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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
493 166,112
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 44,993
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 5,073
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 1,080
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 1,560
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 1,935
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 6,151
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 3,939
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 3,563
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 1,675
The other day I saw Michio Kaku saying scientists now think that the universe "may have" started from being puked...
Nov25-11 12:43 PM
marcus
24 2,892
Hi, I am new to this forum, Basically I am not a scientist(not at all), like others in the forum, I belong to...
Nov24-11 07:08 PM
adaptation
16 3,781
How can people measure the Hubble's constant using WMAP? I found a journal named First-Year Wilkinson Microwave...
Nov24-11 11:13 AM
Chalnoth
11 2,666
Can the name of the scientist who discovered the concept of a collapsing universe, also known as a 'Big Crunch', be...
Nov24-11 11:08 AM
Calimero
1 1,116
Hi there. I've been watching some documentaries on the Big bang and the laws of nature. One particular interesting...
Nov24-11 06:12 AM
Chalnoth
18 3,810
I'm not sure how popular this theory is, but it kind of makes sense to me that as the Universe approaches the Big...
Nov23-11 04:47 AM
Drakkith
6 2,526
I'm sure this is a tired question but I'm curious...if I were able to escape the boundary of the Universe, what would...
Nov23-11 12:32 AM
ThomasT
2 2,943
1. What's the scale of these simulations? That is, do they extend beyond actual observational data? If so, approx....
Nov23-11 12:19 AM
ThomasT
0 1,144
Hello fellow Cosmology fans and professionals! Does Dark Matter form into Black Holes, and do regular Black Holes...
Nov22-11 05:37 PM
Chronos
5 2,620
If someone in a distant stars is watching for signals of life coming from other planets, how far did the signal of...
Nov21-11 08:32 PM
Chronos
2 1,297
Hi, I am currently reading Liddles Introduction to Modern Cosmology (2nd Ed) and having trouble with problem 8.4,...
Nov21-11 08:32 PM
cepheid
3 1,721
I say always that the universe has expanded, from an initially-hot and dense state, until it get its current forme......
Nov21-11 01:40 AM
houhou.trad
3 1,508
According to Misconceptions about the Big Bang in Scientific American by Charles H. Lineweaver and Tamara M. Davis,...
Nov20-11 03:18 PM
RUTA
15 3,466
In an earlier thread--What is space?--a few people indicated that only a part of our universe is observable: Because...
Nov20-11 09:23 AM
Tanelorn
19 2,752
question 1. i need some help understanding this. it is proven that the universe is infinitely expanding correct? what...
Nov19-11 12:27 PM
juanrga
17 3,751
There are two representations of blackholes that I see in the popular media. Could you help me find the answer to a...
Nov19-11 05:34 AM
Hjarloprillar
7 1,692
Hi. Just read this article regarding test with neutrinos that suggest they travel faster than light. ...
Nov18-11 08:40 PM
ZapperZ
2 1,489
In writing a science fiction novel, I set it against a backdrop of the Oort cloud and, as part of the plot, I needed...
Nov18-11 12:42 PM
Vanadium 50
3 1,881
After reading about the expanding universe, and the balloon analogy, I found myself wondering about some things. Like...
Nov18-11 10:14 AM
jtbell
23 11,690
Im very new to astronomy and astrophysics, so this may be a very simple question. I read somewhere that astronomers...
Nov18-11 09:27 AM
John15
9 3,022
Can the amount of space/time warped by a black hole be measured and if so, where can I find measurements of previously...
Nov18-11 01:24 AM
Chronos
5 1,188
The Hubble parameter is defined by: H(t) = a'(t) / a(t) where a is the scale factor which is a function of...
Nov17-11 11:52 AM
Chalnoth
10 2,439
I was reading news article: http://www.sciencedaily.com/releases/2011/11/111115095911.htm Article explains in...
Nov17-11 07:04 AM
D H
6 1,848
Hi. I've always been fascinated by black holes. I have recently leared something new about them. It is regards to...
Nov16-11 09:26 PM
alex2515
0 1,137
There have been a couple of posts over the last few months that posit a relativistic-speed path in a circle around the...
Nov16-11 09:16 PM
ThomasT
16 2,323
Hello. This is my interpretation of what is currently known in cosmology, as regards the low entropy state of the...
Nov16-11 09:07 PM
alex2515
17 4,238
I am no expert on cosmology. But from what I have heard, the big crunch is the scenario that will most likely happen...
Nov16-11 07:07 PM
bapowell
2 1,166
I was wondering two hings. First, does light's energy equate to mass and result in the bending of space time? The...
Nov12-11 12:54 AM
Chalnoth
2 1,716
http://www.physorg.com/news/2011-10-supernovae-universe-expansion-understood-dark.html Your input, please!
Nov11-11 03:12 PM
RUTA
10 4,280
From all my research and studies mathmatical evidence shows the existence of Black holes. From some of the most...
Nov11-11 02:46 PM
russ_watters
45 4,652
I read an article the other day by a physicist who said there are only four forces and for the first time in my life...
Nov11-11 10:02 AM
Chalnoth
35 3,384
This is a question about the borders of the Universe (if such a thing actually exists). I got in a discussion with...
Nov11-11 08:12 AM
DaveC426913
5 1,941

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