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	<title>Comments on: Retcon artist</title>
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	<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/</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>
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		<title>By: Philip Kahn</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-336030</link>
		<dc:creator>Philip Kahn</dc:creator>
		<pubDate>Fri, 26 Nov 2010 07:34:55 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-336030</guid>
		<description>Really, just going to warp should have worked on several levels. Most notably the fact that the warp field reduces the &quot;visible&quot; or &quot;apparent&quot; mass of the starship to zero allowing the whole faster-than-light thing to happen (Remember that episode when Q was made human, and he told Geordi to change the gravitational constant? All they had to do was throw a warp field around it).

Unless they were too close in for Warp 6ish to kick them out of the event horizon. But they&#039;d have to be pretty close in for that, especially considering the total mass of the black hole ... but I may be overanalysing.</description>
		<content:encoded><![CDATA[<p>Really, just going to warp should have worked on several levels. Most notably the fact that the warp field reduces the &#8220;visible&#8221; or &#8220;apparent&#8221; mass of the starship to zero allowing the whole faster-than-light thing to happen (Remember that episode when Q was made human, and he told Geordi to change the gravitational constant? All they had to do was throw a warp field around it).</p>
<p>Unless they were too close in for Warp 6ish to kick them out of the event horizon. But they&#8217;d have to be pretty close in for that, especially considering the total mass of the black hole &#8230; but I may be overanalysing.</p>
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		<title>By: Brad H.</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335623</link>
		<dc:creator>Brad H.</dc:creator>
		<pubDate>Wed, 24 Nov 2010 23:42:52 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335623</guid>
		<description>&quot;The mass of the ship is meaningless to the black hole; the acceleration is the same no matter what mass the ship has.&quot;

Wait, what?  Am I the only one confused by this statement.  I thought black holes exerted gravitational forces, in which case mass (of each body) would matter?  Jettisoning the engines into the blackhole would just be transferring the mass, so zero sum right?</description>
		<content:encoded><![CDATA[<p>&#8220;The mass of the ship is meaningless to the black hole; the acceleration is the same no matter what mass the ship has.&#8221;</p>
<p>Wait, what?  Am I the only one confused by this statement.  I thought black holes exerted gravitational forces, in which case mass (of each body) would matter?  Jettisoning the engines into the blackhole would just be transferring the mass, so zero sum right?</p>
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		<title>By: Joseph G</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335527</link>
		<dc:creator>Joseph G</dc:creator>
		<pubDate>Wed, 24 Nov 2010 19:32:46 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335527</guid>
		<description>@#58 Messier Tidy:  Bwahahaha :D

I&#039;m wondering about that change in ST:TNG uniforms - did they give the high ranking officers red shirts on purpose, to dispell the whole red-shirt gag among fans? 
Didn&#039;t seem to work, in any case :D</description>
		<content:encoded><![CDATA[<p>@#58 Messier Tidy:  Bwahahaha <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_biggrin.gif' alt=':D' class='wp-smiley' /> </p>
<p>I&#8217;m wondering about that change in ST:TNG uniforms &#8211; did they give the high ranking officers red shirts on purpose, to dispell the whole red-shirt gag among fans?<br />
Didn&#8217;t seem to work, in any case <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_biggrin.gif' alt=':D' class='wp-smiley' /> </p>
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		<title>By: Joseph G</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335526</link>
		<dc:creator>Joseph G</dc:creator>
		<pubDate>Wed, 24 Nov 2010 19:31:52 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335526</guid>
		<description>That warp-core ejection bit is just plain ridiculous for another reason (besides the rather important bit about getting fried by radiation).  Even if the detonating antimatter is surrounded by enough mass (and it&#039;d take a helluva lot) to turn all that gamma radiation into a (relatively) cool expanding fireball, you have to figure that the percentage of that energy that moves the ship would be miniscule.  It&#039;d be like trying to go up a steep hill by blowing up an entire tank of gasoline behind your car.  Surely the Enterprise&#039;s engines are more efficient then THAT?  

