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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
493 167,735
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 45,909
Hello. I am in the middle of a paper on Hubble's law and the Friedman equations, I would like to show that with...
Dec14-11 05:56 AM
Bojje
2 2,001
Ok this may seem almost silly and childish but... Why isn't everything just clumped together? Why is there space...
Dec13-11 06:00 PM
Drakkith
24 7,985
It's generally accepted that nothing can travel faster than the speed of light (expect hypothetical particles that...
Dec13-11 03:17 PM
mathman
2 1,472
Ok so first I know that this equation was presented by Stephen Hawking to describe to Temperature of a black hole: ...
Dec13-11 10:21 AM
sabanation12
6 2,557
Hi. Just watched a Nova special with Brian Greene, "The Fabric of the Universe/The Illusion of time", describing...
Dec12-11 06:25 PM
cakewalk
29 4,855
Of all the models and theories that are being tossed about as fact, the one that I have the most trouble with is...
Dec12-11 01:38 AM
megacal
5 1,487
To my understanding, The Big Bang Theory (BBT) is considered the standard, mainstream theory explaining the origin of...
Dec11-11 04:48 AM
phinds
11 2,830
I'm just curious, what would it really take to travel to a parallel Universe? How much energy and what kind of...
Dec9-11 11:47 PM
Chronos
3 2,351
Hello, My question is regarding the speed of the Big Bang explosion. As I understand it, within the first 10...
Dec9-11 04:52 PM
Drakkith
25 3,356
http://www.tecca.com/news/2011/01/26/nasa-announcement-details-hubble-discovery-of-oldest-galaxy-ever-seen/ How...
Dec9-11 08:19 AM
Tanelorn
15 2,799
Hello~ I’m sorry. I can’t English well. 1. Assuming that total energy of universe is zero. It looks more natural...
Dec9-11 12:29 AM
Chalnoth
4 2,230
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 1,838
As universe is continuously expanding at the accelerating speed...expansion of the universe causes Redshift...the...
Dec8-11 05:07 AM
Chalnoth
7 1,688
i'm looking for computer simulations of expanding space. i made a couple of very very very simple models and my...
Dec6-11 06:27 PM
nearc
5 1,874
I have recently been watching the series "Into the Universe with Stephen Hawking" and I have a question (commence...
Dec6-11 02:22 PM
RobinSky
36 4,845
Hello, Has anyone read any good or interesting Cosmology books lately? Thanks
Dec6-11 02:07 PM
RobinSky
4 2,079
Hello: I am not a physicist or mathematician. I read that the universe is expanding and most pundits are 100%...
Dec5-11 10:48 PM
McCartney
6 1,947
I've been hearing that String Theory tied to eternal inflation seems to be providing support for the multiverse. But,...
Dec5-11 02:15 PM
dm4b
14 2,338
I've always wondered about this....if one sun over a certain size is enough (at the end of it's life) to become a...
Dec5-11 03:59 AM
Chronos
3 1,264
I have a theory about what dark matter and dark energy is and so far my theory can explain the % of dark matter, atoms...
Dec5-11 12:32 AM
twofish-quant
38 4,679
By now, I've listened several times to Brian Greene's talk about the OPERA experiment. And, although I largely agree...
Dec4-11 09:27 PM
Vanadium 50
23 3,691
Hello, I am reading this paper about quantum gravity, trying and failing to follow along in the derivation of this, eq...
Dec4-11 05:01 PM
Rettaw
2 1,417
It may be a silly question , but sometimes I ask it to myself : If the universe is expanding , throw what is it...
Dec3-11 02:49 AM
Deuterium2H
35 4,734
How come a "positive-energy false vacuum would, according to general relativity, generate an exponential expansion of...
Dec2-11 04:52 PM
Ken G
2 1,335
Sorry if this sounds a bit mixed up. When I was growing up, in the late 1990's, popular science books about...
Dec2-11 04:43 PM
Ken G
3 2,434
Am I correct in saying that in theory Time, Matter and presumably Energy are compressed to a singularity at the centre...
Nov30-11 10:10 PM
boson18
27 3,759
I was wondering because of my personal theories what others thought of the universe expantion. please help
Nov30-11 07:39 PM
phinds
4 1,196
It's funny how astrophysicists and cosmologists always debate back and forth about the ultimate fate of the Universe....
Nov30-11 11:43 AM
Calimero
11 1,896
Specifically, does our Universe exist on the inside "skin" of a bubble or the outside "skin" of a bubble? I'm sure...
Nov29-11 08:19 PM
phinds
1 1,254
Hello! I just want to start off by saying that I am no physicist or astronomer, so my apologies if my questions are...
Nov29-11 03:01 PM
phinds
4 1,229
What is the difference between a closed Universe and an open Universe? Please explain in layman's terms and describe...
Nov29-11 02:39 PM
bapowell
1 1,345
Could two Inflationary universes bumping up against one another result in the anisotropy seen in the Cosmic background...
Nov29-11 08:58 AM
Chalnoth
5 1,768
Sorry for the confusing title! I have a question that I cannot wrap my mind around... Suppose the universe attains...
Nov29-11 08:25 AM
Chalnoth
17 5,137
As we look out into space, soon we shall be able to see the last scattering in every direction. So my thinking is,...
Nov29-11 05:52 AM
Tanelorn
1 1,091
I'm not smart and know nothing of cosmology or physics but I seek an understanding of reality. I'm looking for the...
Nov29-11 02:45 AM
ThomasT
3 1,576
Talking about the big bounce and black holes in another thread made me wonder about the life span of black holes,...
Nov27-11 10:39 PM
edgepflow
4 1,962
I'm not a scientist, but I really enjoy reading the perspectives on these boards. I have some questions I hoping to...
Nov27-11 12:14 PM
nucl34rgg
26 6,227
Hi, There have been many excellent posts recently about entrophy in the universe ... some I've understood more that...
Nov26-11 11:00 PM
ThomasT
20 3,992
Hi. So if the space in the Universe is expanding, does that mean that the space existing between me and my monitor, or...
Nov26-11 04:44 PM
Chalnoth
34 3,620
We normally assume that the recession of distant galaxies is due to the expansion of the space between the galaxies...
Nov26-11 02:11 AM
Chalnoth
4 1,699

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