<article>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#article10_03_27_1355226</id>
	<title>Tiny Cube Drags Space Debris From Orbit</title>
	<author>Soulskill</author>
	<datestamp>1269703260000</datestamp>
	<htmltext>krou writes <i>"A team from <a href="http://www.ee.surrey.ac.uk/SSC/">Surrey Space Centre</a> has developed a device called a CubeSail, designed to be attached to satellites and rocket stages in order to <a href="http://news.bbc.co.uk./1/hi/sci/tech/8590103.stm?ls">drag space debris from orbit</a>. CubeSail is a nanosatellite, weighing 3kg (6.6lb), and measures 10cm x 10cm x 30cm. Within its frame is a polymer sheet that unfurls itself once in space. 'The simple deployment mechanism features four metal strips that are wound under tension and will snap into a straight line when let go, pulling the sheet flat in the process.' The overall idea is that 'Residual air molecules still present in the spacecraft's low-Earth orbit will catch the sheet and pull the object out of the sky much faster than is normal.' Sir Martin Sweeting, the chairman of <a href="http://www.sstl.co.uk/">SSTL</a>, who supported the research, said, 'We would be looking to put it on our own satellites and to put it on other people's spacecraft as well. We want this to be a standard, essential bolt-on item for a spacecraft; and that's why it's very important to make it small, because if it's too big it will interfere with the rest of the spacecraft.' The team is also hoping that CubeSail can act as a propulsion system, using 'solar sailing' to help satellites keep their orbits more efficiently."</i></htmltext>
<tokenext>krou writes " A team from Surrey Space Centre has developed a device called a CubeSail , designed to be attached to satellites and rocket stages in order to drag space debris from orbit .
CubeSail is a nanosatellite , weighing 3kg ( 6.6lb ) , and measures 10cm x 10cm x 30cm .
Within its frame is a polymer sheet that unfurls itself once in space .
'The simple deployment mechanism features four metal strips that are wound under tension and will snap into a straight line when let go , pulling the sheet flat in the process .
' The overall idea is that 'Residual air molecules still present in the spacecraft 's low-Earth orbit will catch the sheet and pull the object out of the sky much faster than is normal .
' Sir Martin Sweeting , the chairman of SSTL , who supported the research , said , 'We would be looking to put it on our own satellites and to put it on other people 's spacecraft as well .
We want this to be a standard , essential bolt-on item for a spacecraft ; and that 's why it 's very important to make it small , because if it 's too big it will interfere with the rest of the spacecraft .
' The team is also hoping that CubeSail can act as a propulsion system , using 'solar sailing ' to help satellites keep their orbits more efficiently .
"</tokentext>
<sentencetext>krou writes "A team from Surrey Space Centre has developed a device called a CubeSail, designed to be attached to satellites and rocket stages in order to drag space debris from orbit.
CubeSail is a nanosatellite, weighing 3kg (6.6lb), and measures 10cm x 10cm x 30cm.
Within its frame is a polymer sheet that unfurls itself once in space.
'The simple deployment mechanism features four metal strips that are wound under tension and will snap into a straight line when let go, pulling the sheet flat in the process.
' The overall idea is that 'Residual air molecules still present in the spacecraft's low-Earth orbit will catch the sheet and pull the object out of the sky much faster than is normal.
' Sir Martin Sweeting, the chairman of SSTL, who supported the research, said, 'We would be looking to put it on our own satellites and to put it on other people's spacecraft as well.
We want this to be a standard, essential bolt-on item for a spacecraft; and that's why it's very important to make it small, because if it's too big it will interfere with the rest of the spacecraft.
' The team is also hoping that CubeSail can act as a propulsion system, using 'solar sailing' to help satellites keep their orbits more efficiently.
"</sentencetext>
</article>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639904</id>
	<title>You know what STILL stays on my mind?</title>
	<author>Anonymous</author>
	<datestamp>1269708600000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Your freakin' Windsong, that's what.  Enuff already !!</p></htmltext>
<tokenext>Your freakin ' Windsong , that 's what .
Enuff already !
!</tokentext>
<sentencetext>Your freakin' Windsong, that's what.
Enuff already !
