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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
483 125,432
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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Hi , I need help from someone who has worked out the distance duality relation (between angular diameter distance...
Dec25-10 08:57 AM
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Gravity is an important force in this world. if we presume humans have evolved over millions of years through a...
Dec23-10 10:11 PM
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Interesting article in Newscientists, thought I'd start a discussion... ...
Dec23-10 04:40 PM
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Suppose two massive bodies are far enough apart that the expansion of space precisely counteracts their gravitational...
Dec23-10 08:34 AM
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Causing people to start walking backwards, uneating, undrinking, undoing everything they've ever done.
Dec22-10 10:24 PM
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How does dark flow work? Thanks
Dec22-10 01:57 AM
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Good day All, Our current understanding of time is that it is not linear or constant; just add gravity. I've...
Dec22-10 01:56 AM
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I am asking for a sort of "artists rendition" of what the universe looked like from the Big Bang onward -- what our...
Dec22-10 12:47 AM
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Ive been viewing for years but never posted. I am curious since I use a telescope a lot whether anyone knows if...
Dec21-10 12:17 PM
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Disclaimer: I am a science buff – not a scientist. I am curious to know if there has ever been a theory developed...
Dec21-10 02:55 AM
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Contributers to this forum are no lovers of popular science magazines or TV. programs, but this is from where most...
Dec20-10 07:58 PM
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If a spherical mirror was constructed large enough to hold a human with, lets say 20 feet all round, and assuming once...
Dec20-10 06:18 PM
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Is cosmic expansion nothing more than compliance with Heisenberg Indeterminacy? The edge of the Universe presents a...
Dec19-10 05:57 PM
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I guess dark matter is the most abundant matter. But which contributes next to the most, intersteller dust or suns?
Dec19-10 04:24 PM
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Thought I'd share a thought I had about a year or so ago while I was looking through a Hubble photos book in...
Dec19-10 09:07 AM
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How much will the planck mission resolve about the universe.
Dec18-10 01:17 PM
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A little philosophical question. What would you say is the purpose of a black hole? To create another universe? To...
Dec18-10 07:25 AM
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Photons were trapped within the early stages of the expanding Universe. When the early universe expanded to a...
Dec17-10 01:46 PM
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I was wondering if it were in actuality possible to assume the universe was created from a big bang, as it seems we...
Dec17-10 04:48 AM
sri sharan
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Hey, I was just thinking and wondering if beyond the boundaries of our universe, (if there were boundaries) if it...
Dec16-10 01:10 PM
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Greetings, PF community. I have a very simple question regarding the Big Crunch theory. As far as I know, the Big...
Dec16-10 10:14 AM
36 3,062 First Observational Tests of Eternal Inflation Stephen M. Feeney (UCL), Matthew C....
Dec14-10 11:19 AM
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What would a cosmological model without dark matter and dark energy look like? This requires imagining that the...
Dec12-10 06:11 PM
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Penrose and Gurzadyan are not giving up without a fight. They posted a second paper today, answering their critics: ...
Dec11-10 06:23 PM
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Please note that I am not trying to forward any type of personal theory. I am only trying to understand generally...
Dec11-10 07:04 AM
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I'm ignorant, so please excuse me. I've read time and time again over the years on the topic of "the universe" and...
Dec8-10 11:08 PM
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The evidence points to an expanding universe, we tell this by looking at the redshift/distance relationship, objects...
Dec8-10 07:29 AM
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Just read an article on Universe Today at: The...
Dec8-10 03:21 AM
7 1,946 These papers seem to claim that the circles found...
Dec7-10 08:13 PM
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Here's some strange stuff coming from Penrose... An article on Universe Today:...
Dec7-10 02:29 PM
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Hi, these days. im reading a lot about dark matter and energy in news papers. i came to know that dark...
Dec6-10 01:21 PM
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I would just like to ask a very elegant question. What is the shape of the universe?
Dec6-10 08:30 AM
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Does anyone have a recommendation for a paper/source for data relating distance modulus and redshift data over a large...
Dec3-10 10:11 PM
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If the universe is filled with matter, and that matter causes space-time to bend, wouldn't the over-all structure be...
Dec3-10 04:06 PM
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Can you tell me the role of electromagnetic radiation in cosmology today? 1. how much energy is in the form of...
Dec3-10 03:32 PM
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this is a piece of star's picture that was taken with using Optical Vortex Coronagraph by university arizona in 2006...
Dec3-10 02:45 AM
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I just noticed an item in Ned Wright's "News of the Universe" about a new determination of the solar system's speed. ...
Dec1-10 12:27 PM
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Guys please help me with an answer to this question. Which substances can cosmic rays penetrate? I mean, can the...
Dec1-10 08:30 AM
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I am just a layman who read that the farthest quasars (based on redshift) are about 13 billion light years away. Is...
Nov30-10 05:17 PM
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I was reading about cosmology on Wikipedia (as I am wont to do) and have a question regarding the farthest galaxies we...
Nov30-10 03:28 PM
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