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	<title>Comments on: Dusty Eye</title>
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	<link>http://asymptotia.com/2007/02/13/dusty-eye/</link>
	<description></description>
	<pubDate>Fri, 21 Nov 2008 05:45:21 +0000</pubDate>
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		<item>
		<title>By: ha</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-125389</link>
		<dc:creator>ha</dc:creator>
		<pubDate>Tue, 26 Aug 2008 07:21:03 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-125389</guid>
		<description>superb eye . i want to know whether it's sum kind of galaxy or wht is it ?</description>
		<content:encoded><![CDATA[<p>superb eye . i want to know whether it&#8217;s sum kind of galaxy or wht is it ?</p>
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		<title>By: vatsal</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-125130</link>
		<dc:creator>vatsal</dc:creator>
		<pubDate>Sat, 16 Aug 2008 16:50:05 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-125130</guid>
		<description>amazing really
i also want to go there with nasa</description>
		<content:encoded><![CDATA[<p>amazing really<br />
i also want to go there with nasa</p>
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		<title>By: Doug</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-28047</link>
		<dc:creator>Doug</dc:creator>
		<pubDate>Wed, 14 Feb 2007 17:52:23 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-28047</guid>
		<description>Why do the stars and planets have such an abundance of helical trajectories?

Could dynamic noncooperative game theorists such as Tamer Basar and Geert Jan Olsder, SIAM classic, 'Dynamic Noncooperative Game Theory' be correct in their use of pursuit-evasion games with cylindical trajectory space [chapter 8]?</description>
		<content:encoded><![CDATA[<p>Why do the stars and planets have such an abundance of helical trajectories?</p>
<p>Could dynamic noncooperative game theorists such as Tamer Basar and Geert Jan Olsder, SIAM classic, &#8216;Dynamic Noncooperative Game Theory&#8217; be correct in their use of pursuit-evasion games with cylindical trajectory space [chapter 8]?</p>
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		<title>By: astromcnaught</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-28008</link>
		<dc:creator>astromcnaught</dc:creator>
		<pubDate>Wed, 14 Feb 2007 10:56:04 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-28008</guid>
		<description>Amazing image...

I do believe that the spikes are doubled, so from the stars in the image one can see that the Spitzer telescope has 3 vanes.  

Yes. Here's a picture: http://www.spitzer.caltech.edu/technology/telescope.shtml

The vanes do not come from the side of the tube as in a normal earth-based instrument but are part of a stucture holding the secondary that is stuck to the middle of the main mirror.</description>
		<content:encoded><![CDATA[<p>Amazing image&#8230;</p>
<p>I do believe that the spikes are doubled, so from the stars in the image one can see that the Spitzer telescope has 3 vanes.  </p>
<p>Yes. Here&#8217;s a picture: <a href="http://www.spitzer.caltech.edu/technology/telescope.shtml" rel="nofollow">http://www.spitzer.caltech.edu/technology/telescope.shtml</a></p>
<p>The vanes do not come from the side of the tube as in a normal earth-based instrument but are part of a stucture holding the secondary that is stuck to the middle of the main mirror.</p>
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		<title>By: Navneeth</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27992</link>
		<dc:creator>Navneeth</dc:creator>
		<pubDate>Wed, 14 Feb 2007 06:20:52 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27992</guid>
		<description>&lt;i&gt;&lt;b&gt;Bee&lt;/b&gt;: "Do I understand that correctly that the number of spikes comes from the â€™spider vanesâ€™ of the secondary mirror?"&lt;/i&gt;

With reflectors that's usually the case, but I've seen pictures in which some twine/thread was used across the objective of a refractor to create "artificial" spikes.</description>
		<content:encoded><![CDATA[<p><i><b>Bee</b>: &#8220;Do I understand that correctly that the number of spikes comes from the â€™spider vanesâ€™ of the secondary mirror?&#8221;</i></p>
<p>With reflectors that&#8217;s usually the case, but I&#8217;ve seen pictures in which some twine/thread was used across the objective of a refractor to create &#8220;artificial&#8221; spikes.</p>
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		<title>By: Bee</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27952</link>
		<dc:creator>Bee</dc:creator>
		<pubDate>Tue, 13 Feb 2007 21:03:11 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27952</guid>
		<description>Hi There,

Thanks! Cool, I googled for diffraction spikes and have learned something :-) Do I understand that correctly that the number of spikes comes from the 'spider vanes' of the secondary mirror? I actually quite like them. 

Best,

B.</description>
		<content:encoded><![CDATA[<p>Hi There,</p>
<p>Thanks! Cool, I googled for diffraction spikes and have learned something <img src='http://asymptotia.com/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /> Do I understand that correctly that the number of spikes comes from the &#8217;spider vanes&#8217; of the secondary mirror? I actually quite like them. </p>
<p>Best,</p>
<p>B.</p>
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	<item>
		<title>By: Clifford</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27944</link>
		<dc:creator>Clifford</dc:creator>
		<pubDate>Tue, 13 Feb 2007 20:26:10 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27944</guid>
		<description>Yes, that jumped out at me immediately, but I said to myself "What do I know? They're the astronomers...". More to be done here, evidently.