!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31641878</id>
	<title>Re:Tiny cube</title>
	<author>Forty Two Tenfold</author>
	<datestamp>1269721860000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Am I the only one who was momentarily haunted by a one-word thought, "Borg"?</p></htmltext>
<tokenext>Am I the only one who was momentarily haunted by a one-word thought , " Borg " ?</tokentext>
<sentencetext>Am I the only one who was momentarily haunted by a one-word thought, "Borg"?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639682</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640680</id>
	<title>"nano"?</title>
	<author>Anonymous</author>
	<datestamp>1269712980000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>I'm so tired of this buzzword. Nanotechnology was supposed to be about molecular machines to manufacture things cheaply and fix the human body.<br>This is a fucking tin can in space. It's about 1/10 the size of Sputnik. It's a decisatellite. It's not "tiny".</p><p>STOP CALLING EVERYTHING NANO.</p></htmltext>
<tokenext>I 'm so tired of this buzzword .
Nanotechnology was supposed to be about molecular machines to manufacture things cheaply and fix the human body.This is a fucking tin can in space .
It 's about 1/10 the size of Sputnik .
It 's a decisatellite .
It 's not " tiny " .STOP CALLING EVERYTHING NANO .</tokentext>
<sentencetext>I'm so tired of this buzzword.
Nanotechnology was supposed to be about molecular machines to manufacture things cheaply and fix the human body.This is a fucking tin can in space.
It's about 1/10 the size of Sputnik.
It's a decisatellite.
It's not "tiny".STOP CALLING EVERYTHING NANO.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31646076</id>
	<title>Re:Tiny cube</title>
	<author>wgoodman</author>
	<datestamp>1269770880000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>2</modscore>
	<htmltext><p>Am I the only one who is bothered by them calling a 10x10x30 device a "cube"?</p></htmltext>
<tokenext>Am I the only one who is bothered by them calling a 10x10x30 device a " cube " ?</tokentext>
<sentencetext>Am I the only one who is bothered by them calling a 10x10x30 device a "cube"?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639682</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640020</id>
	<title>Re:Cube?</title>
	<author>D Ninja</author>
	<datestamp>1269709500000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>It's actually known as a 3U (Unit) CubeSat.  It really is three 10x10x10 cube satellites stacked together.  Given the various restraints on such a small technology, it sometimes makes more sense to combine a few of them together so you'll have enough power, room for payloads, etc on your satellite as a whole.</p></htmltext>
<tokenext>It 's actually known as a 3U ( Unit ) CubeSat .
It really is three 10x10x10 cube satellites stacked together .
Given the various restraints on such a small technology , it sometimes makes more sense to combine a few of them together so you 'll have enough power , room for payloads , etc on your satellite as a whole .</tokentext>
<sentencetext>It's actually known as a 3U (Unit) CubeSat.
It really is three 10x10x10 cube satellites stacked together.
Given the various restraints on such a small technology, it sometimes makes more sense to combine a few of them together so you'll have enough power, room for payloads, etc on your satellite as a whole.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639712</id>
	<title>Unfurled once it reaches orbit?</title>
	<author>Low Ranked Craig</author>
	<datestamp>1269707160000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Maybe I'm not getting it, but it seems to me that the article says that the device is unfurled once the satellite reaches orbit, so it starts to decay the orbit immediately?  This also seems incompatible with this statement:  "The team is also hoping that CubeSail can act as a propulsion system, using 'solar sailing' to help satellites keep their orbits more efficiently."</p><p>Seems like a good idea, but I'd think you'd deploy it remotely once the satellite reached end of life?</p></htmltext>
<tokenext>Maybe I 'm not getting it , but it seems to me that the article says that the device is unfurled once the satellite reaches orbit , so it starts to decay the orbit immediately ?
This also seems incompatible with this statement : " The team is also hoping that CubeSail can act as a propulsion system , using 'solar sailing ' to help satellites keep their orbits more efficiently .
" Seems like a good idea , but I 'd think you 'd deploy it remotely once the satellite reached end of life ?</tokentext>
<sentencetext>Maybe I'm not getting it, but it seems to me that the article says that the device is unfurled once the satellite reaches orbit, so it starts to decay the orbit immediately?
This also seems incompatible with this statement:  "The team is also hoping that CubeSail can act as a propulsion system, using 'solar sailing' to help satellites keep their orbits more efficiently.