Granted, the idea of using nukes to move a ship isn&#039;t new (see Project Orion) - but those particular nukes would be fine-tuned to make sure that more of the weapon yield goes into pushing plasma against the pusher plate.  (Yes, I know antimatter annihilation and fission bombs are different things, but generally speaking, the results are more or less a question of magnitude)
And yes, the Enterprise lacks the enormous solid pusher plate and shock absorption system, so... ouch :)</description>
		<content:encoded><![CDATA[<p>That warp-core ejection bit is just plain ridiculous for another reason (besides the rather important bit about getting fried by radiation).  Even if the detonating antimatter is surrounded by enough mass (and it&#8217;d take a helluva lot) to turn all that gamma radiation into a (relatively) cool expanding fireball, you have to figure that the percentage of that energy that moves the ship would be miniscule.  It&#8217;d be like trying to go up a steep hill by blowing up an entire tank of gasoline behind your car.  Surely the Enterprise&#8217;s engines are more efficient then THAT?  </p>
<p>Granted, the idea of using nukes to move a ship isn&#8217;t new (see Project Orion) &#8211; but those particular nukes would be fine-tuned to make sure that more of the weapon yield goes into pushing plasma against the pusher plate.  (Yes, I know antimatter annihilation and fission bombs are different things, but generally speaking, the results are more or less a question of magnitude)<br />
And yes, the Enterprise lacks the enormous solid pusher plate and shock absorption system, so&#8230; ouch <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
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		<title>By: Messier Tidy Upper</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335480</link>
		<dc:creator>Messier Tidy Upper</dc:creator>
		<pubDate>Wed, 24 Nov 2010 16:25:37 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335480</guid>
		<description>Also one last point I cannot resist noting : 

We all know that Darth Vader can sense things through The Force right. 

So, therefore, the second that Spock Prime beams in at the very end shouldn&#039;t Vader sense that happening &amp; old Spock&#039;s hostile intentions &amp; thus spin around activating his lightsaber and chopping Spock Prime in half!? Y&#039;know just like Yoda did when that stormtrooper came up behind Yoda to carry out order 66? ;-)

Now &lt;i&gt;*that*&lt;/i&gt; - &amp; Vader ending with the line &lt;i&gt;&quot;Never underestimate the Pow-wah of the Dark side!&quot;&lt;/i&gt; would make an even better ending! ;-)

- In My Humble Opinion Naturally. </description>
		<content:encoded><![CDATA[<p>Also one last point I cannot resist noting : </p>
<p>We all know that Darth Vader can sense things through The Force right. </p>
<p>So, therefore, the second that Spock Prime beams in at the very end shouldn&#8217;t Vader sense that happening &#038; old Spock&#8217;s hostile intentions &#038; thus spin around activating his lightsaber and chopping Spock Prime in half!? Y&#8217;know just like Yoda did when that stormtrooper came up behind Yoda to carry out order 66? <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
<p>Now <i>*that*</i> &#8211; &#038; Vader ending with the line <i>&#8220;Never underestimate the Pow-wah of the Dark side!&#8221;</i> would make an even better ending! <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
<p>- In My Humble Opinion Naturally.</p>
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		<title>By: Messier Tidy Upper</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335432</link>
		<dc:creator>Messier Tidy Upper</dc:creator>
		<pubDate>Wed, 24 Nov 2010 12:55:31 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335432</guid>
		<description>@51.   Murff Says: 

&lt;blockquote&gt;&lt;i&gt;“Aye Captain”….slips on a yellow shirt
Best part right there.&lt;/i&gt;&lt;/blockquote&gt;

Indeed. :-) 

If I was running the Federation or their &#039;Occ. Health &amp; Safety&#039; division - I&#039;d seriously consider banning all employees from wearing red shirts - and even red clothes of any other type just to be safe. I&#039;m sure it would  more than halve their workplace fatalities rate! ;-)</description>
		<content:encoded><![CDATA[<p>@51.   Murff Says: </p>
<blockquote><p><i>“Aye Captain”….slips on a yellow shirt<br />
Best part right there.</i></p></blockquote>
<p>Indeed. <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' />  </p>
<p>If I was running the Federation or their &#8216;Occ. Health &#038; Safety&#8217; division &#8211; I&#8217;d seriously consider banning all employees from wearing red shirts &#8211; and even red clothes of any other type just to be safe. I&#8217;m sure it would  more than halve their workplace fatalities rate! <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
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		<title>By: Messier Tidy Upper</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335428</link>
		<dc:creator>Messier Tidy Upper</dc:creator>
		<pubDate>Wed, 24 Nov 2010 12:35:40 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335428</guid>
		<description>From the BA&#039;s original review &lt;i&gt;(^ linked above, awaiting moderation, posted 2009 May 8th, 11:32 PM)&lt;/i&gt; Dr Phil Plait wrote : 

*** 

&lt;blockquote&gt;&lt;b&gt;The Scene:&lt;/b&gt;

After The Final Battle, the Enterprise gets too close to the black hole! They’re getting drawn in, and Scotty says that if they eject the warp core and blow it up, the explosion might propel them to safety.

