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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
Jun25-11 08:50 PM bcrowell 
Meta Thread / Thread Starter Last Post Replies Views
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...
Jul10-14 01:18 PM
marcus
491 150,372
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 37,079
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 7,377
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 1,985
How can we be sure that the Cosmic Microwave Backgound Radiation is a relic of the big bang and not a reflected echo...
Mar29-07 09:02 PM
cosmopot
15 2,957
From what I understand, black holes can generate gravity-waves in orbit with each other. But can they absorb them? ...
Jul3-10 05:51 PM
brainstorm
2 1,534
I have heard numbers like our Universe is 75% Dark energy, 25% Dark matter, and 5% baryonic matter or something. For...
Jan27-09 09:13 PM
Chalnoth
12 1,569
Hi, My name is Brandon, Im new here. My physics knowledge mostly comes from surfing the net, so I have a lot of...
Oct8-10 03:56 AM
Ich
4 1,963
I have trouble understanding the following. Lets take 2 galaxies moving away from each other caused by the...
May20-14 07:21 PM
Simon Bridge
8 505
Hello, I was pondering the age of the universe and reading about how it was calculated, but then I began...
Jul29-10 03:02 AM
Ich
4 3,382
Could it be possible that gravity is the reason why the universe is expanding? When stars die and some create...
Jul12-08 02:22 AM
Garth
6 1,808
I have heard statements made that at the instant of the Big Bang, the entire universe was condensed into an incredibly...
Aug25-11 03:29 PM
phinds
26 3,804
I was reading Ned Wright's cosmology tutorial ( http://www.astro.ucla.edu/~wright/cosmo_02.htm ), and I'm a bit...
Jun30-07 12:31 AM
Chronos
8 2,125
I have been searching through some of the literature, as well as this forum - but I have not found a clear explanation...
Mar24-14 11:56 AM
Brinx
0 433
If space is expanding then how did the planets and stars come together to form galaxies? Why are the galaxies...
Jul22-12 09:28 PM
phinds
21 2,379
Hi what constitutes a vacuum? I mean it has to be made of something, since it it part of the space time continuum. In...
Mar20-13 12:13 PM
ikjyotsingh
8 1,790
I was wondering what caused the big bang? The expansion would need some energy to start wouldn't it?
Jun3-10 11:13 PM
Chronos
7 1,209
Just curious about how people think the universe will end.
Jun17-10 07:21 AM
nismaratwork
22 2,686
I was watching a video on the JIMO mission to Jupiter's moons: Ganymede, Europa and Callisto. What is the approximate...
Jun9-10 09:49 PM
stevenb
2 1,052
How was matter created in this universe? If the Higgs Boson is theoretically able to create matter from energy,...
Sep12-10 04:27 PM
friend
2 977
What exactly is going on in physics and with the standard model of cosmology? We had a model that seemed to...
Aug17-10 11:32 PM
Chronos
11 1,878
What's the probability of a universe capable of life? In other words, what's the probability that the laws of the...
Jun15-10 04:56 PM
Chalnoth
15 2,012
Last night while thinking about galaxies with seemingly large DM halos and me being the skeptic of DM as I am, I got a...
Dec18-11 02:48 AM
Markus Hanke
13 2,804
What experimental evidence or optical measurements are used to prove that red shift is due to gravitational fields of...
Oct10-11 10:05 AM
marcus
26 3,607
What is wrong with assuming a fixed size universe, dividing it into 8 octants, and allowing the various octants to...
Oct9-11 09:17 PM
George Jones
7 1,459
With 90% of the observable matter in the universe being Hydrogen (H2), why is it that the microwave background is...
May19-08 01:12 AM
pixchips
6 4,013
Hi clever people. much respect. Just wondering, if our closest star went super nova. how would it affect the earth,if...
Jan16-12 05:01 PM
cmb
20 4,393
I am a molecular biologist but cosmology is my "hobby". I have some questions about some seeming inconsistencies I...
May22-10 09:18 AM
emc2cracker
2 1,060
I came across this article online recently and found it interesting. I thought I would share it since many members...
May12-09 03:32 PM
buffordboy23
4 2,953
Here it is, its probably an old one but as im not a fully fledged scientist I dont know if it is. It relys on paralel...
Jan18-11 11:14 AM
burgerdave
7 1,687
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 2,987
Hey all, Just to make it clear I am in no way a scientist or physicist but a mere space enthusiast. Yesterday I...
Jan27-13 09:41 AM
Naty1
3 745
I was reading that the universe will repeat after its done. http://seedmagazine.com/content/article/a_cyclic_universe/
Jul1-11 11:46 AM
bcrowell
15 2,130
Wouldn't the Doppler effect stop us from seeing the beginning of the universe unless it starts approaching us? (or...
Jul22-08 05:01 PM
marcus
11 1,713
Should not we say "the universe WAS expanding" rather than "IS expanding" since the red shift augments as we go back...
Jan17-13 05:59 PM
GeorgeDishman
96 13,768
Why is not gravity relative like the space-time continuum, since it operates on and is modifying it? Why is gravity...
Apr8-12 10:46 PM
Nabeshin
18 2,422
Before I post the question, I must state for the record that I am a grunt so please be gentle with me. My question is...
Jun6-09 10:33 PM
Chalnoth
8 1,394
I would first like to thank everyone on this website. So much knowledge i haven't been able to leave. Im researching...
Feb22-11 11:08 PM
cepheid
3 1,682
I doing research on the state of the universe before and after Inflation for a science fiction book im writing. In...
Apr16-11 04:15 PM
bapowell
25 2,967
Ok so I'm a bit confused as to how to attempt to answer this question? Describing its significance vs explaining its...
Apr6-14 10:02 PM
marcus
9 552
Please clarify and tell me where I am wrong. Before the big bang Time did not exist, nor mass, nor energy, nor...
Mar18-09 04:27 PM
marcus
3 1,300
What is the ratio of energy contained in photons vs energy contained in neutrions in the present universe? Also, how...
Oct4-11 02:29 PM
nicksauce
4 1,597

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