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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...
Jul25-14 06:02 PM
marcus
492 161,502
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 42,463
Ho :), I would like to know how exactly stars and galaxies are spread out throughout the universe. Are...
Mar28-10 08:18 AM
graybass
2 906
First let me state my current understanding so that I can be corrected if not on the right page-- Given "zooming out"...
May22-12 06:57 PM
QuestionMarks
15 1,650
Let's assume as per the anthropic principle, for the mere sake of argument alone, that the physical constants of the...
Jan23-14 01:33 PM
Chalnoth
44 3,126
I've been mauling some questions about the end/edge of our universe in my head over the last couple hours, and Google...
Mar25-12 09:13 AM
Quiksilver421
4 1,192
and is my new thinking , which is taking me down a path of thought that, if objects in the observable universe...
Apr25-11 10:04 AM
bcrowell
44 5,231
If the Universe is 96 billion light years across and 13.7 billion years old, then doesn't that mean that the Universe...
Feb7-08 09:09 PM
drewterry
9 3,042
I'm aware I'm raising a topic which must have been discussed several times, but I couldn't find anything specific to...
Apr13-12 01:59 PM
Mark M
16 2,628
I guess I don't have much to say about this other than it's pretty amazing if it's true and I wanted to bring it to...
Sep16-10 04:43 PM
cristo
1 1,069
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 1,192
The concept of spacetime ripping or breaking (down) is common in science fiction, but does it have any basis in real...
Oct10-12 03:18 AM
Chronos
3 2,442
To Support the Theory of going into another dimension by travelling through a Black Hole. Since Scientists say you...
Aug8-07 02:34 AM
raccoon
22 4,230
In the beginning I have heard that the big bang came from an exploded singularity. What was this some sort of vacuum...
Sep8-06 11:39 PM
Chronos
3 1,770
Hello! I want to get my data in terms of h70 -1 Sometimes the estimates are in terms of h50 or h70, and I know...
Mar2-10 08:41 PM
cepheid
3 1,739
Hello!:wink: May I ask for a little assistance in filling in the gaps of my understanding? :S I understand that...
Mar4-10 09:23 AM
Radiohannah
5 1,708
Hello! :-) I've been thinking about the RW line element (c^2 d tau^2), and I understand that there is a term which...
Mar29-10 08:14 PM
Chalnoth
7 1,681
Hey I'm getting very muddled with my units, and would really appreciate some clarity :-) I have angular...
Mar1-11 06:55 AM
Radiohannah
2 1,294
Just a thought I literally just came up with sitting here on a Sunday morning after having joined this site about a...
Jul4-08 04:20 AM
robheus
36 3,423
If my understanding is correct, they use shapes of things great distances apart and they compare certain properties...
May26-12 08:54 AM
Farahday
17 2,210
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 1,686
I would just like to ask a very elegant question. What is the shape of the universe?
Dec6-10 08:30 AM
DaveC426913
29 6,530
Is it reasonable to assume that if there are areas of space that are causally disconnected from us because they are...
Jan16-06 07:08 PM
SpaceTiger
14 2,101
I was trying to find an updated view on the plausibility of the Big Freeze. I believe that a couple of years ago, it...
May9-13 06:57 AM
bapowell
2 1,005
Hi, I was reading an article on physorg, as I often do, when I stumbled on something that both confused and...
Nov22-10 08:36 PM
bombadil
2 1,852
Hey, After watching a show on TV about expanding universe and dark matter&energy, I wondered the following. In...
Aug31-10 11:50 AM
Chalnoth
6 1,852
Last year Astronomers observed a self-destructing star 13.1 billion light years away. Happening only 630 million years...
Jan5-11 07:35 PM
hadsed
14 2,030
What evidence is there that throughout most of the history of the universe , it has been decelerating?
Nov24-07 09:00 PM
Wallace
9 1,794
what is the best estimates on the number of neutrinos in nature?
Nov24-07 07:35 AM
GleefulNihilism
5 1,930
We ususally find the age of the universe : T=1/H , is this true for all geometries of the universe,,, say for example...
Nov27-07 09:14 PM
SpaceTiger
11 1,919
what's the maximum area of an equilateral triangle that can be drawn on a positive curvature?
Jun16-08 04:04 PM
MiltMeyers
2 1,252
From a thread on “void theory vs. acceleration” (link in quote below); Rather than hijack the other thread for more...
Nov11-08 08:17 PM
marcus
4 2,148
I know that a Hypernova release two huge jets of gamma rays, but I'm not real sure on how they are formed. Also it was...
Jun28-09 03:34 PM
randeezy
6 1,558
Ok, I feel like an idiot, but can someone remind me how you prove mathematically z = v/c? (z is redshift, v is...
Nov20-08 09:00 AM
Randomguy
2 4,111
I'm sure I'm making a plethora of naive assumptions in this question, but I was just thinking that the Big Bang, or...
Nov4-13 06:57 AM
bapowell
13 1,483
Hey, I was just thinking and wondering if beyond the boundaries of our universe, (if there were boundaries) if it...
Dec16-10 01:10 PM
Tanelorn
4 1,905
I've been hearing these talks that the sun will run out of hydrogen in 4.5 to 5 billion years from now. My question...
Dec16-06 09:42 AM
russ_watters
3 5,639
I wanted to know a bit more about the fact that in the presently accelerating expansion of the universe the Hubble...
May8-09 01:13 AM
Chronos
8 2,484
I have read that "the cosmological constant introduces a force of repulsion between bodies. The force increases in...
May19-09 07:55 AM
Ich
12 2,214
When the universe started expanding at the big bang, was it mainly driven by the force of the big bang ? Does dark...
Jun14-09 08:11 AM
Naty1
1 959
When did the accelerating expansion of the universe start?
Jul2-09 07:16 AM
Chalnoth
5 1,688
Cosmological constant dark energy has equation of state parameter = -1. What is the equation of state parameter of...
May11-10 02:20 PM
Chalnoth
8 1,945

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