"Seems like a good idea, but I'd think you'd deploy it remotely once the satellite reached end of life?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639724</id>
	<title>Did they just...</title>
	<author>Anonymous</author>
	<datestamp>1269707280000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>invent a bag?</p></htmltext>
<tokenext>invent a bag ?</tokentext>
<sentencetext>invent a bag?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639978</id>
	<title>Is this really a net gain?</title>
	<author>Anonymous</author>
	<datestamp>1269709260000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>A satellite's lifetime collision risk depends on the volume of space it sweeps out before the cumulative drag adds up to a de-orbit.  The sail does not reduce that volume, it just sweeps it out in a shorter time.  I guess there is some net benefit, since a collision with the sail will create a smaller debris cloud.</htmltext>
<tokenext>A satellite 's lifetime collision risk depends on the volume of space it sweeps out before the cumulative drag adds up to a de-orbit .
The sail does not reduce that volume , it just sweeps it out in a shorter time .
I guess there is some net benefit , since a collision with the sail will create a smaller debris cloud .</tokentext>
<sentencetext>A satellite's lifetime collision risk depends on the volume of space it sweeps out before the cumulative drag adds up to a de-orbit.
The sail does not reduce that volume, it just sweeps it out in a shorter time.
I guess there is some net benefit, since a collision with the sail will create a smaller debris cloud.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640062</id>
	<title>Re:Unfurled once it reaches orbit?</title>
	<author>wizardforce</author>
	<datestamp>1269709800000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>this device wouldwork to degreade an orbit due to drag in LEO but in HEO,Geosynchronous or other higher orbits, it could have a reflective coating to use sun light to alter the orbit.</p></htmltext>
<tokenext>this device wouldwork to degreade an orbit due to drag in LEO but in HEO,Geosynchronous or other higher orbits , it could have a reflective coating to use sun light to alter the orbit .</tokentext>
<sentencetext>this device wouldwork to degreade an orbit due to drag in LEO but in HEO,Geosynchronous or other higher orbits, it could have a reflective coating to use sun light to alter the orbit.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639712</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640734</id>
	<title>Doesn't look like a cube</title>
	<author>Space Guerilla</author>
	<datestamp>1269713520000</datestamp>
	<modclass>Redundant</modclass>
	<modscore>0</modscore>
	<htmltext>Why are marketing teams slinging out buzz words like Nano and cube all the time.
When they are not even close to being scientifically accurate.
<p>
The dimensions are 10mm x 10mm x 30mm.
I guess Rectangular Sail doesn't have the same ring to it.
</p><p>
Its not Nano either. That would mean... 10^-9 meters
</p><p>
What if they start putting nano-machines in space, cubed nano machines?
It should be called a Deci-Satellite (10^-1). That way the magnitude is accurate (1 decimeter ~<nobr> <wbr></nobr>.328 feet)
</p></htmltext>
<tokenext>Why are marketing teams slinging out buzz words like Nano and cube all the time .
When they are not even close to being scientifically accurate .
The dimensions are 10mm x 10mm x 30mm .
I guess Rectangular Sail does n't have the same ring to it .
Its not Nano either .
That would mean... 10 ^ -9 meters What if they start putting nano-machines in space , cubed nano machines ?
It should be called a Deci-Satellite ( 10 ^ -1 ) .
That way the magnitude is accurate ( 1 decimeter ~ .328 feet )</tokentext>
<sentencetext>Why are marketing teams slinging out buzz words like Nano and cube all the time.
When they are not even close to being scientifically accurate.
The dimensions are 10mm x 10mm x 30mm.
I guess Rectangular Sail doesn't have the same ring to it.
Its not Nano either.
That would mean... 10^-9 meters

What if they start putting nano-machines in space, cubed nano machines?
It should be called a Deci-Satellite (10^-1).
That way the magnitude is accurate (1 decimeter ~ .328 feet)
</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31643544</id>
	<title>Galaxy Quest?</title>
	<author>IonOtter</author>
	<datestamp>1269693180000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Sarris:  What you fail to realize, is that with your shields down, my ship will tear through yours like tissue paper!</p><p>Jason:  Yes.  But what <i>you</i> fail to realize is that <i>my</i> ship is dragging MINES!</p></htmltext>
<tokenext>Sarris : What you fail to realize , is that with your shields down , my ship will tear through yours like tissue paper ! Jason : Yes .
But what you fail to realize is that my ship is dragging MINES !</tokentext>
<sentencetext>Sarris:  What you fail to realize, is that with your shields down, my ship will tear through yours like tissue paper!Jason:  Yes.
