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- 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
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 41,259
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
492 159,240
hubble Hubble's law ( 1 2 3 ... Last)
I was reading one of John Gribbin's (popular science)books a few days back when I thought if there could be...
May21-06 03:27 AM
gptejms
77 6,477
Hi, I have a question... If I were to build a telescope that could produce images of things about say... 14...
May21-06 06:51 PM
matt.o
12 2,395
Hey, Was reading how the CMB is ~2.75 Kelvin, while the Neutrino BG is ~2 Kelvin. Clearly this means that neutrino...
May21-06 07:00 PM
marcus
6 1,724
The Robertson-Walker (RW) metric is, in a spatially flat Standard Model universe, a simplemodification of the...
May22-06 04:45 PM
SpaceTiger
26 5,144
We can probe the isotropy of the universe by observing the universe just from a single place. However, as I know, ...
May24-06 02:10 AM
Chronos
8 1,991
I read an article in this months Discover magazine that stated that cosmic rays are atoms of the elements from...
May24-06 11:18 AM
Qmon
6 1,797
Lawrence Krauss has a talent for writing a survey that makes a lot of stuff easier to understand. He's a world-class...
May24-06 11:24 AM
marcus
0 2,294
Hubble Constant=H distance = d recession velocity = v radius of Universe (light travel distance) = R speed of...
May24-06 02:18 PM
kmarinas86
2 1,354
Gravity is the only feild froce that can have an effect Dark energy. If EM and Gravity could be unfied could it be...
May26-06 08:20 PM
scott1
0 1,041
Trodden argues that particle physics and cosmology "no longer exist as independent disciplines" ...
May28-06 07:40 PM
marcus
0 2,378
My understanding concerning black holes is this: If there is enough mass (which means quite alot, in this case) with...
May30-06 05:38 PM
marcus
2 1,425
Whenever a diffuse gravitating system condenses into a stable and more compact object, energy must be removed from...
May31-06 06:56 PM
SpaceTiger
27 5,615
I know that electromagentic waves do not need any type of medium, but why wouldn't it be possible for dak matter to...
Jun1-06 05:36 PM
selfAdjoint
7 1,969
How to understand that the cosmic microwave background (CMB) can define a cosmological frame? Cheers!
Jun2-06 10:28 AM
marcus
3 2,200
Not being very mathematically inclined, I'm stumped with this one. Can anyone help? Imagine a toy “closed” universe...
Jun2-06 06:44 PM
pervect
1 1,160
I remember reading an article many years ago that there was a theory that part of the red-shift we observe from far...
Jun4-06 05:13 PM
SpaceTiger
40 6,524
I looked at a spectrogram of our sun several months ago. It contained a whole plethora of frequencies. It appeared...
Jun6-06 01:38 AM
Chronos
12 1,918
In another thread, someone was talking about cosmological expansion effects on planetary orbits. (Actually it was...
Jun6-06 06:52 PM
pervect
6 1,540
My friends and I just came across a discussion of the expansion of the universe. I am new to this subject and thus...
Jun7-06 02:01 AM
Balence
3 2,138
Greetings, I've heard something to the effect that MOND can explain the rotation of galaxies, but the article was...
Jun9-06 01:38 AM
EL
3 3,250
Was big bang a Black Hole Explosion? If the theory of the big crunch is right we can say that the big bang was a...
Jun11-06 01:55 PM
SpaceTiger
1 3,130
the big bang suggests that there was a huge energy density that exploded to create the universe my rather...
Jun11-06 02:11 PM
SpaceTiger
8 1,517
i all ways wonder this. what existed before the big bang?
Jun12-06 08:44 AM
string querry
42 7,946
Granted, the universe is expanding, granted the rate or speed is ever increasing, but what is the terminal velocity,...
Jun12-06 09:08 AM
ZapperZ
3 1,795
http://arxiv.org/abs/gr-qc/0606039 for something to gain visibility all it needs is people interested in proving or...
Jun12-06 10:15 AM
wolram
3 1,645
Light travel-time distance is handy for talking to journalists but it has problems that make it difficult to think...
Jun12-06 01:49 PM
string querry
9 2,145
Hi Friends, I just want to know how many of you believe that there is dark matter and dark energy in the universe...
Jun16-06 08:39 AM
brahma
45 7,609
Are there any well substantiated theories of Dark Energy? That is to say, well substantiated explanations of the...
Jun16-06 10:30 PM
kmarinas86
0 2,669
http://arxiv.org/abs/astro-ph/0505036 http://www.universetoday.com/2006/06/12/gigantic-ball-of-fire-discovered/ ...
Jun18-06 06:12 PM
marcus
2 1,507
To what degree is the microwave background radiation isotropic to its precursor, neutrino production?
Jun20-06 01:17 PM
SpaceTiger
3 1,717
I have only one question at the moment which im pondering over. Now im aware the the Laws of Physics govern most...
Jun21-06 12:58 AM
Mariko
5 2,153
Oldman asked an interesting bunch of questions, which at the time i could not reply to because of the context ...
Jun21-06 01:52 PM
marcus
19 2,006
In order to speed up an insight into this question, which I posed to myself, I try PF to give me one or more...
Jun21-06 11:33 PM
Chronos
1 1,685
Hi guys, I've been working on a theory for a bit and am wondering what you guys think. So here it is: Summary ...
Jun22-06 05:26 PM
chroot
1 3,603
Hello I have recently read an article about tensor vector scaler theories (Te VeS), including John Moffats STVG and...
Jun23-06 12:27 PM
marcus
5 1,842
How do we know that a photon coming from a far away star is redshifted? Since we only can measure wavelength here on...
Jun26-06 05:40 AM
hurk4
12 1,822
How do you imagine a finite universe ? i find it very difficult.
Jun27-06 12:19 PM
SpaceTiger
71 7,312
Most structures we see in the universe are of a spherical or circular nature. However, our universe is most likely...
Jul8-06 03:25 AM
Chaos' lil bro Order
4 1,548
I had a thought the other night when I heard that there is a super massive black hole at the center of every galaxy. ...
Jul8-06 05:15 AM
matt.o
3 2,027
http://arxiv.org/abs/astro-ph/0606048 About universes with scale-related total masses and their abolition of...
Jul8-06 05:42 PM
Gate2
7 1,472

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