&lt;b&gt;The Science:&lt;/b&gt;

Simply put, that won’t work. Sorry Scotty!

On Earth, detonating a bomb creates a shock wave, an expanding wave of pressure as the force from the explosion propagates through the air. In space — wait for it, wait for it… — there’s no air! So you don’t get a shock wave. When the matter and antimatter in the core combine, you get a fierce blast of electromagnetic radiation (fancy science-talk for light) in the form of gamma rays, and an expanding very thin shell of vaporized atoms from the material in the warp core itself. 

To propel the Big E to safety, the bomb would have to transfer momentum to the ship. This is like hitting a pool ball with another one; the moving ball has momentum, which it then gives to the other one, causing it to move. Detonating the warp core would generate a lot of light, but only a tiny bit of mass would explode outward, so the momentum transfer would be minimal.

What would really happen is the ship would be vaporized from the massive release of energy. Oops! That would’ve made for a dramatic ending to the movie, but not a terribly satisfying one. 

[Oh I don&#039;t know about that! - Ed. ;-) ] 

(Bold original, cut&#039;n&#039;pasted from linked BA blog item.) 
&lt;/blockquote&gt;

*** 


So I&#039;d like to see the &lt;i&gt;&quot;what would really happen&quot;&lt;/i&gt; science version where the &lt;i&gt;Enterprise&lt;/i&gt; starts to sphaghettify then Scotty dumps the warp cores which vaporise the whole ship in a huge soundless flash of light explosion leaving just the black hole. 

My cruel side would like to see the expression on the Trekkies faces as they realise Kirk et al have been totally vapourised and wiped out once and for all! :-o
 
&lt;i&gt;(Or have they - parallel universes, time travel redos and all considered!)&lt;/i&gt; 

I don&#039;t mind &lt;i&gt;Star Trek&lt;/i&gt; I really don&#039;t but .. ;-)

Then the newly minted red matter black hole pulls Earth out of its orbit  - along with Mars and our Moon and we watch as the Earth fries or freezes with a brief shot of the gravitational effects causing huge moonquakes and Mars-quakes sending Humanity extinct as well. 

Followed by the closing line - not &lt;i&gt;&#039;The End&#039;&lt;/i&gt; but a huge bold &lt;b&gt;&#039;D&#039;oh!&#039;&lt;/b&gt; aa-aand roll credits!  ;-)

</description>
		<content:encoded><![CDATA[<p>From the BA&#8217;s original review <i>(^ linked above, awaiting moderation, posted 2009 May 8th, 11:32 PM)</i> Dr Phil Plait wrote : </p>
<p>*** </p>
<blockquote><p><b>The Scene:</b></p>
<p>After The Final Battle, the Enterprise gets too close to the black hole! They’re getting drawn in, and Scotty says that if they eject the warp core and blow it up, the explosion might propel them to safety.</p>
<p><b>The Science:</b></p>
<p>Simply put, that won’t work. Sorry Scotty!</p>
<p>On Earth, detonating a bomb creates a shock wave, an expanding wave of pressure as the force from the explosion propagates through the air. In space — wait for it, wait for it… — there’s no air! So you don’t get a shock wave. When the matter and antimatter in the core combine, you get a fierce blast of electromagnetic radiation (fancy science-talk for light) in the form of gamma rays, and an expanding very thin shell of vaporized atoms from the material in the warp core itself. </p>
<p>To propel the Big E to safety, the bomb would have to transfer momentum to the ship. This is like hitting a pool ball with another one; the moving ball has momentum, which it then gives to the other one, causing it to move. Detonating the warp core would generate a lot of light, but only a tiny bit of mass would explode outward, so the momentum transfer would be minimal.</p>
<p>What would really happen is the ship would be vaporized from the massive release of energy. Oops! That would’ve made for a dramatic ending to the movie, but not a terribly satisfying one. </p>
<p>[Oh I don't know about that! - Ed. <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' />  ] </p>
<p>(Bold original, cut&#8217;n'pasted from linked BA blog item.)
</p></blockquote>
<p>*** </p>
<p>So I&#8217;d like to see the <i>&#8220;what would really happen&#8221;</i> science version where the <i>Enterprise</i> starts to sphaghettify then Scotty dumps the warp cores which vaporise the whole ship in a huge soundless flash of light explosion leaving just the black hole. </p>
<p>My cruel side would like to see the expression on the Trekkies faces as they realise Kirk et al have been totally vapourised and wiped out once and for all! <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_surprised.gif' alt=':-o' class='wp-smiley' /> </p>
<p><i>(Or have they &#8211; parallel universes, time travel redos and all considered!)</i> </p>
<p>I don&#8217;t mind <i>Star Trek</i> I really don&#8217;t but .. <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
<p>Then the newly minted red matter black hole pulls Earth out of its orbit  &#8211; along with Mars and our Moon and we watch as the Earth fries or freezes with a brief shot of the gravitational effects causing huge moonquakes and Mars-quakes sending Humanity extinct as well. </p>
<p>Followed by the closing line &#8211; not <i>&#8216;The End&#8217;</i> but a huge bold <b>&#8216;D&#8217;oh!&#8217;</b> aa-aand roll credits!  <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
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		<title>By: Messier Tidy Upper</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335385</link>
		<dc:creator>Messier Tidy Upper</dc:creator>
		<pubDate>Wed, 24 Nov 2010 08:25:48 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335385</guid>
		<description>@44.   Jamie Mueller Says: 

