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

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- 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
61 23,580
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
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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
27 2,413
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
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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
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A recent study using the VLT array has measured the temperature and size of dark matter clumps. Interestingly enough,...
Mar2-06 12:17 AM
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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
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If dark matter only interacts with baryonic matter gravitationally, would it pool at the center of stars, planets, and...
Mar9-08 04:47 PM
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
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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
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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
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May3-12 11:45 PM
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Remember this article gang? ...
Apr4-13 07:31 PM
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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
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Sep21-06 02:22 PM
Jimmy Snyder
21 2,844
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
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Here is the latest in the 'bullet cluster' series on evidence for the existence of dark matter: ...
Feb14-07 04:22 PM
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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
4 611
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
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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
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The existence of dark matter was inferred in studies of the unaccountable behavior in the rotation of observable...
Sep20-12 12:19 AM
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Anybody have any insight on what this is all about? Looks interesting... ...
Feb18-13 06:28 PM
Vanadium 50
7 1,111
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
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This article appeared March 2nd on Science Daily. Quite interesting. Any comments? ...
Mar20-12 09:46 PM
28 3,527
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
26 3,297
What chances would you give the different candidates to actually make up (the major constituent of) the dark matter?...
Mar16-06 01:31 AM
76 5,165
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
11 1,066
Hello fellow Cosmology fans and professionals! Does Dark Matter form into Black Holes, and do regular Black Holes...
Nov22-11 05:37 PM
5 2,305
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
5 2,342
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
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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
24 2,289
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
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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
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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
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Could dark matter be the other universes posited by MWI. there has been speculation that the parallel universes remain...
Apr22-10 02:06 AM
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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
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Dark matter is believed to have a more homogenous distribution than normal matter, a bias of at least 2 is used in...
Oct18-10 06:36 AM
19 2,163
New Scientist has a page on a new theory, proposed by Andrew Liddle, says that maybe one particle is responsible for...
Sep16-07 06:57 AM
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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
25 3,132
Before i begin, i will note that i truly don't have any idea of what i'm about to ask, but the questions elude me so...
Aug28-12 05:10 PM
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I am not currently a physics major, just an enthusiast. Hopefully that will change soon. Regardless: I hear physicists...
Dec23-12 08:42 AM
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According to the theory of relativity, the universe should expand from the center (place of Big Bang) with a maximum...
Jun22-13 08:29 AM
3 587

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