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Quality answers to common cosmology questions
Jun25-11 08:50 PM bcrowell 

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Cosmology

- The origin, evolution, structure and eventual fate of the universe.
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To have an enjoyable cosmo forum we needed a balance between mental freedom on the one hand and a shared knowledge...
Apr8-14 08:39 AM
Jorrie
483 125,521
The new A20 tabular calculator lets you look at changing geometry out to about 88 billion years according to the...
Feb8-14 08:31 AM
mfb
61 23,586
If our universe is expanding and light travels at a finite speed, then, will there be a time in future, where we won't...
Mar15-06 03:26 PM
kmarinas86
17 2,825
Hello, I'm new here and I have a question I hope you might help me with... Might "dark energy" be a natural...
Feb9-06 10:52 PM
ubavontuba
65 6,717
Suppose the universe is bounded and not infinite, would it require more dimensions for the universe to curve back upon...
Feb15-06 06:31 AM
Garth
20 2,957
Hi all, I was wondering what some of you thought about 'Information Theoretic Process Physics'? The topic seems...
Mar5-06 06:15 PM
yanniru
2 2,761
Kaku's 'Hyperspace' is currently inspiring my higher-dimensional imaginings. I'm trying to imagine what one would see...
Feb9-06 01:10 AM
Chronos
10 1,697
What is the difference between particle horizon and cosmological event horizon?
Feb9-06 01:29 AM
Chronos
5 1,937
This should throw another spider into the web: http://www.physicsweb.org/articles/news/10/2/4/1 As far as I can...
Feb25-06 11:41 AM
ubavontuba
37 4,187
Lambda (the cosmological constant) is frequently refered to as a sort of "negative gravity": instead of attractive...
Feb12-06 02:02 AM
Chronos
2 1,407
Hello all... Hope you'll allow a complete novice to sneak in for a moment or two with a couple of questions: ...
Feb13-06 04:16 AM
hellfire
2 1,647
Please help.... This is what I came up with on my own and I was wondering if there is already a thought process or...
Feb14-06 01:09 PM
Nereid
2 2,770
Scientists occasionally take the time to give planetarium level tours. I'm particularly fond of these papers. They...
Feb18-06 11:12 PM
Chronos
0 1,108
Hello, I think this is a good theoretical question (hypothetical question) to ask. What I am interested in figuring...
Mar19-06 07:48 PM
Fredrick
12 1,923
I have long wondered about this. When light takes x number of billion years to reach earth, we judge that the star...
Mar4-06 01:09 AM
Chronos
8 2,903
http://www.newscientistspace.com/article/dn8766.html :uhh: I wonder what hapens when unvisers crashers into...
Feb23-06 06:55 PM
scott1
0 1,485
http://arxiv.org/abs/astro-ph/0602519 Authors: H. Balasin, D. Grumiller Comments: 11 pages revtex4, 4 eps figures...
Feb25-06 01:30 AM
Chronos
2 1,784
http://arxiv.org/abs/astro-ph/0602500 Authors: Ari Brynjolfsson Comments: 8 pages, 4 figures, presented at APS...
Feb25-06 01:23 AM
Chronos
5 2,101
Einsteinís relativity states that gravity propagates at the speed of light. How can a black hole have a gravitational...
Mar4-06 06:26 PM
joeljen
2 1,934
A recent study using the VLT array has measured the temperature and size of dark matter clumps. Interestingly enough,...
Mar2-06 12:17 AM
Chronos
5 1,837
Hi all, I'm currently taking a course in introductory cosmology, last quarter I had an introductory course in...
Mar5-06 11:38 AM
SpaceTiger
3 1,826
What force is stronger, Gravity or Magnetism? I know that magnetism in general is stronger here on earth but what...
Mar12-06 01:34 AM
WARGREYMONKKTL
6 6,056
So when photons are created they carry the energy away from the system at the speed of light, so basically can you...
Mar5-06 01:58 AM
Chronos
4 3,980
There are several pieces of evidence to suggest that DM is a real artifact of the universe. 1. Nearly flat rotation...
Mar6-06 02:18 AM
Garth
0 1,172
What chances would you give the different candidates to actually make up (the major constituent of) the dark matter?...
Mar16-06 01:31 AM
Chronos
76 5,165
I was just thinking that whether changes have any speed. Suppose we have a system in which a bodyA is rotating ...
Mar13-06 05:29 AM
Excellence
4 1,515
Dark energy: Mystery of the Millenium T. Padmanabhan http://arxiv.org/abs/astro-ph/0603114 This is an impressive...
Mar9-06 01:28 AM
Chronos
5 1,864
I have a question I've wondered about for some time. When astronomers say the furthest objects seen are roughly 13 -...
Mar21-06 01:26 AM
Chronos
8 1,507
Hello. I am just curious if anyone else imagines what I imagine whenever I hear about the universe expanding at an...
Mar16-06 01:20 AM
Chronos
2 1,610
Okay, I understand that the universe is expanding. I also understand that in 1998 Cosmologist discovered that the...
Mar17-06 05:20 AM
hurk4
2 1,263
Specifically LGC is dual to RS theory with an extra (large) time-like dimension, as reported by Parampreet Singh today...
Mar15-06 01:48 PM
selfAdjoint
1 2,544
Hello, All, I hope I am not out of line here, this is the only cosmology forum I could find to ask a few...
Mar17-06 01:32 PM
chroot
9 1,525
The newly release WMAP data supports the Inflation model that the universe expanded from subatomic scales to...
Mar17-06 03:36 PM
ray b
2 1,836
Given that Dark energy supplies negative pressure: Does it have mass? Does it curve space? If so, does it help to...
Mar31-06 02:59 PM
Troposphere
10 2,738
Regarding Universe Expansion: Does the fabric of SpaceTime play a role in regulating the expansion of the universe?...
Mar20-06 09:49 PM
Prairie
3 1,449
Hey, I read about arbitrary elements sometime ago. Could anybody tell me what affects the values of these? And I also...
Mar21-06 06:08 PM
Soul Surfer
2 2,017
(if) our universe is closed and finite, would it become (soaked) in radiation more readilly than an open infinite...
Mar22-06 02:35 PM
SpaceTiger
1 1,170
http://map.gsfc.nasa.gov/m_or/PressRelease_03_06.html Perhaps expansion has been going on forever and size...
Mar26-06 07:01 PM
Nereid
2 1,338
What are the (basic) problems with main stream theories of cosmology ? i do not want crackpotery, just what the...
Mar29-06 01:02 PM
wolram
33 2,999
I know that inflation is the rapid acceration of space some time after the big bang, but are there theories that...
Mar26-06 12:21 PM
SpaceTiger
1 1,505
In case anyone is interested, here is a new paper just out. Any comment? http://arxiv.org/abs/astro-ph/0603637...
Mar29-06 11:45 AM
marcus
8 1,704
Here is an interesting paper, IMO: The Hubble Constant: A Summary of the HST Program for the Luminosity...
Mar29-06 12:54 AM
Chronos
4 1,785

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