&lt;blockquote&gt;&lt;i&gt;@42 Messier: “Was I the the only person bothered about the fact that the Trek “altquel”** created a black hole near the Earth at the end of the movie? I mean, think of the gravity &amp; its effects on the solar system!”
They didn’t: Just before that point Spock jumps to warp (granted for not very long) to get away and they follow–presumably he goes far enough away from earth so that the new black hole doesn’t have much affect.&lt;/i&gt;&lt;/blockquote&gt;

Hmm... Thanks :-)

But I must say I&#039;m not entirely convinced. It was a &lt;b&gt;*very*&lt;/b&gt; short jump after all and having something with the mass of a black hole suddenly appear in our solar system anywhere or even just right next to it? I don&#039;t think that&#039;d be good.

BTW. The BA&#039;s review of the &lt;i&gt;Trek &lt;/i&gt; rebooted movie is here :

http://blogs.discovermagazine.com/badastronomy/2009/05/08/ba-review-star-trek/ 

Personally, Ithought it was a fun fast-paced flick which I kinda enjoyed but the dreadful bad science of it and the convenience-itis factor of the weak plot.  *Facepalm* </description>
		<content:encoded><![CDATA[<p>@44.   Jamie Mueller Says: </p>
<blockquote><p><i>@42 Messier: “Was I the the only person bothered about the fact that the Trek “altquel”** created a black hole near the Earth at the end of the movie? I mean, think of the gravity &#038; its effects on the solar system!”<br />
They didn’t: Just before that point Spock jumps to warp (granted for not very long) to get away and they follow–presumably he goes far enough away from earth so that the new black hole doesn’t have much affect.</i></p></blockquote>
<p>Hmm&#8230; Thanks <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /> </p>
<p>But I must say I&#8217;m not entirely convinced. It was a <b>*very*</b> short jump after all and having something with the mass of a black hole suddenly appear in our solar system anywhere or even just right next to it? I don&#8217;t think that&#8217;d be good.</p>
<p>BTW. The BA&#8217;s review of the <i>Trek </i> rebooted movie is here :</p>
<p><a href="http://blogs.discovermagazine.com/badastronomy/2009/05/08/ba-review-star-trek/" rel="nofollow">http://blogs.discovermagazine.com/badastronomy/2009/05/08/ba-review-star-trek/</a> </p>
<p>Personally, Ithought it was a fun fast-paced flick which I kinda enjoyed but the dreadful bad science of it and the convenience-itis factor of the weak plot.  *Facepalm*</p>
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		<title>By: Joseph G</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335207</link>
		<dc:creator>Joseph G</dc:creator>
		<pubDate>Tue, 23 Nov 2010 19:33:40 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335207</guid>
		<description>@#50 Anchor:  I&#039;ll bet you had fun as a little kid watching Saturday morning cartoons and saying &quot;Hah! That&#039;s impossible!&quot; every 10 seconds or so.</description>
		<content:encoded><![CDATA[<p>@#50 Anchor:  I&#8217;ll bet you had fun as a little kid watching Saturday morning cartoons and saying &#8220;Hah! That&#8217;s impossible!&#8221; every 10 seconds or so.</p>
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		<title>By: Joseph G</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335206</link>
		<dc:creator>Joseph G</dc:creator>
		<pubDate>Tue, 23 Nov 2010 19:30:43 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335206</guid>
		<description>@#54:  Exactly!  I must confess I haven&#039;t seen the movie, but I would assume that the enterprise is in orbit around the planet anyway, rather then hovering there on engine thrust.  
So now instead of orbiting a planet, it&#039;s orbiting a black hole roughly the size of a marble (I&#039;m probably off on that size, but not by more then a few orders of magnitude :P  ).</description>
		<content:encoded><![CDATA[<p>@#54:  Exactly!  I must confess I haven&#8217;t seen the movie, but I would assume that the enterprise is in orbit around the planet anyway, rather then hovering there on engine thrust.<br />
So now instead of orbiting a planet, it&#8217;s orbiting a black hole roughly the size of a marble (I&#8217;m probably off on that size, but not by more then a few orders of magnitude <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_razz.gif' alt=':P' class='wp-smiley' />   ).</p>