But what you fail to realize is that my ship is dragging MINES!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640666</id>
	<title>Re:Is this really a net gain?</title>
	<author>Anonymous</author>
	<datestamp>1269712920000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>1</modscore>
	<htmltext><p>The lifetime collision risk depends not only on the volume of space it sweeps out, it also depends on the amount of junk in its orbit.<br>Taking down satellites faster will reduce the amount of junk for active satellites. It won't do anything for the satellite it is attached to directly - but it will help reduce the collision risk for other satellites. Which, for companies like EADS or SSTL means they can keep launching satellites.</p></htmltext>
<tokenext>The lifetime collision risk depends not only on the volume of space it sweeps out , it also depends on the amount of junk in its orbit.Taking down satellites faster will reduce the amount of junk for active satellites .
It wo n't do anything for the satellite it is attached to directly - but it will help reduce the collision risk for other satellites .
Which , for companies like EADS or SSTL means they can keep launching satellites .</tokentext>
<sentencetext>The lifetime collision risk depends not only on the volume of space it sweeps out, it also depends on the amount of junk in its orbit.Taking down satellites faster will reduce the amount of junk for active satellites.
It won't do anything for the satellite it is attached to directly - but it will help reduce the collision risk for other satellites.
Which, for companies like EADS or SSTL means they can keep launching satellites.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639978</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</id>
	<title>Cube?</title>
	<author>Anonymous</author>
	<datestamp>1269708000000</datestamp>
	<modclass>Funny</modclass>
	<modscore>5</modscore>
	<htmltext><blockquote><div><p>measures 10cm x 10cm x 30cm</p></div></blockquote><p>
Someone tell these guys what a cube is.</p></div>
	</htmltext>
<tokenext>measures 10cm x 10cm x 30cm Someone tell these guys what a cube is .</tokentext>
<sentencetext>measures 10cm x 10cm x 30cm
Someone tell these guys what a cube is.
	</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31641000</id>
	<title>Why can't we use a tractor beam?</title>
	<author>Anonymous</author>
	<datestamp>1269715380000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>It seems to be all the rage on Start Trek. And what about the Earth's gravity? Mama Terra seems to losing her power. Gaia my ass.</p></htmltext>
<tokenext>It seems to be all the rage on Start Trek .
And what about the Earth 's gravity ?
Mama Terra seems to losing her power .
Gaia my ass .</tokentext>
<sentencetext>It seems to be all the rage on Start Trek.
And what about the Earth's gravity?
Mama Terra seems to losing her power.
Gaia my ass.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31641520</id>
	<title>Do not be deceived by size of this pilot vessel!</title>
	<author>ClosedSource</author>
	<datestamp>1269719040000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext><p>But first, the tranya.</p></htmltext>
<tokenext>But first , the tranya .</tokentext>
<sentencetext>But first, the tranya.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639700</id>
	<title>Should be required</title>
	<author>Laser Dan</author>
	<datestamp>1269707160000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Well it's definately a good idea to require something like this on all new satellites, but the major problem of all the existing debris still remains.</p><p>I was hoping that the polymer sheet would also slow down existing debris that passed nearby, but with such a thin sheet and such high speeds I doubt there would be any significant effect.</p></htmltext>
<tokenext>Well it 's definately a good idea to require something like this on all new satellites , but the major problem of all the existing debris still remains.I was hoping that the polymer sheet would also slow down existing debris that passed nearby , but with such a thin sheet and such high speeds I doubt there would be any significant effect .</tokentext>
<sentencetext>Well it's definately a good idea to require something like this on all new satellites, but the major problem of all the existing debris still remains.I was hoping that the polymer sheet would also slow down existing debris that passed nearby, but with such a thin sheet and such high speeds I doubt there would be any significant effect.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639746</id>
	<title>Is 25 sq m big enough?</title>
	<author>fotbr</author>
	<datestamp>1269707520000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Is this sail really big enough to do any good?  Sure, it can drag itself around, and maybe some of the smaller cube-sat type things made by colleges, but is a 25 sq m sail really going to matter much to a full-sized satellite?</p></htmltext>
<tokenext>Is this sail really big enough to do any good ?
Sure , it can drag itself around , and maybe some of the smaller cube-sat type things made by colleges , but is a 25 sq m sail really going to matter much to a full-sized satellite ?</tokentext>
<sentencetext>Is this sail really big enough to do any good?
