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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
493 166,564
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 45,192
The relativistic pulsar-white dwarf binary PSR J1738+0333 II. The most stringent test of scalar-tensor gravity ...
May8-12 03:32 PM
lpetrich
1 1,145
Standard point of view: When we look at distant galaxies, we see that redshift is higher then expected so we conclude...
May8-12 06:31 AM
Chalnoth
36 3,594
New thread continuing a topic raised in 'Physical Space Properties Question' Okay, so I saw on wikipedia that you...
May7-12 08:54 AM
nnunn
6 2,678
Hello all, I have a series of questions relating to the Big Bang and Inflation! First, a disclaimer: I am a...
May7-12 07:45 AM
bapowell
25 2,302
There is a video on youtube called how do we know the universe is flat. (put those keyword in youtube and you should...
May7-12 05:08 AM
Chronos
2 1,093
Dear All, I am new to this forum and hasten to add I'm not a Physicist. I'm a medic. I have read some of the...
May6-12 08:38 PM
Naty1
17 2,706
Hello All, I wondered if anyone could fill in some details about the timeframe of FRW derivation. Was it derived...
May5-12 06:36 PM
phinds
3 990
Sean Carroll chimes in on the idea of a Universe from Nothing, and I get a feeling that many people who browse this...
May4-12 01:12 PM
marcus
24 3,137
I think the picture explains it better than I can with words. Is it possible that we can only see a small sphere...
May4-12 10:31 AM
Cosmo Novice
5 1,375
The earlier thread was closed for some reason. It prompted this question: Given the formula for CMB temperature...
May4-12 07:32 AM
Ich
5 1,111
http://www.eso.org/public/news/eso1217/ ...
May3-12 11:45 PM
Chronos
25 4,505
In Wikipedia article dark matter, there is a picture that shows us the proportion of matter and energy in the current...
May3-12 03:02 PM
Naty1
2 1,085
Just watched Stephen Hawkings "The Story of Everything". Maybe it's outdated by now, maybe not. Still beautiful to...
May1-12 05:23 PM
Vanadium 50
35 5,367
The Friedmann–Lemaître–Robertson–Walker metric is a solution of the field equations of GR. It tells us the local...
May1-12 04:31 PM
marcus
3 1,137
If we know that the temperature of photons was apprx. 3000 K at recombination and the temperature of the CMB is apprx....
May1-12 09:43 AM
marcus
11 1,653
hi, I am a bit confused on what the current model of the universe is. some are saying it is round, while others are...
Apr30-12 02:06 PM
George Jones
39 5,737
The Hubble radius R is defined by: R(t) = c / H(t) where H(t) is the Hubble parameter which is a function of...
Apr29-12 03:51 PM
johne1618
5 1,068
Okay i want to stir something up....do we earth dwellers move around the sun in a roughly circular path (ellipse) OR...
Apr29-12 09:13 AM
spark802
16 2,227
So I know that when a massive star stops creating nuclear fusion the star collapses on itself from the gravity and...
Apr28-12 07:49 PM
Snowgooned
13 5,814
When we "measure" time, we are obeserving movement, really. Or aren't we? Is there a physics theory where time...
Apr28-12 06:22 AM
ZapperZ
149 13,275
Has anyone thought about the big bang and dark energy like this? Dark energy is simply empty space which has the...
Apr27-12 11:00 PM
Chronos
21 2,300
wikipedia says: "The CMBR has a thermal black body spectrum at a temperature of 2.725 K, which...
Apr27-12 04:43 PM
Nabeshin
1 1,189
Hello everyone, glad to be here. I'm Tom, 22 from Manchester UK. I don't consider myself intelligent, I failed...
Apr27-12 02:12 PM
mfb
15 1,979
Do theories of quantum gravity require that space-time is a lattice instead of a continuum? I guess this question...
Apr26-12 04:22 PM
Naty1
2 1,247
hello, I'm wondering how to calculate, even approximately for the relatively mature universe, what the CBR...
Apr26-12 03:18 PM
Ich
8 1,421
Good evening. I am wondering if energy has always been quantized. I read that the shortest time after the Big Bang...
Apr25-12 10:51 PM
CarlosLara
2 1,203
Some background: I am a senior in high school taking astronomy, so admittedly i do not know much about the structure...
Apr25-12 05:49 PM
00Svo
26 3,237
I have no formal training in physics beyond the basics, so if my questions make no sense, feel free to ignore them. ...
Apr24-12 07:40 PM
Chronos
10 1,911
According to the Inflation Theory our Observable Universe is but a small part of the total universe created in the Big...
Apr24-12 06:03 PM
Mark M
1 946
I've got to write a speech for Public Speaking and the topic is "Time waits for no one" and I was wondering if anyone...
Apr24-12 08:59 AM
balaonspace
2 1,335
I've had a theory lingering in my consciousness for a long time. I've wondered about the relevance between the...
Apr24-12 07:48 AM
Lino
9 3,943
Quick question from a newbie, was the inflation of the universe faster than the speed of light ? Having heard about...
Apr24-12 06:56 AM
bapowell
20 2,579
People tell me that we cannot extend our inertial frame, as defined in special relativity, across the Universe because...
Apr24-12 06:51 AM
Chalnoth
5 997
If the universe is finite, what would its total volume have been at t = 1 s?
Apr23-12 03:26 PM
Drakkith
19 2,745
we are currently learning about radioactivity and i have become curious of how these heavier elements came to earth in...
Apr23-12 02:42 PM
Naty1
6 2,445
I am examining various models of eternal inflation and I want to double check one of my assumptions, which is that...
Apr23-12 02:16 PM
Naty1
5 2,158
Why do astronomers and cosmologists prefer to use the Distance Modulus instead of -- rather than in addition to -- Bly...
Apr23-12 03:18 AM
clamtrox
3 1,293
Could the cosmological redshift be explained also as a change of the fundamental physical constants with distance? Say...
Apr22-12 10:05 PM
marcus
5 1,790
Let us suppose that there is no largest space or no smallest space as it relates to the universe. If this were the...
Apr21-12 08:24 PM
Bobbywhy
2 1,384
To start, lets say I took a bowling pin and passed it through a two-dimensional universe. An observer in the...
Apr21-12 03:48 AM
Dickfore
1 974

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