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		<title>By: Zaphod</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335174</link>
		<dc:creator>Zaphod</dc:creator>
		<pubDate>Tue, 23 Nov 2010 17:02:03 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335174</guid>
		<description>The correct ending (besides &#039;nothing happens&#039;; the planet doesn&#039;t magically become an ultramassive force sucking everything into it just because it is now a black hole) is that without perfect aim and guidance, they miss the singularity&#039;s event horizon and just slingshot around it and are now in a highly eccentric elliptical orbit around the black hole with an aphelion pretty much where they started. If they manage to fall directly on a collision course with the singularity, the Enterprise is ripped into subatomic particles (by tidal forces) that fall forever into the black hole.</description>
		<content:encoded><![CDATA[<p>The correct ending (besides &#8216;nothing happens&#8217;; the planet doesn&#8217;t magically become an ultramassive force sucking everything into it just because it is now a black hole) is that without perfect aim and guidance, they miss the singularity&#8217;s event horizon and just slingshot around it and are now in a highly eccentric elliptical orbit around the black hole with an aphelion pretty much where they started. If they manage to fall directly on a collision course with the singularity, the Enterprise is ripped into subatomic particles (by tidal forces) that fall forever into the black hole.</p>
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		<title>By: Wildride</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335143</link>
		<dc:creator>Wildride</dc:creator>
		<pubDate>Tue, 23 Nov 2010 15:09:55 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335143</guid>
		<description>... Shatner wakes up and it was it a bad dream.  An awful, awful, horribly written bad dream.</description>
		<content:encoded><![CDATA[<p>&#8230; Shatner wakes up and it was it a bad dream.  An awful, awful, horribly written bad dream.</p>
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		<title>By: JediBear</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-335102</link>
		<dc:creator>JediBear</dc:creator>
		<pubDate>Tue, 23 Nov 2010 10:21:38 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-335102</guid>
		<description>Anyone who&#039;s actually watched Star Trek should know Spock is usually wrong on the science. Not sometimes. Usually.</description>
		<content:encoded><![CDATA[<p>Anyone who&#8217;s actually watched Star Trek should know Spock is usually wrong on the science. Not sometimes. Usually.</p>
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		<title>By: Murff</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-2/#comment-334973</link>
		<dc:creator>Murff</dc:creator>
		<pubDate>Mon, 22 Nov 2010 23:04:52 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334973</guid>
		<description>&quot;Aye Captain&quot;....slips on a yellow shirt

Best part right there.</description>
		<content:encoded><![CDATA[<p>&#8220;Aye Captain&#8221;&#8230;.slips on a yellow shirt</p>
<p>Best part right there.</p>
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		<title>By: Anchor</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334972</link>
		<dc:creator>Anchor</dc:creator>
		<pubDate>Mon, 22 Nov 2010 23:02:19 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334972</guid>
		<description>#45 mike burkhart Says: 
&quot;All they have to do is go thro the Guardian of forever back to the 1960s .Where it all started. (By the way I would like someone to answer the questions I and many have about the Guardian of forever: like who built it?,what happened to the civilazion that built it? what about the city it was found is how big was it ? the ruins extended to the horizon that makes me wonder if it covered the hole planet and they resembled Greek and Roman bulidings was it possiable the builders used the Gaurdian to go to Earth and adopted Greek and Roman archtecure? lets have the answers)&quot;

The answer?

1. Fiction.

2. Fiction.

3. Fiction.

4. The whim of the next hack writer who writes a tale - take your pick of fictional scenarios specifically designed to titilate Star Trek fans for further profit: real science has absolutely positively nothing, without a shred of connection other than mention, whatsoever to do with it.

