similarly related, and if so, is...
Apr26-10 06:00 PM
AleLucca
8 1,429
I saw an interesting video that showed the dark matter halo that exists around the milky way galaxy, the scientist...
Sep17-10 10:23 AM
RLutz
2 1,066
The existence of dark matter was inferred in studies of the unaccountable behavior in the rotation of observable...
Sep20-12 12:19 AM
twofish-quant
9 1,421
Anybody have any insight on what this is all about? Looks interesting... ...
Feb18-13 06:28 PM
Vanadium 50
7 1,120
The whole solar system is orbiting the center of the Milky Way at about 250 kilometers per second. But the Earth is...
Apr22-08 02:52 AM
EL
4 1,639
This article appeared March 2nd on Science Daily. Quite interesting. Any comments? ...
Mar20-12 09:46 PM
Bobbywhy
28 3,539
This has been discussed in other topics but not without leaving some issues unanswered. So DM has only gravity and...
Oct31-11 01:03 AM
phinds
26 3,311
What chances would you give the different candidates to actually make up (the major constituent of) the dark matter?...
Mar16-06 01:31 AM
Chronos
76 5,171
Dark matter build up near or inside Black holes, thoughts ? I can see it making a real mess of the motions and...
Nov27-13 07:41 AM
Naty1
11 1,072
Hello fellow Cosmology fans and professionals! Does Dark Matter form into Black Holes, and do regular Black Holes...
Nov22-11 05:37 PM
Chronos
5 2,316
Hello, Firstly, i would like to say that i am by no means an educated person (as in taking specialty courses or an...
Feb24-11 05:56 AM
phyzguy
5 2,344
Are there any theories based upon Dark Matter (DM) being a precursor or sublayer or ground state to Observable Matter...
Oct18-12 02:44 AM
twofish-quant
2 978
I was wondering how to rule out the hypothesis that most of dark matter is due micro - MACHOS, that is, if a...
Jan5-11 06:15 AM
Chalnoth
24 2,291
I was watching a documentary the other day and this idea occurred to me. Here are links to the relevant portions on...
Sep5-11 11:18 PM
David Elm
93 15,340
It seems to me that an obvious source of dark matter (and possibly dark energy) might be the massive ejections of...
Mar30-09 01:42 PM
mintparasol
18 2,132
I have a rather simple question. Dark matter was first proposed because galaxies appeared to have more mass than was...
Oct28-09 02:36 PM
Chalnoth
7 1,761
Could dark matter be the other universes posited by MWI. there has been speculation that the parallel universes remain...
Apr22-10 02:06 AM
Chalnoth
1 1,116
What I was thinking is that if dark matter particles don't interact electromagnetically or by nuclear forces then what...
Apr10-09 08:07 AM
phsopher
9 1,717

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