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	<title>Comments on: &quot;Lighthouse&quot; Analogy No Longer Works for Pulsars</title>
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	<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/</link>
	<description>Space and astronomy news</description>
	<lastBuildDate>Sat, 21 Nov 2009 21:17:24 -0600</lastBuildDate>
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		<title>By: Ignoramus</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-50228</link>
		<dc:creator>Ignoramus</dc:creator>
		<pubDate>Fri, 16 Jan 2009 16:41:54 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-50228</guid>
		<description>If most of the Pulsars that we can see originate in the galaxy then indeed we will see them as mostly located around the &quot;equator&quot;
Thanks Sakib and Peter</description>
		<content:encoded><![CDATA[<p>If most of the Pulsars that we can see originate in the galaxy then indeed we will see them as mostly located around the &#034;equator&#034;<br />
Thanks Sakib and Peter</p>
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		<title>By: Sakib</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-49268</link>
		<dc:creator>Sakib</dc:creator>
		<pubDate>Fri, 09 Jan 2009 19:46:27 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-49268</guid>
		<description>@ ignoramus: Pulsars are produced from the death of massive stars. Massive stars only last for a short time. These stars are born in huge clouds of gas and dust, most of these clouds are situated in the inner parts of the Milky Way, most are between 1000 and 30 000 light years from us. The Milky Way is more or less 100 000 light years wide.</description>
		<content:encoded><![CDATA[<p>@ ignoramus: Pulsars are produced from the death of massive stars. Massive stars only last for a short time. These stars are born in huge clouds of gas and dust, most of these clouds are situated in the inner parts of the Milky Way, most are between 1000 and 30 000 light years from us. The Milky Way is more or less 100 000 light years wide.</p>
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		<title>By: Chris Coles</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48986</link>
		<dc:creator>Chris Coles</dc:creator>
		<pubDate>Thu, 08 Jan 2009 09:42:31 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48986</guid>
		<description>Trux,

You are assuming the planets stay in their normal orbits. What I am assuming is that the magnetic forces &quot;capture&quot; the iron core/s and attract and then entrain them in the magnetic field of the rotating star. In that case the core will increase its angular momentum and orbital velocity as it is attracted towards the star. If the magnetic field is strong enough, then the iron core may very well be at an orbit at the surface of the star.. The core in turn may well not retain its spherical shape, but, because this, perhaps, deformed iron mass, is orbiting around the star at its equator and at or near or even beneath the surface, it cannot become an integral constituent of the surface of the star simply because of the difference in surface speeds.

We may be observing a homogeneous mass magnetically influencing the surface of the star, but orbiting at or near the surface at speeds encompassing the effects we are observing. Multiple cores explaining the sometimes anomalous observations of cyclic variations in or observations.</description>
		<content:encoded><![CDATA[<p>Trux,</p>
<p>You are assuming the planets stay in their normal orbits. What I am assuming is that the magnetic forces &#034;capture&#034; the iron core/s and attract and then entrain them in the magnetic field of the rotating star. In that case the core will increase its angular momentum and orbital velocity as it is attracted towards the star. If the magnetic field is strong enough, then the iron core may very well be at an orbit at the surface of the star.. The core in turn may well not retain its spherical shape, but, because this, perhaps, deformed iron mass, is orbiting around the star at its equator and at or near or even beneath the surface, it cannot become an integral constituent of the surface of the star simply because of the difference in surface speeds.</p>
<p>We may be observing a homogeneous mass magnetically influencing the surface of the star, but orbiting at or near the surface at speeds encompassing the effects we are observing. Multiple cores explaining the sometimes anomalous observations of cyclic variations in or observations.</p>
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		<title>By: Peter</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48947</link>
		<dc:creator>Peter</dc:creator>
		<pubDate>Thu, 08 Jan 2009 03:00:13 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48947</guid>
		<description>To our ignoramous...
Who isn&#039;t one, if you are interested in the facts behind interesting articles and pics...
The &quot;horizon&quot; is the galactic disc, as seen from here on earth. Naturally, since we are talking stars and not vast systems like galaxies and clusters, we have to be concerned with those within our own. Others in other galaxies are just too far away unless they happen to go supernova. So since most stars in the Milky Way are toward the centre and either side thereof, that&#039;s where we find our pulsars.
Hope that makes sense! Keep questing!</description>
		<content:encoded><![CDATA[<p>To our ignoramous&#8230;<br />
Who isn&#039;t one, if you are interested in the facts behind interesting articles and pics&#8230;<br />
The &#034;horizon&#034; is the galactic disc, as seen from here on earth. Naturally, since we are talking stars and not vast systems like galaxies and clusters, we have to be concerned with those within our own. Others in other galaxies are just too far away unless they happen to go supernova. So since most stars in the Milky Way are toward the centre and either side thereof, that&#039;s where we find our pulsars.<br />
Hope that makes sense! Keep questing!</p>
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		<title>By: jerry</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48870</link>
		<dc:creator>jerry</dc:creator>
		<pubDate>Wed, 07 Jan 2009 18:14:20 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48870</guid>
		<description>The &#039;simple lighthouse model&#039; assumed a physical rotating energy source. What the new constraint requires is a pulse source that migrates in more than one plane, something you can&#039;t do with a solid body. 