I trust these would be reason enough for even the most rabid Star Trek afficianado to  accede that what FICTIONS they watch on a Big Screen orchestrated by Hollywood isn&#039;t necessarily true to any authentic science, let alone any remote semblance of reality.</description>
		<content:encoded><![CDATA[<p>#45 mike burkhart Says:<br />
&#8220;All they have to do is go thro the Guardian of forever back to the 1960s .Where it all started. (By the way I would like someone to answer the questions I and many have about the Guardian of forever: like who built it?,what happened to the civilazion that built it? what about the city it was found is how big was it ? the ruins extended to the horizon that makes me wonder if it covered the hole planet and they resembled Greek and Roman bulidings was it possiable the builders used the Gaurdian to go to Earth and adopted Greek and Roman archtecure? lets have the answers)&#8221;</p>
<p>The answer?</p>
<p>1. Fiction.</p>
<p>2. Fiction.</p>
<p>3. Fiction.</p>
<p>4. The whim of the next hack writer who writes a tale &#8211; take your pick of fictional scenarios specifically designed to titilate Star Trek fans for further profit: real science has absolutely positively nothing, without a shred of connection other than mention, whatsoever to do with it.</p>
<p>I trust these would be reason enough for even the most rabid Star Trek afficianado to  accede that what FICTIONS they watch on a Big Screen orchestrated by Hollywood isn&#8217;t necessarily true to any authentic science, let alone any remote semblance of reality.</p>
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		<title>By: Matt B.</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334942</link>
		<dc:creator>Matt B.</dc:creator>
		<pubDate>Mon, 22 Nov 2010 22:11:56 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334942</guid>
		<description>Actually, how it should have ended is:

&quot;Using a minor amount of thrust, the Enterprise easily drifts away from the  pinprick-size black hole that has only as much mass as the mining craft that became it. The black hole eventually evaporates due to Hawking radiation.&quot;

A common mistake of TV and movie sci-fi is indicating that black holes have stronger gravity &lt;i&gt;at the same distance&lt;/i&gt; than the objects that went into making them. Stargate SG-1 has a particularly egregious example.</description>
		<content:encoded><![CDATA[<p>Actually, how it should have ended is:</p>
<p>&#8220;Using a minor amount of thrust, the Enterprise easily drifts away from the  pinprick-size black hole that has only as much mass as the mining craft that became it. The black hole eventually evaporates due to Hawking radiation.&#8221;</p>
<p>A common mistake of TV and movie sci-fi is indicating that black holes have stronger gravity <i>at the same distance</i> than the objects that went into making them. Stargate SG-1 has a particularly egregious example.</p>
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		<title>By: Joseph G</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334909</link>
		<dc:creator>Joseph G</dc:creator>
		<pubDate>Mon, 22 Nov 2010 20:53:23 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334909</guid>
		<description>Regarding spaghettification: Correct me if I&#039;m wrong, but I&#039;ve heard that the most massive of supermassive black holes can have event horizons so huge that the average density of the BH within the event horizon is less then that of water.  Supposedly, tidal gradients around such objects are so mild that you could easily reach the event horizon without getting spaghettified.  
Of course, you&#039;d still get spaghettified quite spectacularly as you move closer to the singularity, but at least no outside observers would have to see it  ;)

