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	<title>Comments on: Satellites collide in orbit</title>
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	<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/</link>
	<description>I am an astronomer, writer, and skeptic. I likes reality the way it is, and I aims to keep it that way. My real name is Phil Plait, and I run the Bad Astronomy blog.</description>
	<lastBuildDate>Tue, 24 Nov 2009 22:32:22 -0600</lastBuildDate>
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		<title>By: Os satélites e o lixo espacial: quais são as estatísticas? &#171; Eternos Aprendizes</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/comment-page-3/#comment-177866</link>
		<dc:creator>Os satélites e o lixo espacial: quais são as estatísticas? &#171; Eternos Aprendizes</dc:creator>
		<pubDate>Tue, 28 Apr 2009 14:43:47 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/#comment-177866</guid>
		<description>[...] Satellites collide in orbit [ Satélites colidem em órbita ] [...]</description>
		<content:encoded><![CDATA[<p>[...] Satellites collide in orbit [ Satélites colidem em órbita ] [...]</p>
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		<title>By: John</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/comment-page-3/#comment-160150</link>
		<dc:creator>John</dc:creator>
		<pubDate>Thu, 05 Mar 2009 01:50:37 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/#comment-160150</guid>
		<description>Is it feasible to sweep smaller junk into some sort of capture net?

http://techfox.comicgenesis.com/d/20041112.html</description>
		<content:encoded><![CDATA[<p>Is it feasible to sweep smaller junk into some sort of capture net?</p>
<p><a href="http://techfox.comicgenesis.com/d/20041112.html" rel="nofollow">http://techfox.comicgenesis.com/d/20041112.html</a></p>
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		<title>By: Robert</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/comment-page-3/#comment-159490</link>
		<dc:creator>Robert</dc:creator>
		<pubDate>Mon, 02 Mar 2009 00:31:19 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/#comment-159490</guid>
		<description>I&#039;d like to see our resident mathemeticians share a little bit more detail about their calculations and assumptions.

For instance, exactly how did you determine the percentage of kinetic energy that resuults in spacecraft damage?  What is your conversion rate of Joules to tons of TNT?  

(Please do all work in metric...along those lines, is tons of TNT a metric ton or a British ton?)

Thanks.  This just gets everyone on the same page and provides a nice physics primer for verybody.</description>
		<content:encoded><![CDATA[<p>I&#8217;d like to see our resident mathemeticians share a little bit more detail about their calculations and assumptions.</p>
<p>For instance, exactly how did you determine the percentage of kinetic energy that resuults in spacecraft damage?  What is your conversion rate of Joules to tons of TNT?  </p>
<p>(Please do all work in metric&#8230;along those lines, is tons of TNT a metric ton or a British ton?)</p>
<p>Thanks.  This just gets everyone on the same page and provides a nice physics primer for verybody.</p>
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		<title>By: Forget Iraq: Prepare for a &#8220;Space War&#8221;? — CitizenNext</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/comment-page-3/#comment-158295</link>
		<dc:creator>Forget Iraq: Prepare for a &#8220;Space War&#8221;? — CitizenNext</dc:creator>
		<pubDate>Wed, 25 Feb 2009 13:07:56 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/#comment-158295</guid>
		<description>[...] amount of force (two 700lb. objects, traveling towards each other at over 13,000 mph, apparently creates the impact energy of 5 tons of TNT)! The impact also created a huge cloud of shattered-satellite space debris about 500 miles large [...]</description>
		<content:encoded><![CDATA[<p>[...] amount of force (two 700lb. objects, traveling towards each other at over 13,000 mph, apparently creates the impact energy of 5 tons of TNT)! The impact also created a huge cloud of shattered-satellite space debris about 500 miles large [...]</p>
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		<title>By: Os satélites e o lixo espacial: quais são as estatísticas? &#171; Eternos Aprendizes</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/comment-page-3/#comment-156159</link>
		<dc:creator>Os satélites e o lixo espacial: quais são as estatísticas? &#171; Eternos Aprendizes</dc:creator>
		<pubDate>Sun, 15 Feb 2009 18:09:33 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/#comment-156159</guid>
		<description>[...] Satellites collide in orbit [...]</description>
		<content:encoded><![CDATA[<p>[...] Satellites collide in orbit [...]</p>
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		<title>By: cardoc</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/comment-page-3/#comment-155725</link>
		<dc:creator>cardoc</dc:creator>
		<pubDate>Fri, 13 Feb 2009 06:28:52 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/#comment-155725</guid>
		<description>I have to chime in on the 5 tons of TNT calculation.  Solving for the energy of an inelastic collision requires that you know the resultant vector (displacement AND rotational)  and mass (and polar moment) of every particle that leaves the point of the collision.  MOST of the kinetic energy of both birds was conserved because every fragment of them was still moving at near orbital velocity when following the event.

