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	<title>Comments on: Asteroid 2012 DA14</title>
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	<lastBuildDate>Wed, 02 Oct 2013 00:42:00 +0000</lastBuildDate>
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		<title>By: Macscottcu</title>
		<link>http://www.calacademy.org/sciencetoday/asteroid-2012-da14/5510139/comment-page-1/#comment-1047</link>
		<dc:creator>Macscottcu</dc:creator>
		<pubDate>Fri, 01 Mar 2013 14:34:14 +0000</pubDate>
		<guid isPermaLink="false">http://www.calacademy.org/sciencetoday/?p=10139#comment-1047</guid>
		<description><![CDATA[&lt;p&gt;Asteroids, Natures&#039; target practice. :-)&lt;br&gt;Let me make an analogy (like all analogies, they are inconclusive, but I hope you find this helpful).&lt;/p&gt;

&lt;p&gt;Pretend the Earth is a TARGET.&lt;/p&gt;

&lt;p&gt;1. The outside ring of this target is worth 1 point (asteroid misses the earth but passes closer than the moon at its lowest point in it&#039;s orbit, but does not contact the atmosphere) 2. The next inside ring is worth 2 points (asteroid enters the Earth&#039;s atmosphere but does not impact the surface and is basically destroyed in the atmosphere)3. The next inside ring (rings are concentric) is worth 4 points (astroid impact is a &quot;striking blow,&quot; more that 90% of its mass is separated from it&#039;s core before impact and has a broad impact area)4. And finally the bulls-eye that is worth 10 points (asteroid is on a direct course to impact with a localized impact area, worst case)Now the question begging to be answered (at least by me) is &quot;what are the probabilities a particular ring is going to be hit if the trajectory of an asteroid is a random distributed on the target area (inside the moons orbit).Gut feeling, &quot;we were damn lucky on this last of Natures target practice.&quot;My rough guess with no calculations at all, just my gut feeling: 1=94%, 2=1%, 4= 2%, and finally a 10 point shot=3%Ready. set, Go Figure. :-) But first, make your own guess!!Scott Stokes&lt;br&gt;369 Orange Blossom Lane&lt;br&gt;San Rafael, CA 94903&lt;br&gt;macscottcu@me.com&lt;br&gt;Mobile: (415) 246-9156&lt;br&gt;&lt;/p&gt;]]></description>
		<content:encoded><![CDATA[<p>Asteroids, Natures&#39; target practice. <img src='http://www.calacademy.org/sciencetoday/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /> <br />Let me make an analogy (like all analogies, they are inconclusive, but I hope you find this helpful).</p>
<p>Pretend the Earth is a TARGET.</p>
<p>1. The outside ring of this target is worth 1 point (asteroid misses the earth but passes closer than the moon at its lowest point in it&#39;s orbit, but does not contact the atmosphere) 2. The next inside ring is worth 2 points (asteroid enters the Earth&#39;s atmosphere but does not impact the surface and is basically destroyed in the atmosphere)3. The next inside ring (rings are concentric) is worth 4 points (astroid impact is a &#8220;striking blow,&#8221; more that 90% of its mass is separated from it&#39;s core before impact and has a broad impact area)4. And finally the bulls-eye that is worth 10 points (asteroid is on a direct course to impact with a localized impact area, worst case)Now the question begging to be answered (at least by me) is &#8220;what are the probabilities a particular ring is going to be hit if the trajectory of an asteroid is a random distributed on the target area (inside the moons orbit).Gut feeling, &#8220;we were damn lucky on this last of Natures target practice.&#8221;My rough guess with no calculations at all, just my gut feeling: 1=94%, 2=1%, 4= 2%, and finally a 10 point shot=3%Ready. set, Go Figure. <img src='http://www.calacademy.org/sciencetoday/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' />  But first, make your own guess!!Scott Stokes<br />369 Orange Blossom Lane<br />San Rafael, CA 94903<br /><a href="mailto:macscottcu@me.com">macscottcu@me.com</a><br />Mobile: (415) 246-9156</p>
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		<title>By: Universe Update February &#171; Space &#171; Science Today: Breaking science news from around the world</title>
		<link>http://www.calacademy.org/sciencetoday/asteroid-2012-da14/5510139/comment-page-1/#comment-1037</link>
		<dc:creator>Universe Update February &#171; Space &#171; Science Today: Breaking science news from around the world</dc:creator>
		<pubDate>Wed, 27 Feb 2013 05:35:53 +0000</pubDate>
		<guid isPermaLink="false">http://www.calacademy.org/sciencetoday/?p=10139#comment-1037</guid>
		<description><![CDATA[[...] the arrival of the Russian meteor coincided with the flyby of Asteroid 2012 DA14, a small near-Earth object about 150 feet (45 meters) in diameter. As its name suggests, the [...]]]></description>
		<content:encoded><![CDATA[<p>[...] the arrival of the Russian meteor coincided with the flyby of Asteroid 2012 DA14, a small near-Earth object about 150 feet (45 meters) in diameter. As its name suggests, the [...]</p>
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	<item>
		<title>By: Meteorite Fragments &#8211; Russia &#171; Earth &#171; Science Today: Breaking science news from around the world</title>
		<link>http://www.calacademy.org/sciencetoday/asteroid-2012-da14/5510139/comment-page-1/#comment-1024</link>
		<dc:creator>Meteorite Fragments &#8211; Russia &#171; Earth &#171; Science Today: Breaking science news from around the world</dc:creator>
		<pubDate>Fri, 15 Feb 2013 15:43:40 +0000</pubDate>
		<guid isPermaLink="false">http://www.calacademy.org/sciencetoday/?p=10139#comment-1024</guid>
		<description><![CDATA[[...] Scientists believe there is no correlation to today&#8217;s flyby of Asteroid 2012 DA14. [...]]]></description>
		<content:encoded><![CDATA[<p>[...] Scientists believe there is no correlation to today&#8217;s flyby of Asteroid 2012 DA14. [...]</p>
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