Regarding tidal forces, a nice (physically accurate, as far as I know, with the exception of some unobtanium in the ship&#039;s hull) short story on the topic is &quot;Neutron Star&quot; by Larry Niven.  It&#039;s not about a black hole, of course, but some of the issues encountered near a small BH are similar.</description>
		<content:encoded><![CDATA[<p>Regarding spaghettification: Correct me if I&#8217;m wrong, but I&#8217;ve heard that the most massive of supermassive black holes can have event horizons so huge that the average density of the BH within the event horizon is less then that of water.  Supposedly, tidal gradients around such objects are so mild that you could easily reach the event horizon without getting spaghettified.<br />
Of course, you&#8217;d still get spaghettified quite spectacularly as you move closer to the singularity, but at least no outside observers would have to see it  <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';)' class='wp-smiley' /> </p>
<p>Regarding tidal forces, a nice (physically accurate, as far as I know, with the exception of some unobtanium in the ship&#8217;s hull) short story on the topic is &#8220;Neutron Star&#8221; by Larry Niven.  It&#8217;s not about a black hole, of course, but some of the issues encountered near a small BH are similar.</p>
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		<title>By: Joseph G</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334908</link>
		<dc:creator>Joseph G</dc:creator>
		<pubDate>Mon, 22 Nov 2010 20:49:08 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334908</guid>
		<description>What I don&#039;t get is why every sci-fi ship in this situation always tries to thrust directly away from the black hole.  Granted, tidal forces could get nasty if you swing too close, but if you thrust perpendicular to the gravitational force from the black hole (putting yourself in an orbit, or at least an orbital section), you&#039;ll have quite a bit more time to accelerate.  
In fact, the odds of just tooling along through space and falling directly into the event horizon are slim anyway - black holes are relatively compact.  That&#039;s why you get accretion discs, right?  Randomly distributed matter normally is curved toward the gravitating object, but usually doesn&#039;t hit it (at least, right away).</description>
		<content:encoded><![CDATA[<p>What I don&#8217;t get is why every sci-fi ship in this situation always tries to thrust directly away from the black hole.  Granted, tidal forces could get nasty if you swing too close, but if you thrust perpendicular to the gravitational force from the black hole (putting yourself in an orbit, or at least an orbital section), you&#8217;ll have quite a bit more time to accelerate.<br />
In fact, the odds of just tooling along through space and falling directly into the event horizon are slim anyway &#8211; black holes are relatively compact.  That&#8217;s why you get accretion discs, right?  Randomly distributed matter normally is curved toward the gravitating object, but usually doesn&#8217;t hit it (at least, right away).</p>
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	<item>
		<title>By: tracer</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334899</link>
		<dc:creator>tracer</dc:creator>
		<pubDate>Mon, 22 Nov 2010 19:57:30 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334899</guid>
		<description>Sam wrote:

&quot;Aww they should have gotten spaghettified!&quot;


I concur!  We need to make &quot;Star Trek: How It Should Have Ended: How It Should Have Ended&quot;</description>
		<content:encoded><![CDATA[<p>Sam wrote:</p>
<p>&#8220;Aww they should have gotten spaghettified!&#8221;</p>
<p>I concur!  We need to make &#8220;Star Trek: How It Should Have Ended: How It Should Have Ended&#8221;</p>
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		<title>By: mike burkhart</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334885</link>
		<dc:creator>mike burkhart</dc:creator>
		<pubDate>Mon, 22 Nov 2010 19:07:43 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334885</guid>
		<description>Star Trek ending? NEVER STAR TREK FOREVER!!!!!!!!!!!!!!!!!!!!!!!All they have to do is go thro the Guardian of forever back to the 1960s .Where it all started. (By the way I would like someone to answer the questions I and many have about the Guardian of forever: like who built it?,what happened to the civilazion that built it? what about the city it was found is how big was it ? the ruins extended to the horizon that makes me wonder if it covered the hole planet and they resembled Greek and Roman bulidings was it possiable the builders used the Gaurdian to go to Earth and adopted Greek and Roman archtecure? lets have the answers)</description>
		<content:encoded><![CDATA[<p>Star Trek ending? NEVER STAR TREK FOREVER!!!!!!!!!!!!!!!!!!!!!!!All they have to do is go thro the Guardian of forever back to the 1960s .Where it all started. (By the way I would like someone to answer the questions I and many have about the Guardian of forever: like who built it?,what happened to the civilazion that built it? what about the city it was found is how big was it ? the ruins extended to the horizon that makes me wonder if it covered the hole planet and they resembled Greek and Roman bulidings was it possiable the builders used the Gaurdian to go to Earth and adopted Greek and Roman archtecure? lets have the answers)</p>
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		<title>By: Jamie Mueller</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334869</link>
		<dc:creator>Jamie Mueller</dc:creator>
		<pubDate>Mon, 22 Nov 2010 17:41:59 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334869</guid>
		<description>@42 Messier:

&quot;Was I the the only person bothered about the fact that the Trek “altquel”** created a black hole near the Earth at the end of the movie? I mean, think of the gravity &amp; its effects on the solar system!&quot;

They didn&#039;t: Just before that point Spock jumps to warp (granted for not very long) to get away and they follow--presumably he goes far enough away from earth so that the new black hole doesn&#039;t have much affect.</description>
		<content:encoded><![CDATA[<p>@42 Messier:</p>
<p>&#8220;Was I the the only person bothered about the fact that the Trek “altquel”** created a black hole near the Earth at the end of the movie? I mean, think of the gravity &#038; its effects on the solar system!&#8221;</p>
<p>They didn&#8217;t: Just before that point Spock jumps to warp (granted for not very long) to get away and they follow&#8211;presumably he goes far enough away from earth so that the new black hole doesn&#8217;t have much affect.</p>
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		<title>By: rob</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334840</link>
		<dc:creator>rob</dc:creator>
		<pubDate>Mon, 22 Nov 2010 15:56:43 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334840</guid>
		<description>@Hevach (30):

your argument is a classic appeal to authority. by invoking what Han Solo thinks, you have invalidated your whole line of reasoning.

