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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
493 165,586
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 44,668
Dark Energy is concept of total nuisance to physicist, deriving no crystal-clear concept to stand on. So why are...
Jul3-14 11:10 AM
Chalnoth
15 1,954
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 2,099
If there are so many galaxies in the universe,Why don't wee see a night sky with full of light(from the galaxies or...
Apr22-13 11:48 AM
Chronos
8 747
What could have been happened in the bigbang.If there were an observer what would s/he see. And were there absolutely...
Apr22-13 03:05 PM
skydivephil
5 603
I often hear creationists claim that the Big Bang Theory states that something came out of nothing and exploded....
Oct8-09 01:10 AM
DaveC426913
6 1,569
Hubble discovered that galaxies are moving away at each other at a rate, today physicists believe that this rate is...
Nov2-09 03:02 AM
Wallace
2 1,032
I've heard claims that the Big Bang defies the law of conservation of angular momentum. For example, not all planets...
Nov29-09 05:08 PM
justwondering
9 6,748
Interesting article in Newscientists, thought I'd start a discussion... ...
Dec23-10 04:40 PM
Kevin_Axion
1 1,181
I'm trying hard to find a decent explanation for someone that an expanding universe doesn't mean that galaxies get...
Jul10-08 11:30 AM
cristo
19 10,008
Where is the edge/boundary of the universe may sound like a simple question but I can see 3 possibilities. 1...
May13-13 05:09 PM
Spourk
133 8,518
I have recently come across a new theory about the formation of the moon. It says that the Earth was rotating faster...
Nov11-13 08:11 AM
D H
2 1,058
i would like to know how to explain the beginning of universe and during high collision of high energy particles by...
Apr5-06 10:21 PM
marcus
3 2,350
The title says it all. With all that mass in such a small space it must have been one, but then everything would have...
Mar16-11 07:58 PM
bcrowell
43 6,723
I've just been reading some of these threads, as i am quite interested in cosmology. I was wondering about a possible...
Nov3-06 06:21 AM
EL
6 1,702
Hey everyone, I have a limited knowledge in this field, but am very interested in it and am able to understand the...
Feb11-10 10:45 AM
Aero_Marty
9 2,003
i was searching for the exact specifics of a type III civilization when i came accross this serious news artical ...
Feb6-06 11:58 PM
Chronos
3 2,593
I have a question concerning what has been proven about the properties of light over billions of years and billions of...
May30-11 04:16 AM
Chalnoth
4 1,696
In this thread I would like you to add some more detailed information on what the people behind the new physics prize...
Oct5-11 04:10 AM
Chalnoth
2 1,217
Hi. I am new to this forum and was wondering if anyone can answer my question. What caused the physical laws we...
Apr1-09 12:27 AM
Fra
40 3,654
Photons must have a certain amount of energy to be absorbed by an electron. A photon with a little too much energy to...
Aug12-10 04:40 AM
Vanadium 50
7 2,778
My standard disclaimer (this is my second post now): "I'm not a physicist... I'm not a mathematician... I'm not even...
May13-11 01:03 PM
phinds
5 1,400
Okay, so being fourteen, I know that I'm way out of my league on this forum. I do my best to understand anything to do...
Jan8-09 10:23 PM
marcus
9 1,538
Regarding the Universe's expansion being faster if the subject is further away from the observer, would it be fair to...
Jan7-09 06:17 PM
aguycalledwil
0 1,127
I have been thinking about the idea that the universe is infinite in size and have wondered if it is not also possible...
May31-13 10:49 AM
Naty1
8 936
Hello, I hope you don't mind a question from a complete novice and someone not related to physics at all. I am...
Oct12-11 09:55 AM
aherrera
7 1,354
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 1,321
I've read through a lot of the other MOND vs DM debate threads, but I was wondering whether or not this has been...
Jun20-08 01:42 PM
LowlyPion
18 3,254
When cosmologists talk about "late times" do they mean post-recombination and pre-Lambda domination or what?
Aug22-11 10:00 PM
Chronos
1 1,384
It turns out that galaxies from over 12 billion years ago are anything but small and young. ...
Jan8-10 08:00 AM
sylas
7 1,741
This has been puzzling my mind for a long time. How do we really know the universe is expanding? Based on observation?...
Jan14-10 12:38 AM
Chronos
6 1,292
Sorry 'bout posting so many topics but there are too many things that are unclear to me. CMBR measurements suggest...
Jan13-10 04:50 PM
Skolon
6 2,120
We always get to know that there could be other 'multiverses' with completely different physical constants, but I'm...
Apr16-12 04:23 AM
Aidyan
13 1,817
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 1,776
What does most evidence point to regarding the reasons for Sedna's looong orbit? I think it highly unlikely that the...
Jul14-10 12:30 AM
Chalnoth
6 1,512
Random musing: Could it be that sufficient expansion of the universe that leaves behind only black holes that have...
Aug6-12 06:26 PM
Quantum Kid
1 1,155
This is something I thought about while drifting off to bed last night. Immediately after the period between the...
Jun2-09 09:10 AM
ajassat
3 1,378
Assalamualykum Iím a non-math person, but that doesnít deter me from being logical and rational who churns out...
Mar20-11 07:20 AM
ZapperZ
20 3,002
Hello. I have been working through some questions and answers to do with cosmology. One of them asks you to...
May13-11 01:09 PM
George Jones
8 1,929
Recently, I've taken an interest in Astronomy and decided to become better equated with the night sky. This of course...
Apr25-11 07:39 PM
cepheid
3 1,148
As speed of galaxies is proportional to distance. Can we assume some galaxies have speeds grater than c? And do they...
Jun6-11 08:24 AM
Chalnoth
7 2,206

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