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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
483 125,253
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 23,435
I hope this makes sense. When the bang event occured and pushed everything outwards, shouldn't a space/field start...
Nov12-12 05:44 PM
marcus
4 1,183
Hello everyone, before I start, I just want to say I feel a little out of place here. I am not a student of physics or...
Jul9-09 11:17 AM
malawi_glenn
17 1,589
Hello, I am reading this paper about quantum gravity, trying and failing to follow along in the derivation of this, eq...
Dec4-11 05:01 PM
Rettaw
2 1,306
can earth revolve around the sun without rotating itself? why some planets revolve clockwise and some other...
Jan15-12 12:46 PM
Radrook
14 1,918
Is there any experimental proof for existence of dark energy and antigravity?
Jan12-12 01:19 AM
revelation101
3 1,077
I am a "fan" of science. I probably read a dozen or so popular science books a year, and I think I have a decent...
Jul14-06 03:49 PM
SpaceTiger
6 2,711
In the following video Penrose states that the Universe was so special and organized at its initial state the figure...
Mar15-11 10:43 PM
revo74
2 1,533
The word 'cosmos' is defined as an orderly harmonious systematic universe. There are some people who actually think...
Mar22-11 01:19 PM
Tanelorn
6 2,888
From my understanding there is no 'proof' that there is an 'outside the Universe'. My question is, does the latest...
Jun10-11 02:29 AM
DavidMcC
26 3,160
You often hear that it makes no sense to talk about time before the Big Bang because time itself did not exist,...
Nov9-11 05:31 AM
skydivephil
8 1,189
I am sure by now many of you have viewed the "A Universe from Nothing" lecture given by Lawrence Krauss on YouTube or...
Dec23-11 06:10 PM
apeiron
3 2,533
What percentage of stars become black holes? I tried to find this information through Google searching and the only...
Feb18-13 10:55 AM
Mordred
10 1,628
I've read a bit about "dark energy" to explain how the expansion of space can accelerate and overcome gravity's...
Jan13-13 01:20 PM
phinds
4 985
Two separate and independent means of observation have shown indications that the universe may have an axis of...
Apr17-07 06:02 PM
RGClark
0 1,225
In "The Trouble with Physics" by Lee Smolin, Chapter 10, page 167, in a discussion about "fitness landscapes" as they...
Feb21-10 02:12 PM
rhody
8 1,437
Daily Galaxy, July 2, 2010: Rhody... :surprised P.S. Is there really enough energy in the jets and nearby...
Jul5-10 04:46 PM
my_wan
8 1,485
Wow, what a Project: Square Kilometer Array This thread is unique, last one was written in 2007 concerning the...
Nov2-13 11:03 PM
Chalnoth
4 1,603
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 4,051
If the universe is infinite, does that mean that everything exists somewhere, besides obviously impossible things like...
Jul21-11 08:04 AM
Tanelorn
145 29,961
How will the future of the universe be if proton decay does not occur? Does it mean that the degenerate era will last...
Dec13-09 11:32 AM
emc2cracker
2 1,229
And as a consequence of this misnomer, most non-cosmologists continue to picture it as a big explosion. Though they...
Dec24-09 12:47 PM
marcus
4 2,803
Hello, My question is regarding the speed of the Big Bang explosion. As I understand it, within the first 10...
Dec9-11 04:52 PM
Drakkith
25 3,125
The universe’s clock has neither a start nor finish, yet time is finite according to a New Zealand theorist. The...
Dec15-07 09:30 PM
marcus
10 2,990
1. Is it possible that dark energy didnt originate from bigbang but from another that precedes the bigbang? 2. Are...
Oct11-10 06:18 AM
richerrich
7 998
I have it on good authority that the universe is rotating, and rotating about ALL its axes simultaneously and...
Apr17-11 12:24 AM
Imax
82 9,138
Im just curious as to what people think on this matter......is it really a possibility??? the more i read up on it the...
Jul5-13 10:42 PM
Simon Bridge
6 735
I found the following definition for the Hubble Radius: The radius of the Hubble sphere (Hubble radius) is defined...
Jun5-07 08:15 AM
hellfire
8 5,392
Is it true that if a luminous object is captured inside the cosmic horizon , then it stays in the horizon forever?...
Jun8-07 04:08 AM
Chronos
8 2,122
Hello everyone! Ok so from what I've read in various text books & wiki is that the red-shift of observed galaxies...
Sep9-09 11:55 AM
Riffraff
2 769
I have a question regarding the big crunch, maybe a bit stupid, butI'm breaking my head over it. So the universe is...
May20-10 01:41 AM
Chalnoth
22 3,380
When I first read about accelerated expansion in 1999 I immediatelly thought of gravitational repulsion between matter...
Dec6-06 08:54 AM
SpaceTiger
21 2,315
What do you think of this argument? Lets suppose an infinite and eternal universe that is homogenous on a large...
Sep5-13 04:56 PM
andrewkirk
16 1,116
What real proof is there of the Big Bang? I have never heard anything that is convincing. And how do scientists...
Jan11-09 10:35 AM
RiseAgainst
8 5,086
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 2,823
I am going to ask some questions based on my curiosity and my complete lack of knowledge and understanding of the...
Oct28-07 09:09 PM
Chris Hillman
3 2,431
Isaac Asimov, in his 1979 book A Choice of Catastrosphes: The Disasters That Threaten Our World, raised the...
Mar1-11 09:23 PM
Chronos
9 2,522
The orbits of the Magellanic Clouds about the Milky Way Galaxy have apparently been determined, and the two dwarf...
Mar16-07 10:34 PM
marcus
1 3,144
I have several questions concerning M87's jet: 1. From observations by the HST of the jet, its speed was...
Apr10-07 09:38 AM
Nereid
1 1,230
Why would gravitational waves be generated from the merging of two black holes or other types of mergers? What is...
May21-07 04:42 PM
Chris Hillman
3 1,600
Neil DeGrasse Tyson has written a book, Death by Black Hole and Other Cosmic Quandaries (2007, W.W. Norton), which by...
Sep10-07 12:47 AM
Chronos
2 1,415

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