Sure, it can drag itself around, and maybe some of the smaller cube-sat type things made by colleges, but is a 25 sq m sail really going to matter much to a full-sized satellite?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31644162</id>
	<title>ObFrink</title>
	<author>sharkey</author>
	<datestamp>1269700020000</datestamp>
	<modclass>Funny</modclass>
	<modscore>2</modscore>
	<htmltext>There could be cubes the size of gorillas in there!</htmltext>
<tokenext>There could be cubes the size of gorillas in there !</tokentext>
<sentencetext>There could be cubes the size of gorillas in there!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639848</id>
	<title>cube ?</title>
	<author>Spaham</author>
	<datestamp>1269708240000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext><p>"10cm x 10cm x 30cm"</p><p>what a cube !</p></htmltext>
<tokenext>" 10cm x 10cm x 30cm " what a cube !</tokentext>
<sentencetext>"10cm x 10cm x 30cm"what a cube !</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31647744</id>
	<title>Requires Control - Balloons are Spheres</title>
	<author>teeks99</author>
	<datestamp>1269795240000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>
Something like this would be really great for the industry.  If we could cut in half the amount of time it took every satellite to re-enter, the orbital debris problem would quickly get a lot better.
</p><p>
However, the idea proposed by this team seems rather complex, because the polymer sheet is two-dimensional, it requires an active control system to keep the width of the sheet oriented towards the direction of travel.  They talked about changing the center of mass and using magnetic torque control systems...all of which could fail over the years it would take to deorbit (after years of sitting dormant during the spacecraft's operational lifetime).
</p><p>
Instead, why not inflate a balloon?  There are already large weather-balloon type ones available, and it wouldn't take much gas to inflate it, since the external pressure is zero!  Once the balloon is inflated, it would have a orbital cross section that is similar to the polymer sheet, but since the balloon is roughly a sphere, you don't have to worry about controlling it.
</p><p>
The downside to this is that if a balloon gets hit by a micrometeorite, it could pop (I imagine SSTL's polymer sheets wouldn't handle one too well either).   Luckily, NASA and others have been working on an inflatable structure that uses gas to inflate, then once it is inflated it hardens so that it no longer relies on the pressure of the air to keep it in place.  This would allow for it to be punched full of holes and still keep providing some drag benefit.
</p></htmltext>
<tokenext>Something like this would be really great for the industry .
If we could cut in half the amount of time it took every satellite to re-enter , the orbital debris problem would quickly get a lot better .
However , the idea proposed by this team seems rather complex , because the polymer sheet is two-dimensional , it requires an active control system to keep the width of the sheet oriented towards the direction of travel .
They talked about changing the center of mass and using magnetic torque control systems...all of which could fail over the years it would take to deorbit ( after years of sitting dormant during the spacecraft 's operational lifetime ) .
Instead , why not inflate a balloon ?
There are already large weather-balloon type ones available , and it would n't take much gas to inflate it , since the external pressure is zero !
Once the balloon is inflated , it would have a orbital cross section that is similar to the polymer sheet , but since the balloon is roughly a sphere , you do n't have to worry about controlling it .
The downside to this is that if a balloon gets hit by a micrometeorite , it could pop ( I imagine SSTL 's polymer sheets would n't handle one too well either ) .
Luckily , NASA and others have been working on an inflatable structure that uses gas to inflate , then once it is inflated it hardens so that it no longer relies on the pressure of the air to keep it in place .
This would allow for it to be punched full of holes and still keep providing some drag benefit .</tokentext>
<sentencetext>
Something like this would be really great for the industry.
If we could cut in half the amount of time it took every satellite to re-enter, the orbital debris problem would quickly get a lot better.
However, the idea proposed by this team seems rather complex, because the polymer sheet is two-dimensional, it requires an active control system to keep the width of the sheet oriented towards the direction of travel.
They talked about changing the center of mass and using magnetic torque control systems...all of which could fail over the years it would take to deorbit (after years of sitting dormant during the spacecraft's operational lifetime).
Instead, why not inflate a balloon?
There are already large weather-balloon type ones available, and it wouldn't take much gas to inflate it, since the external pressure is zero!
Once the balloon is inflated, it would have a orbital cross section that is similar to the polymer sheet, but since the balloon is roughly a sphere, you don't have to worry about controlling it.
