Comments on: Mostly Empty Space http://www.starstryder.com/2007/08/23/mostly-empty-space/ Blogging one sidereal day at a time Tue, 16 Mar 2010 18:28:04 -0400 http://wordpress.org/?v=2.8.6 hourly 1 By: Star Stryder » Blog Archive » 1 Void a 2nd Universe Makes?- by Pamela L. Gay http://www.starstryder.com/2007/08/23/mostly-empty-space/comment-page-1/#comment-17575 Star Stryder » Blog Archive » 1 Void a 2nd Universe Makes?- by Pamela L. Gay Wed, 28 Nov 2007 05:54:30 +0000 http://www.starstryder.com/2007/08/23/mostly-empty-space/#comment-17575 [...] indicate that we might have found that proof in the from of a giant void. (I talked about the void here). The proof? Well, I couldn’t find a peer reviewed journal article or any related science [...] [...] indicate that we might have found that proof in the from of a giant void. (I talked about the void here). The proof? Well, I couldn’t find a peer reviewed journal article or any related science [...]

]]> By: Space Sheepz » How to find the biggest hole in the Universe http://www.starstryder.com/2007/08/23/mostly-empty-space/comment-page-1/#comment-14184 Space Sheepz » How to find the biggest hole in the Universe Sat, 10 Nov 2007 17:49:04 +0000 http://www.starstryder.com/2007/08/23/mostly-empty-space/#comment-14184 [...] read more | digg story [...] [...] read more | digg story [...]

]]> By: Roger PB http://www.starstryder.com/2007/08/23/mostly-empty-space/comment-page-1/#comment-10285 Roger PB Mon, 08 Oct 2007 07:04:26 +0000 http://www.starstryder.com/2007/08/23/mostly-empty-space/#comment-10285 I have read one report that the "hole" in Eridanus is a billion light years across, and another that it is a billion light years in diameter. Which is correct? Is there any estimate of its volume, i.e. considering three dimensions, if this is possible? How big is its volume compared with that of our galaxy, which I understand is about 100,000 light years in diameter, and max. 7000 thick at its centre? I have read one report that the “hole” in Eridanus is a billion light years across, and another that it is a billion light years in diameter. Which is correct? Is there any estimate of its volume, i.e. considering three dimensions, if this is possible?

How big is its volume compared with that of our galaxy, which I understand is about 100,000 light years in diameter, and max. 7000 thick at its centre?

]]> By: AstroGeek Big Hole « http://www.starstryder.com/2007/08/23/mostly-empty-space/comment-page-1/#comment-6855 AstroGeek Big Hole « Fri, 24 Aug 2007 20:25:29 +0000 http://www.starstryder.com/2007/08/23/mostly-empty-space/#comment-6855 [...] fact they found a whole lot of nothing.   Wired news has a write-up on it, as does StarStryder and the National Radio Astronomy Observatory (which operates the VLA).   It’s [...] [...] fact they found a whole lot of nothing.   Wired news has a write-up on it, as does StarStryder and the National Radio Astronomy Observatory (which operates the VLA).   It’s [...]

]]> By: Ethan Siegel http://www.starstryder.com/2007/08/23/mostly-empty-space/comment-page-1/#comment-6833 Ethan Siegel Fri, 24 Aug 2007 14:05:57 +0000 http://www.starstryder.com/2007/08/23/mostly-empty-space/#comment-6833 One important thing to remember is how this all works -- we see cold spots when we have structure that's growing, and hot spots when a void is growing. (That's what the ISW effect is.) Is there a correlation on the sky between the NVSS catalogue and this one very cold spot? Yes. Is one the cause of the other? That's the possibility these authors raise, but in my opinion they overstate their case; it's possible, but there's no reason, at this point, to think that the lack of galaxies is causing the temperature cold spot. One important thing to remember is how this all works — we see cold spots when we have structure that’s growing, and hot spots when a void is growing. (That’s what the ISW effect is.)

Is there a correlation on the sky between the NVSS catalogue and this one very cold spot? Yes.

Is one the cause of the other? That’s the possibility these authors raise, but in my opinion they overstate their case; it’s possible, but there’s no reason, at this point, to think that the lack of galaxies is causing the temperature cold spot.

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