:)</description>
		<content:encoded><![CDATA[<p>@Hevach (30):</p>
<p>your argument is a classic appeal to authority. by invoking what Han Solo thinks, you have invalidated your whole line of reasoning.</p>
<p> <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
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		<title>By: Messier Tidy Upper</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334820</link>
		<dc:creator>Messier Tidy Upper</dc:creator>
		<pubDate>Mon, 22 Nov 2010 14:05:32 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334820</guid>
		<description>@ ^ XPT :

Whose amirite? ;-) 

Yeah, Newton&#039;s something-th* law : For every action there is an equal and opposite reaction. 

Was I the the only person bothered about the fact that the Trek &quot;altquel&quot;** created a black hole near the Earth at the end of the movie? I mean, think of the gravity &amp; its effects on the solar system!   


Finally, I wonder how a Trek / Wars &#039;verse cross over would work? I don&#039;t mind ether of those Science fantasty series and each has its flaws and its moments of brilliance.  Trek has transporters which could indicate better technology but then there&#039;s the &lt;i&gt;Death Star&lt;/i&gt; and the Force. How would Kirk handle Jedi Vs Sith or Janeway and Seven of Nine manage against Han Solo and Princess Leia? I&#039;m sure somebody&#039;s done written something on that idea already and I&#039;m sure the rsults could be .. fascinating! ;-)  

---- 

* First? Second? Third? One of those I think, I forget which though.

** &lt;b&gt;Alt&lt;/b&gt;ernative universe se&lt;b&gt;quel&lt;/b&gt;. What? Is the BA the only one who can coin neologisms here or something? ;-)</description>
		<content:encoded><![CDATA[<p>@ ^ XPT :</p>
<p>Whose amirite? <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' />  </p>
<p>Yeah, Newton&#8217;s something-th* law : For every action there is an equal and opposite reaction. </p>
<p>Was I the the only person bothered about the fact that the Trek &#8220;altquel&#8221;** created a black hole near the Earth at the end of the movie? I mean, think of the gravity &#038; its effects on the solar system!   </p>
<p>Finally, I wonder how a Trek / Wars &#8216;verse cross over would work? I don&#8217;t mind ether of those Science fantasty series and each has its flaws and its moments of brilliance.  Trek has transporters which could indicate better technology but then there&#8217;s the <i>Death Star</i> and the Force. How would Kirk handle Jedi Vs Sith or Janeway and Seven of Nine manage against Han Solo and Princess Leia? I&#8217;m sure somebody&#8217;s done written something on that idea already and I&#8217;m sure the rsults could be .. fascinating! <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' />   </p>
<p>&#8212;- </p>
<p>* First? Second? Third? One of those I think, I forget which though.</p>
<p>** <b>Alt</b>ernative universe se<b>quel</b>. What? Is the BA the only one who can coin neologisms here or something? <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
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		<title>By: XPT</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334819</link>
		<dc:creator>XPT</dc:creator>
		<pubDate>Mon, 22 Nov 2010 13:19:15 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334819</guid>
		<description>Besides, even if they have no engine, dumping stuff towards the black hole pushes the ship forward, amirite?</description>
		<content:encoded><![CDATA[<p>Besides, even if they have no engine, dumping stuff towards the black hole pushes the ship forward, amirite?</p>
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		<title>By: Grand Lunar</title>
		<link>http://blogs.discovermagazine.com/badastronomy/2010/11/21/retcon-artist/comment-page-1/#comment-334818</link>
		<dc:creator>Grand Lunar</dc:creator>
		<pubDate>Mon, 22 Nov 2010 13:06:08 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/badastronomy/?p=24264#comment-334818</guid>
		<description>This is a great video series, Phil.
And I figured this one was in your territory. :)





Spoiler Alert!:

Loved how Nimoy nerve pinches Vader at the end. Classic!</description>
		<content:encoded><![CDATA[<p>This is a great video series, Phil.<br />
And I figured this one was in your territory. <img src='http://blogs.discovermagazine.com/badastronomy/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
<p>Spoiler Alert!:</p>
<p>Loved how Nimoy nerve pinches Vader at the end. Classic!</p>
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