The downside to this is that if a balloon gets hit by a micrometeorite, it could pop (I imagine SSTL's polymer sheets wouldn't handle one too well either).
Luckily, NASA and others have been working on an inflatable structure that uses gas to inflate, then once it is inflated it hardens so that it no longer relies on the pressure of the air to keep it in place.
This would allow for it to be punched full of holes and still keep providing some drag benefit.
</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640172</id>
	<title>Re:Tiny cube</title>
	<author>Alex Belits</author>
	<datestamp>1269710400000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>Am I the only one who read that as "Time Cube Drags Space Debris From Orbit"?</p></div><p>No.</p></div>
	</htmltext>
<tokenext>Am I the only one who read that as " Time Cube Drags Space Debris From Orbit " ? No .</tokentext>
<sentencetext>Am I the only one who read that as "Time Cube Drags Space Debris From Orbit"?No.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639682</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639790</id>
	<title>Time Cube exposes evil. Cubelessness is an Evil.</title>
	<author>mattcsn</author>
	<datestamp>1269707820000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Oh, <i>tiny</i> cube. Thank goodness. This is proof that I need more coffee right now.</htmltext>
<tokenext>Oh , tiny cube .
Thank goodness .
This is proof that I need more coffee right now .</tokentext>
<sentencetext>Oh, tiny cube.
Thank goodness.
This is proof that I need more coffee right now.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31645374</id>
	<title>A solution in search of a problem.</title>
	<author>DerekLyons</author>
	<datestamp>1269714900000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Anything in a low enough orbit low enough that the 'CubeSail' would make a difference, is in an orbit low enough that it's going to come down anyhow.</p></htmltext>
<tokenext>Anything in a low enough orbit low enough that the 'CubeSail ' would make a difference , is in an orbit low enough that it 's going to come down anyhow .</tokentext>
<sentencetext>Anything in a low enough orbit low enough that the 'CubeSail' would make a difference, is in an orbit low enough that it's going to come down anyhow.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640502</id>
	<title>Big-time, Super-Big-Spendarifick Graffiti Project</title>
	<author>graffartist</author>
	<datestamp>1269712200000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>So funny, was thinking about the rather disturbing state of space-junk in orbit just last week, let myself drift off, to brainstorm. Wound up thinking what-if... NASA gave grants to artists, if they can solve some space issue. Wound up with a drawing of a chute of aerogel-like materials, built to gather up space-junk; which is then shot out into a trajectory to mash into an asteroid out in the belt, WHAM; SLAM; BAM; Walla! You have a great found object space graffiti piece, maybe the first? (later to be visited, if we ever get our collective arses out to the belt)</htmltext>
<tokenext>So funny , was thinking about the rather disturbing state of space-junk in orbit just last week , let myself drift off , to brainstorm .
Wound up thinking what-if... NASA gave grants to artists , if they can solve some space issue .
Wound up with a drawing of a chute of aerogel-like materials , built to gather up space-junk ; which is then shot out into a trajectory to mash into an asteroid out in the belt , WHAM ; SLAM ; BAM ; Walla !
You have a great found object space graffiti piece , maybe the first ?
( later to be visited , if we ever get our collective arses out to the belt )</tokentext>
<sentencetext>So funny, was thinking about the rather disturbing state of space-junk in orbit just last week, let myself drift off, to brainstorm.
Wound up thinking what-if... NASA gave grants to artists, if they can solve some space issue.
Wound up with a drawing of a chute of aerogel-like materials, built to gather up space-junk; which is then shot out into a trajectory to mash into an asteroid out in the belt, WHAM; SLAM; BAM; Walla!
You have a great found object space graffiti piece, maybe the first?