This is not so much the &#039;mainstream&#039; being wrong, as new information ruling out a simple model.

As far as identifying the source... we still lack a full understanding of what is happening, and whether or not new physics is required to explain it.</description>
		<content:encoded><![CDATA[<p>The &#039;simple lighthouse model&#039; assumed a physical rotating energy source. What the new constraint requires is a pulse source that migrates in more than one plane, something you can&#039;t do with a solid body. </p>
<p>This is not so much the &#039;mainstream&#039; being wrong, as new information ruling out a simple model.</p>
<p>As far as identifying the source&#8230; we still lack a full understanding of what is happening, and whether or not new physics is required to explain it.</p>
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		<title>By: Ignoramus</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48848</link>
		<dc:creator>Ignoramus</dc:creator>
		<pubDate>Wed, 07 Jan 2009 14:50:56 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48848</guid>
		<description>Any reason why the &quot;equator&quot; in the picture above is the dominant location for Pulsars?</description>
		<content:encoded><![CDATA[<p>Any reason why the &#034;equator&#034; in the picture above is the dominant location for Pulsars?</p>
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		<title>By: trux</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48839</link>
		<dc:creator>trux</dc:creator>
		<pubDate>Wed, 07 Jan 2009 13:43:46 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48839</guid>
		<description>Planets do not seem to be a likely cause - they would have to be extremely close to the star and orbitting with speed close to the speed of light. Actually, the planets would have to be several magnitudes closer to the planet than their own diameter, which is impossible. At bigger distances they would already need to orbit with speeds bigger than the speed of light. 

The only possibility would be a perfectly regular chain of planets on the same orbit (a uniformly perforated ring), where the holes in the ring would cause the pulsing, but that&#039;s of course pure nonsense for many reasons.</description>
		<content:encoded><![CDATA[<p>Planets do not seem to be a likely cause &#8211; they would have to be extremely close to the star and orbitting with speed close to the speed of light. Actually, the planets would have to be several magnitudes closer to the planet than their own diameter, which is impossible. At bigger distances they would already need to orbit with speeds bigger than the speed of light. </p>
<p>The only possibility would be a perfectly regular chain of planets on the same orbit (a uniformly perforated ring), where the holes in the ring would cause the pulsing, but that&#039;s of course pure nonsense for many reasons.</p>
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		<title>By: Chris Coles</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48824</link>
		<dc:creator>Chris Coles</dc:creator>
		<pubDate>Wed, 07 Jan 2009 10:57:06 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48824</guid>
		<description>The assumption has been that the &quot;beam&quot; from a lighthouse is a straight line. But some very simple back of the envelope calculations will show that the rotation of such a beam, at astronomical distances, becomes by far the dominant feature. In that case it is surely possible to theorise that the beam will bend at its tip in the same way a whip trails behind the wrist action of the user? That the once straight beam becomes spread out behind the logical line of observation.

Secondly, if that is the case, may it also be the case that the rotational &quot;sideways&quot; movement, (energy), of the beam becomes the dominant feature of your observations?

Thirdly, turning to the actual object. Once simply a star, perhaps it also once had orbiting planets with Iron cores, and, that the magnetic forces during the formation of the pulsar, held the iron cores in orbit around the pulsar? In that case, those orbiting iron cores will inevitably have an interaction with the rotating magnetic field of the pulsar. And, in that case there may very well be another explanation for the rotating beam emanating from a pulsar....