I imagine that the actual lines of motion were less than perfectly aligned.  The resulting &quot;glancing blow&quot; would cause both birds to leave the scene spinning very very rapidly which would cause them to rip apart into thousands of fragments.

Taking the total kinetic energy of both objects only works if they end up in a single mass and and then you still have to subtract the KE of the resultant blob.

There is no way to ever know how much energy was released.  One thing is for sure.  At those speeds on a crossing vector there was plenty of energy to destroy both birds.</description>
		<content:encoded><![CDATA[<p>I have to chime in on the 5 tons of TNT calculation.  Solving for the energy of an inelastic collision requires that you know the resultant vector (displacement AND rotational)  and mass (and polar moment) of every particle that leaves the point of the collision.  MOST of the kinetic energy of both birds was conserved because every fragment of them was still moving at near orbital velocity when following the event.</p>
<p>I imagine that the actual lines of motion were less than perfectly aligned.  The resulting &#8220;glancing blow&#8221; would cause both birds to leave the scene spinning very very rapidly which would cause them to rip apart into thousands of fragments.</p>
<p>Taking the total kinetic energy of both objects only works if they end up in a single mass and and then you still have to subtract the KE of the resultant blob.</p>
<p>There is no way to ever know how much energy was released.  One thing is for sure.  At those speeds on a crossing vector there was plenty of energy to destroy both birds.</p>
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		<title>By: StevoR</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/comment-page-3/#comment-155723</link>
		<dc:creator>StevoR</dc:creator>
		<pubDate>Fri, 13 Feb 2009 06:17:09 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/2009/02/11/satellites-collide-in-orbit/#comment-155723</guid>
		<description>Excessive jewish-Israeli influence on US foreign policy isn&#039;t &quot;conspiracy theory&quot; but fact. 

Nor am I not anti-jewish, just Pro-Palestinean! ;-)

Actually pro-Humanity when you think about it. Israel violates international law, basic human rights principles, committs endless war crimes and creates anti-semitism daily.  (&amp; not just anti-Palestinean and anti-Arab variety anti-semitism but anti-semitism directed, rather justifiably, against the perpetrators of so many war-crimes and crimes against humanity  - Israel &amp; the wider Israeli-Jewish lobby.)  

Ultimately, Israel will harm everybody incl. the Jews themselves. There is no better way to wipe out the jewish people, should you actually want to - &lt;b&gt;which I don&#039;t &lt;/b&gt; - than get them all together in one small piece of land then really, &amp; I mean really get the neighbours of that land to hate you. 

Israel will not remain militarily superior forever. One day it will lose its ability to terrorise its neighbours into submission - and will have the choice - learn to respect &amp; get on well with its neighbours - or perish.

It is hardly naive to think Mutally Assured Destruction works the USSR-USA Cold War &amp; the current India-Pakistan situation is proof of that. 

Mahmoud Ahmadinejhad is certainly no crazier than &quot;Dubya&quot; Bush and Iran too has a right to exist without fear of attack.

Why might I ask should Israel and USA, nations demonstrably more aggressive and with far worse records of respecting the rights of others have WMDs and yet not Iran? There is no answer for that question which is not blatant hypocrisy.

@ &lt;b&gt; Ragutis&lt;/b&gt; : (Feb 12th, 2009 at 2:58 am)
&lt;i&gt; StevoR, I don’t hesitate to criticize and condemn Israel for it’s criminal behavior against the Palestinians over the years, but you have got to be nuts to think that a nuclear Iran is a good idea. Nuclear weapons are a terrible idea in any circumstance, but imagining them in the hands of a theocracy is blood-chilling. &lt;/i&gt; 

Too late. Israel is a religio-racist apartheid military theocracy - &amp; it already has secret nukes in violation of UN law. The US was ruled until recently by a man (in the loosest sense of the word) who believes God told him to invade Iraq. I&#039;d prefer Iran had nukes than either of those nations -its record on the international stage is much more responsible and peaceful!;-)

(It is historical fact that Iran hasn&#039;t actually attacked any other 
nation since WWII - but rather been attackied by a few notably Iraq with
Amercian encouragement.)

&lt;b&gt; Ragutis&lt;/b&gt; continued :
&lt;i&gt; ... Yu want a quick solution? Get rid of that nutjob Ahmadinejad and overthrow the Supreme Leader. Iran has a huge youth population that are quite progressive and would really like to Westernize.&quot; &lt;/i&gt;

Sounds like the neo-cons plan for Iraq. Weren&#039;t we going to be greeted
with flowers and cheering crowds there? :-( 

No. Reigeme change just does NOT work. Accept it. Just because the US doesn&#039;t like some other govt does NOT give it the right to attack that nation. Its time this axiom was acknowledged and the US stopped itshysteria and started behaving more responsibly and multilaterally - hopefully Obama will the USA in that direction. 