(later to be visited, if we ever get our collective arses out to the belt)</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31642570</id>
	<title>Re:Cube?</title>
	<author>arielCo</author>
	<datestamp>1269684120000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Yeah, mine's at least 160cm x 160cm x 220cm<nobr> <wbr></nobr>;)</htmltext>
<tokenext>Yeah , mine 's at least 160cm x 160cm x 220cm ; )</tokentext>
<sentencetext>Yeah, mine's at least 160cm x 160cm x 220cm ;)</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640128</id>
	<title>now to...</title>
	<author>Anonymous</author>
	<datestamp>1269710160000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>find a way to attach this to stuff already up there, to get it out of the way faster.</p><p>if they could maneuver when up there and attach on its own, maybe one could send up a bunch of them in one go and have them start cleaning the place.</p></htmltext>
<tokenext>find a way to attach this to stuff already up there , to get it out of the way faster.if they could maneuver when up there and attach on its own , maybe one could send up a bunch of them in one go and have them start cleaning the place .</tokentext>
<sentencetext>find a way to attach this to stuff already up there, to get it out of the way faster.if they could maneuver when up there and attach on its own, maybe one could send up a bunch of them in one go and have them start cleaning the place.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31643660</id>
	<title>This sounds familiar...</title>
	<author>Bill\_the\_Engineer</author>
	<datestamp>1269694320000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>It reminds me of <a href="http://www.nasa.gov/mission\_pages/smallsats/nanosaild.html" title="nasa.gov">NASA's Nanosail-D</a> [nasa.gov]</htmltext>
<tokenext>It reminds me of NASA 's Nanosail-D [ nasa.gov ]</tokentext>
<sentencetext>It reminds me of NASA's Nanosail-D [nasa.gov]</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640104</id>
	<title>Companion Cube?</title>
	<author>Bugamn</author>
	<datestamp>1269710040000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext>This Weighted Companion Cube will accompany the satellites through space.
Aparture Science is sure this will reduce the number of insane satellites in orbit.</htmltext>
<tokenext>This Weighted Companion Cube will accompany the satellites through space .
Aparture Science is sure this will reduce the number of insane satellites in orbit .</tokentext>
<sentencetext>This Weighted Companion Cube will accompany the satellites through space.
Aparture Science is sure this will reduce the number of insane satellites in orbit.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639878</id>
	<title>Re:Is 25 sq m big enough?</title>
	<author>sjames</author>
	<datestamp>1269708480000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>3</modscore>
	<htmltext><p>Yes. 25 m^2 is a good bit of surface area. It's not going to stop these things in an instant, but it would certainly make their orbits decay much sooner.</p></htmltext>
<tokenext>Yes .
25 m ^ 2 is a good bit of surface area .
It 's not going to stop these things in an instant , but it would certainly make their orbits decay much sooner .</tokentext>
<sentencetext>Yes.
25 m^2 is a good bit of surface area.
It's not going to stop these things in an instant, but it would certainly make their orbits decay much sooner.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639746</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639682</id>
	<title>Tiny cube</title>
	<author>Anonymous</author>
	<datestamp>1269707040000</datestamp>
	<modclass>Funny</modclass>
	<modscore>5</modscore>
	<htmltext><p>Gah!<br>Am I the only one who read that as "Time Cube Drags Space Debris From Orbit"? Slashdot ows me a new monitor. This one's all covered in coffee now...</p></htmltext>
<tokenext>Gah ! Am I the only one who read that as " Time Cube Drags Space Debris From Orbit " ?
Slashdot ows me a new monitor .
This one 's all covered in coffee now.. .</tokentext>
<sentencetext>Gah!Am I the only one who read that as "Time Cube Drags Space Debris From Orbit"?
Slashdot ows me a new monitor.
This one's all covered in coffee now...</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639832</id>
	<title>A sail?</title>
	<author>Anonymous</author>
	<datestamp>1269708120000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext><p><div class="quote"><p>Residual air molecules still present in the spacecraft's low-Earth orbit will catch the sheet and pull the object out of the sky much faster than is normal.</p></div><p>When I was younger, we called this "a parachute".</p></div>
	</htmltext>
<tokenext>Residual air molecules still present in the spacecraft 's low-Earth orbit will catch the sheet and pull the object out of the sky much faster than is normal.When I was younger , we called this " a parachute " .</tokentext>
<sentencetext>Residual air molecules still present in the spacecraft's low-Earth orbit will catch the sheet and pull the object out of the sky much faster than is normal.When I was younger, we called this "a parachute".
	</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640058</id>
	<title>Re:Cube?</title>
	<author>houghi</author>
	<datestamp>1269709740000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>The last should have been 10 inches and was rounded up. So it is actually 10x10x10.</p></htmltext>
<tokenext>The last should have been 10 inches and was rounded up .
So it is actually 10x10x10 .</tokentext>
<sentencetext>The last should have been 10 inches and was rounded up.
