Sub-Forums : Cosmology Search this Forum

### Cosmology FAQ

Quality answers to common cosmology questions
Jun25-11 09:50 PM bcrowell

# Cosmology

- The origin, evolution, structure and eventual fate of the universe.
 Views: 717 Announcement: End of year contest, $75+$50 prize! Dec18-13 Meta Thread / Thread Starter Last Post Replies Views Pinned: Effort to get us all on the same page (balloon analogy) ( 1 2 3 ... Last) To have an enjoyable cosmo forum we needed a balance between mental freedom on the one hand and a shared knowledge... Sep12-13 02:51 PM GeorgeDishman 474 115,483 The new A20 tabular calculator lets you look at changing geometry out to about 88 billion years according to the... May19-13 12:45 PM Jorrie 56 17,834 Can BH be formed during star formation process? For instance, giant gas cloud or several collided clouds. In this... Jan17-09 11:38 AM Sriram.S 15 5,249 Is it possible to know BH age? Dec13-08 07:38 AM Sundance 2 3,671 In this present world we can see that many objects grow branches itself for growth .For example, 1.trees grow in size... Sep8-13 04:39 PM Mordred 3 461 I have read a few posts and threads in here regarding the orgin of the Univers and also the big bang (BB). Some of... Feb16-12 03:54 PM Spourk 12 1,266 Hi, my astronomy teacher want's us to give him some possibilities as to why supermassive black holes cannot form by... Jan31-08 11:00 PM pseudo 8 2,076 Gravitation is described on one hand as curvature of space in the presence of matter. It is also described as a field... Jul5-13 04:53 PM Mordred 6 598 I am just wondering about the big bang theory. If galaxies are travelling away from us at great speeds, what about the... Dec23-05 06:47 AM mars2 4 2,580 Just found this article...thought you guys may want to check it out. ... Jan13-09 02:24 AM gtring 9 1,238 It is moving, accelerating or stationary? PS: hi, I am noob say hi to the new comers. Nov30-07 01:58 AM zankaon 26 6,247 Hello all, I'm new and this is my first post here, I don't expect my idea to be plausible because I'm more of a... Oct5-10 03:50 AM cristo 5 1,363 I am not a scientist. Just a normal 52 year old. One question I have is - If there was a Big Bang,there has to be a... Aug2-10 02:02 PM Naty1 4 1,487 I just read the thread on inflation is very unlikely. Then I read the paper by Abhay Ashtekar, David Sloan Loop... Jul24-10 04:58 PM rwmp 2 810 Does it make sense to visualize dark matter as roughly spherical, or oblate, around a spiral galaxy? Perhaps... Sep30-11 03:08 AM Chalnoth 2 1,215 Before i begin, i will note that i truly don't have any idea of what i'm about to ask, but the questions elude me so... Aug28-12 06:10 PM Drakkith 13 1,178 I wondered about them sometime; I came across many theories, such as it might be because the of the black hole at its... Nov4-13 04:37 PM Nugatory 8 776 I guess the question is: Is the often used spherical symmetry of the universe just an assumption or is there evidence... Jul6-09 04:26 PM marcus 8 1,078 This has likely been asked before but my attempts at searches did not yield what I was looking for. Assuming the... Jul19-09 11:09 PM FunkyDwarf 31 2,012 'Birth of gravity' is a lead in question to an area I fully admit ahead of time I know little. What I'm wanting to... Aug7-09 06:50 AM cristo 42 2,681 Only comment on this is that most of this is correct WITHIN the current model used for the cosmological redshift. ... Sep16-09 05:50 PM ViewsofMars 41 2,967 Now, assuming the big bang theory is true, how can we explain how that first tiny particle got there? If that small... Nov2-09 06:52 PM S.Vasojevic 45 3,716 Hi all, I'm hoping someone can help me out as I'm really stuck. With reference to the top of page 7 at... Oct4-06 03:52 PM S.P.P 4 4,804 I'd like to compare some models of mine against results from WMAP. Is there anywhere I can get the data, l(l+1) Cl /... Feb12-09 04:06 PM Chalnoth 3 1,735 If geometry of spacetime is flat in intergalactic medium (empty space), why then there is no point of asking where is... Sep27-09 08:41 AM jolted 3 1,539 I am starting this thread because this is something Sylas and me were discussing off topic on another thread, but I... Oct8-09 03:13 AM Chalnoth 31 2,513 If we take some super telescope and go to the North pole, point it straight up, observe some distant galaxy, measure... Oct22-09 12:07 PM Chalnoth 27 2,320 I know that our solar system and sun evolved from a nebula of a giant star.. but what happened to the remaining of the... Mar21-13 10:32 AM Bandersnatch 1 554 Ok so first I know that this equation was presented by Stephen Hawking to describe to Temperature of a black hole: ... Dec13-11 11:21 AM sabanation12 6 2,154 More i found this article interesting , so shared here Nov16-10 01:41 AM granpa 1 869 The age of the universe is equated to the age of the oldest objects in it - and estimated at about 13.75 billion... Oct23-11 11:49 PM Imax 22 2,636 As the universe expanded after the big bang it was expanding into nothingness, ie even the fabric of space-time itself... Oct17-11 05:36 PM Chalnoth 37 3,986 we say the universe around us is isotropic and homogeneous. it means that all direction and points are the same for... Oct8-12 10:09 AM Chalnoth 3 871 I'm researching the creation of galaxies and I've came across these two terms. In my research on theory says that the... Dec19-11 12:58 AM Chronos 2 1,169 what is heat death of universe?????????????????? Jan29-08 08:59 PM Wallace 8 1,985 z x c = H x d is the formula I am using to try to convert redshift to megaparsecs, where H I'm taking to be 71km/s/Mpc... Dec23-11 05:47 PM zhermes 2 2,258 Is the earth moving away from the moon (however tiny amount it may be) due to expansion of the universe? Or is... Sep5-12 01:45 AM bcrowell 19 3,064 What is the basis for the theory that WIMPs could be detected by seeing a vibration in the atomic nucleus of normal... Jan18-12 09:14 PM phinds 6 923 I have a few questions that I'd love to have someone with specific knowledge of the field to answer. Forgive my... Nov13-09 04:21 PM Saint Brian 24 1,817 I have been watching Susskind's lectures on Cosmology which are great. There is something that I can't wrap my head... May16-13 09:57 PM marcus 4 622 I've always wondered, have scientists been able to find the center of the Universe? I don't mean of just the... Aug17-09 04:57 PM DrChinese 11 1,330 I am not an expert on this matter but it got really interested in the physics of the expanding universe, I believe... Apr20-06 04:12 PM loopgrav 21 3,049