&lt;i&gt;&quot;An aggressive U.S. and Israel only helps the reactionaries and clerics remain in power.&quot; &lt;/i&gt; 

Now on that we agree! :-) 

As for emoticons, well &lt;i&gt; I &lt;/i&gt; like &#039;em! ;-)

Oh &amp; the reason I was worried about my post coming though wasn&#039;t paranoia - I&#039;ve just had a few problems posting things on other threads here before. 
:-(</description>
		<content:encoded><![CDATA[<p>Excessive jewish-Israeli influence on US foreign policy isn&#8217;t &#8220;conspiracy theory&#8221; but fact. </p>
<p>Nor am I not anti-jewish, just Pro-Palestinean! <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
<p>Actually pro-Humanity when you think about it. Israel violates international law, basic human rights principles, committs endless war crimes and creates anti-semitism daily.  (&#038; not just anti-Palestinean and anti-Arab variety anti-semitism but anti-semitism directed, rather justifiably, against the perpetrators of so many war-crimes and crimes against humanity  &#8211; Israel &#038; the wider Israeli-Jewish lobby.)  </p>
<p>Ultimately, Israel will harm everybody incl. the Jews themselves. There is no better way to wipe out the jewish people, should you actually want to &#8211; <b>which I don&#8217;t </b> &#8211; than get them all together in one small piece of land then really, &#038; I mean really get the neighbours of that land to hate you. </p>
<p>Israel will not remain militarily superior forever. One day it will lose its ability to terrorise its neighbours into submission &#8211; and will have the choice &#8211; learn to respect &#038; get on well with its neighbours &#8211; or perish.</p>
<p>It is hardly naive to think Mutally Assured Destruction works the USSR-USA Cold War &#038; the current India-Pakistan situation is proof of that. </p>
<p>Mahmoud Ahmadinejhad is certainly no crazier than &#8220;Dubya&#8221; Bush and Iran too has a right to exist without fear of attack.</p>
<p>Why might I ask should Israel and USA, nations demonstrably more aggressive and with far worse records of respecting the rights of others have WMDs and yet not Iran? There is no answer for that question which is not blatant hypocrisy.</p>
<p>@ <b> Ragutis</b> : (Feb 12th, 2009 at 2:58 am)<br />
<i> StevoR, I don’t hesitate to criticize and condemn Israel for it’s criminal behavior against the Palestinians over the years, but you have got to be nuts to think that a nuclear Iran is a good idea. Nuclear weapons are a terrible idea in any circumstance, but imagining them in the hands of a theocracy is blood-chilling. </i> </p>
<p>Too late. Israel is a religio-racist apartheid military theocracy &#8211; &#038; it already has secret nukes in violation of UN law. The US was ruled until recently by a man (in the loosest sense of the word) who believes God told him to invade Iraq. I&#8217;d prefer Iran had nukes than either of those nations -its record on the international stage is much more responsible and peaceful!;-)</p>
<p>(It is historical fact that Iran hasn&#8217;t actually attacked any other<br />
nation since WWII &#8211; but rather been attackied by a few notably Iraq with<br />
Amercian encouragement.)</p>
<p><b> Ragutis</b> continued :<br />
<i> &#8230; Yu want a quick solution? Get rid of that nutjob Ahmadinejad and overthrow the Supreme Leader. Iran has a huge youth population that are quite progressive and would really like to Westernize.&#8221; </i></p>
<p>Sounds like the neo-cons plan for Iraq. Weren&#8217;t we going to be greeted<br />
with flowers and cheering crowds there? <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_sad.gif' alt=':-(' class='wp-smiley' />  </p>
<p>No. Reigeme change just does NOT work. Accept it. Just because the US doesn&#8217;t like some other govt does NOT give it the right to attack that nation. Its time this axiom was acknowledged and the US stopped itshysteria and started behaving more responsibly and multilaterally &#8211; hopefully Obama will the USA in that direction. </p>
<p><i>&#8220;An aggressive U.S. and Israel only helps the reactionaries and clerics remain in power.&#8221; </i> </p>
<p>Now on that we agree! <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' />  </p>
<p>As for emoticons, well <i> I </i> like &#8216;em! <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
<p>Oh &#038; the reason I was worried about my post coming though wasn&#8217;t paranoia &#8211; I&#8217;ve just had a few problems posting things on other threads here before.<br />
 <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_sad.gif' alt=':-(' class='wp-smiley' /> </p>
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