Cheers,

-cvj</description>
		<content:encoded><![CDATA[<p>Yes, that jumped out at me immediately, but I said to myself &#8220;What do I know? They&#8217;re the astronomers&#8230;&#8221;. More to be done here, evidently.</p>
<p>Cheers,</p>
<p>-cvj</p>
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		<title>By: Amara</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27939</link>
		<dc:creator>Amara</dc:creator>
		<pubDate>Tue, 13 Feb 2007 20:10:12 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27939</guid>
		<description>Their explanation of the extra dust is 'comets smashing into each other at the edge of the white dwarf system'. What a peculiar explanation. How often have you heard of comets colliding in our solar system?  You don't because their diameters are small and their number density is too low. I wonder why they don't think that the usual comet behavior of heating up and sublimating its gas and dust is not a suitable process of generating dust for this system?

If they have the resolution, and if I were them, I would look for warps and resonance patterns in the dust as indicators of what larger bodies might be hidden underneath. A dead planet is still a planet, and could teach us something useful about the end or our own solar system.

Greetings from Nice, Amara</description>
		<content:encoded><![CDATA[<p>Their explanation of the extra dust is &#8216;comets smashing into each other at the edge of the white dwarf system&#8217;. What a peculiar explanation. How often have you heard of comets colliding in our solar system?  You don&#8217;t because their diameters are small and their number density is too low. I wonder why they don&#8217;t think that the usual comet behavior of heating up and sublimating its gas and dust is not a suitable process of generating dust for this system?</p>
<p>If they have the resolution, and if I were them, I would look for warps and resonance patterns in the dust as indicators of what larger bodies might be hidden underneath. A dead planet is still a planet, and could teach us something useful about the end or our own solar system.</p>
<p>Greetings from Nice, Amara</p>
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	<item>
		<title>By: Clifford</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27938</link>
		<dc:creator>Clifford</dc:creator>
		<pubDate>Tue, 13 Feb 2007 20:08:34 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27938</guid>
		<description>Navneeth, you're absolutely right.... I was thinking about this while giving the class I ran off to give just after hitting "publish". Modified. Thanks. Moral: never post in haste..... Thanks for the link too...

-cvj</description>
		<content:encoded><![CDATA[<p>Navneeth, you&#8217;re absolutely right&#8230;. I was thinking about this while giving the class I ran off to give just after hitting &#8220;publish&#8221;. Modified. Thanks. Moral: never post in haste&#8230;.. Thanks for the link too&#8230;</p>
<p>-cvj</p>
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	<item>
		<title>By: Navneeth</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27926</link>
		<dc:creator>Navneeth</dc:creator>
		<pubDate>Tue, 13 Feb 2007 19:34:50 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27926</guid>
		<description>Bee, those are diffraction spikes. I'm not sure if it's due to the telescope or image processing, but I've seen some amateur astrophotographers play with those spikes (number, length, etc.) to make the image look more beautiful.</description>
		<content:encoded><![CDATA[<p>Bee, those are diffraction spikes. I&#8217;m not sure if it&#8217;s due to the telescope or image processing, but I&#8217;ve seen some amateur astrophotographers play with those spikes (number, length, etc.) to make the image look more beautiful.</p>
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	<item>
		<title>By: Navneeth</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27925</link>
		<dc:creator>Navneeth</dc:creator>
		<pubDate>Tue, 13 Feb 2007 19:30:52 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27925</guid>
		<description>Clifford, this nebula is not a supernova remnant. It's a planetary nebula, which is usually the "end-stage" of a sun-like star, after the red-giant phase. [Too many hyphenated words!]
http://antwrp.gsfc.nasa.gov/apod/ap041229.html</description>
		<content:encoded><![CDATA[<p>Clifford, this nebula is not a supernova remnant. It&#8217;s a planetary nebula, which is usually the &#8220;end-stage&#8221; of a sun-like star, after the red-giant phase. [Too many hyphenated words!]<br />
<a href="http://antwrp.gsfc.nasa.gov/apod/ap041229.html" rel="nofollow">http://antwrp.gsfc.nasa.gov/apod/ap041229.html</a></p>
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	<item>
		<title>By: Bee</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27921</link>
		<dc:creator>Bee</dc:creator>
		<pubDate>Tue, 13 Feb 2007 18:56:16 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27921</guid>
		<description>beautiful! I've a really stupid question (no, really) these bright large stars in the periphery which spread out into the typical star-shape - why does that occur in a hexagon? It that an artifact of the imaging process?</description>
		<content:encoded><![CDATA[<p>beautiful! I&#8217;ve a really stupid question (no, really) these bright large stars in the periphery which spread out into the typical star-shape - why does that occur in a hexagon? It that an artifact of the imaging process?</p>
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		<title>By: Anon</title>
		<link>http://asymptotia.com/2007/02/13/dusty-eye/#comment-27920</link>
		<dc:creator>Anon</dc:creator>
		<pubDate>Tue, 13 Feb 2007 18:51:48 +0000</pubDate>
		<guid isPermaLink="false">http://asymptotia.com/2007/02/13/dusty-eye/#comment-27920</guid>
		<description>That is AMAZING...</description>
		<content:encoded><![CDATA[<p>That is AMAZING&#8230;</p>
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