Something for you all to think about.</description>
		<content:encoded><![CDATA[<p>The assumption has been that the &#034;beam&#034; from a lighthouse is a straight line. But some very simple back of the envelope calculations will show that the rotation of such a beam, at astronomical distances, becomes by far the dominant feature. In that case it is surely possible to theorise that the beam will bend at its tip in the same way a whip trails behind the wrist action of the user? That the once straight beam becomes spread out behind the logical line of observation.</p>
<p>Secondly, if that is the case, may it also be the case that the rotational &#034;sideways&#034; movement, (energy), of the beam becomes the dominant feature of your observations?</p>
<p>Thirdly, turning to the actual object. Once simply a star, perhaps it also once had orbiting planets with Iron cores, and, that the magnetic forces during the formation of the pulsar, held the iron cores in orbit around the pulsar? In that case, those orbiting iron cores will inevitably have an interaction with the rotating magnetic field of the pulsar. And, in that case there may very well be another explanation for the rotating beam emanating from a pulsar&#8230;.</p>
<p>Something for you all to think about.</p>
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		<title>By: Feenixx</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48822</link>
		<dc:creator>Feenixx</dc:creator>
		<pubDate>Wed, 07 Jan 2009 10:40:55 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48822</guid>
		<description>Pulsars have always fascinated me. They seem to be &quot;alive&quot;, in a way.
I really like the animation, for sheer visual impact, even if it meant nothing else. It&#039;s the beauty of Nature.... much like a time lapse movie of cells dividing, an embryo growing, or a flower opening and closing, revealing graceful motion of the intriguing hidden intricacies in Nature - but on a huge cosmic scale.
Thanks a lot for your heads-up on the conference!</description>
		<content:encoded><![CDATA[<p>Pulsars have always fascinated me. They seem to be &#034;alive&#034;, in a way.<br />
I really like the animation, for sheer visual impact, even if it meant nothing else. It&#039;s the beauty of Nature&#8230;. much like a time lapse movie of cells dividing, an embryo growing, or a flower opening and closing, revealing graceful motion of the intriguing hidden intricacies in Nature &#8211; but on a huge cosmic scale.<br />
Thanks a lot for your heads-up on the conference!</p>
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		<title>By: Astrofiend</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48751</link>
		<dc:creator>Astrofiend</dc:creator>
		<pubDate>Tue, 06 Jan 2009 23:29:42 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48751</guid>
		<description>Well, the good old lighthouse model was always going to be a bit oversimplified. Nice to see that some added observational firepower has led us a few steps closer to a more nuanced understanding of these fascinating objects...

Still, I&#039;d say the lighthouse model will be taught and demonstrated to undergrads for years to come yet!</description>
		<content:encoded><![CDATA[<p>Well, the good old lighthouse model was always going to be a bit oversimplified. Nice to see that some added observational firepower has led us a few steps closer to a more nuanced understanding of these fascinating objects&#8230;</p>
<p>Still, I&#039;d say the lighthouse model will be taught and demonstrated to undergrads for years to come yet!</p>
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		<title>By: Clayton</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48749</link>
		<dc:creator>Clayton</dc:creator>
		<pubDate>Tue, 06 Jan 2009 23:26:18 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48749</guid>
		<description>well, the &quot;Lighthouse&quot; analogy is *still better* than the notorious &quot;Outhouse&quot; analogy, and still better yet than the &quot;Little House on the Prairie&quot; analogy.

I am standing by the &quot;Fall of the House of Usher&quot; analogy which one day I think will be quite mainstream and accepted by all.

I&#039;m just sayin&#039;.</description>
		<content:encoded><![CDATA[<p>well, the &#034;Lighthouse&#034; analogy is *still better* than the notorious &#034;Outhouse&#034; analogy, and still better yet than the &#034;Little House on the Prairie&#034; analogy.</p>
<p>I am standing by the &#034;Fall of the House of Usher&#034; analogy which one day I think will be quite mainstream and accepted by all.</p>
<p>I&#039;m just sayin&#039;.</p>
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		<title>By: OilIsMastery</title>
		<link>http://www.universetoday.com/2009/01/06/lighthouse-analogy-no-longer-works-for-pulsars/comment-page-1/#comment-48743</link>
		<dc:creator>OilIsMastery</dc:creator>
		<pubDate>Tue, 06 Jan 2009 22:57:17 +0000</pubDate>
		<guid isPermaLink="false">http://www.universetoday.com/?p=23251#comment-48743</guid>
		<description>Excellent article Nancy.

Hopefully no one calls you a crackpot or crank for challenging mainstream mathematical views which are being challenged by discordant observations.

And hopefully you won&#039;t have to move to Germany like Halton Arp did.</description>
		<content:encoded><![CDATA[<p>Excellent article Nancy.</p>
<p>Hopefully no one calls you a crackpot or crank for challenging mainstream mathematical views which are being challenged by discordant observations.</p>
<p>And hopefully you won&#039;t have to move to Germany like Halton Arp did.</p>
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