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

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- 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
483 125,334
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
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Stephen Hawking gave me a clear timeline of the universe, from the expansion of the singularity to its current (and...
Sep5-11 03:17 PM
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Hello first time to this forum ^^,It is awesome very good work, So i was wondering if there was a topic about...
Sep5-11 01:35 PM
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I recently watched Stephen Hawking on Discovery's "Curiosity" and found his assertion that a grand designer could not...
Sep5-11 03:45 AM
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If the acceleration of the expansion of the universe is driven by the vaccuum energy 'created' by newly-formed space,...
Sep3-11 11:00 PM
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After the big bang, did the cosmic inflation of space occur as a gravitational wave?
Sep2-11 02:07 PM
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(Maybe this should go under General Math or maybe even Topology but since it's about the dimension of the universe...
Sep2-11 08:31 AM
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I know that the rubbersheet / fabric analogies that we see on TV and in various diagrams are only a metaphor, but I'm...
Sep1-11 04:41 AM
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I recently watched curiosity and i have been having a hard time grasping how it describes the creation of our...
Aug31-11 07:24 AM
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The process in which the nucleus and electrons combined to form neutral atoms at early times is called recombination....
Aug31-11 02:12 AM
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I was just reading on wikipedia about the expansion of space. (
Aug29-11 08:36 PM
6 1,472 Results from the Large Hadron Collider (LHC) have all but...
Aug27-11 03:12 PM
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I was watching Brian Cox on TV last night and he was talking about the heat death of the universe and made the...
Aug27-11 06:16 AM
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Right after the big bang a gas consisting of many elementary particles, including neutrinos and antineutrinos was...
Aug27-11 03:30 AM
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How can we see light from 400K years after the big bang? Are we older than this light? Did we travel faster than this...
Aug27-11 12:57 AM
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I've read that the universe is Euclidean and have also read that space is bent by gravity. Descriptions of geometry...
Aug26-11 11:37 AM
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In a reply to a correspondents question, it was stated that the expansion rate of the universe is slowing. This would...
Aug25-11 08:18 PM
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According to John Baez, Einstein's Field equations can be written in the following form: V'' / V = - 1/2 (rho +...
Aug25-11 04:22 PM
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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
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Hi everybody!! I'm going to make this quick, so i won't waste your time! SO: What are the proofs of the expansion of...
Aug23-11 11:30 PM
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I know the constant ΛCDM model predicts the expansion factor a (= 1/ providing we impose the condition a = 1 now) to...
Aug23-11 02:19 AM
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When cosmologists talk about "late times" do they mean post-recombination and pre-Lambda domination or what?
Aug22-11 10:00 PM
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Consider the uncertainty principle: dp * dx = hbar For photons we have the relation: E = p c Substituting...
Aug22-11 03:45 AM
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Hello! I'm assuming the model of the Big Bang Theory and I'm asking specifically about the 'moment' of creation;...
Aug20-11 09:03 AM
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Hi everybody, I was wondering this: "What is the probability, given all the information (including scientific...
Aug19-11 02:31 PM
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If virtual particles were prevented from annihilating fractions of a second before the Big Rip itself is actually...
Aug18-11 07:14 PM
Edward Solomo
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I am a layman in these matters, but hear me out... The Universe was ejected from the primordial singularity, and...
Aug18-11 05:52 PM
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Before the Big Crunch, Big Rip, Heat Death or Big Freeze happens?
Aug18-11 04:00 PM
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Does the current model of cosmology treat the universe as an isolated system?
Aug18-11 03:39 PM
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Is my understaning correct that we don't know the size of the universe? Am I correct that it is not 26'ish billion...
Aug18-11 02:01 PM
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The model I have is very simple it is: a(t) = A * (exp(H t) - 1) where H^2 = (8 Pi G /3 ) rho_min and A...
Aug18-11 03:30 AM
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I've been looking all over the internet for an answer to this question, and I am yet to find one, so I've decided I'll...
Aug17-11 02:03 PM
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Just curious as to what you think about this recent paper from Max Tegmark: How unitary cosmology generalizes...
Aug17-11 10:57 AM
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I am interested in peoples opinion on the following papers, hep-th/0307026 Inflation and de Sitter holography...
Aug17-11 06:51 AM
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I'm assuming that the observer witnesses all other particles enter a horizon, be it an event horizon or the particle...
Aug17-11 02:42 AM
Edward Solomo
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Would it be possible to observe our own Milky Way Galaxy developing in its early stages? Or at least possible for a...
Aug15-11 09:50 PM
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Helder Velez brought the following paper to my attention: Carnero et al., "Clustering of Photometric Luminous Red...
Aug14-11 07:18 PM
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As far as I am aware of the current and accepted theory regarding the size and structure of the universe, based on...
Aug14-11 02:03 PM
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Since the second law of thermodynamics builds upon the first, if the first law doesn't apply to cosmology like it...
Aug14-11 09:51 AM
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Hi there! I'm new here and am currently looking into the Hartle-Hawking and Hawking-Turok Quantum creation models. ...
Aug14-11 02:17 AM
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Since light emitted farther away from our point in the universe is more and more red shifted, would this mean that at...
Aug13-11 08:35 PM
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