So it is actually 10x10x10.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639836</id>
	<title>The Allspark</title>
	<author>Walter White</author>
	<datestamp>1269708120000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I just watched Transformers last night so I <i>know</i> where this idea came from!</p></htmltext>
<tokenext>I just watched Transformers last night so I know where this idea came from !</tokentext>
<sentencetext>I just watched Transformers last night so I know where this idea came from!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31644320</id>
	<title>Re:Tiny cube</title>
	<author>ZirconCode</author>
	<datestamp>1269701520000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>RTFA It says tiny cube and space,
It's most definitely talking about the Ark!</htmltext>
<tokenext>RTFA It says tiny cube and space , It 's most definitely talking about the Ark !</tokentext>
<sentencetext>RTFA It says tiny cube and space,
It's most definitely talking about the Ark!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639682</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640000</id>
	<title>Re:Unfurled once it reaches orbit?</title>
	<author>Low Ranked Craig</author>
	<datestamp>1269709380000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I understand the mechanism - it's very straightforward.  This is the quote: "It incorporates within its tiny frame a polymer sheet that is folded for launch to be unfurled once in space."</p><p>My bad for taking the article at face value.  I think the New Scientist article is better: <a href="http://www.newscientist.com/article/dn18705-nanosatellite-sets-sail-to-tackle-space-junk.html" title="newscientist.com">http://www.newscientist.com/article/dn18705-nanosatellite-sets-sail-to-tackle-space-junk.html</a> [newscientist.com]  It even tell you how big the sail is...</p></div>
	</htmltext>
<tokenext>I understand the mechanism - it 's very straightforward .
This is the quote : " It incorporates within its tiny frame a polymer sheet that is folded for launch to be unfurled once in space .
" My bad for taking the article at face value .
I think the New Scientist article is better : http : //www.newscientist.com/article/dn18705-nanosatellite-sets-sail-to-tackle-space-junk.html [ newscientist.com ] It even tell you how big the sail is.. .</tokentext>
<sentencetext>I understand the mechanism - it's very straightforward.
This is the quote: "It incorporates within its tiny frame a polymer sheet that is folded for launch to be unfurled once in space.
"My bad for taking the article at face value.
I think the New Scientist article is better: http://www.newscientist.com/article/dn18705-nanosatellite-sets-sail-to-tackle-space-junk.html [newscientist.com]  It even tell you how big the sail is...
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639712</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640014</id>
	<title>Re:Cube?</title>
	<author>Anonymous</author>
	<datestamp>1269709440000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I don't know, "Rectangular Prism-Sat" just doesn't have the same ring to it.</p><p>And cubesat seems to at least get the idea across.</p></htmltext>
<tokenext>I do n't know , " Rectangular Prism-Sat " just does n't have the same ring to it.And cubesat seems to at least get the idea across .</tokentext>
<sentencetext>I don't know, "Rectangular Prism-Sat" just doesn't have the same ring to it.And cubesat seems to at least get the idea across.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31641140</id>
	<title>Re:Cube?</title>
	<author>gmuslera</author>
	<datestamp>1269716220000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext>The one measured there already assimilated 2 more of its kind.</htmltext>
<tokenext>The one measured there already assimilated 2 more of its kind .</tokentext>
<sentencetext>The one measured there already assimilated 2 more of its kind.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31642704</id>
	<title>Re:Cube?</title>
	<author>B Nesson</author>
	<datestamp>1269684960000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext>Man, you guys must <i>hate</i> ice cube trays.</htmltext>
<tokenext>Man , you guys must hate ice cube trays .</tokentext>
<sentencetext>Man, you guys must hate ice cube trays.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639808</id>
	<title>Re:Unfurled once it reaches orbit?</title>
	<author>krou</author>
	<datestamp>1269707940000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I didn't see where in the article it said that it opens once it reaches orbit. My understanding was that they can instruct the device remotely. All they say is that the polymer sheet 'is folded for launch to be unfurled once in space'. Also, later on:<blockquote><div><p>CubeSail will endeavour to demonstrate this "propellantless propulsion" by trying to shift the path it takes across the surface of the Earth by just a few degrees over the course of a year<nobr> <wbr></nobr>... Once its mission is complete, <b>CubeSail will be instructed to take itself out of orbit.</b></p></div> </blockquote></div>
	</htmltext>
<tokenext>I did n't see where in the article it said that it opens once it reaches orbit .
My understanding was that they can instruct the device remotely .
All they say is that the polymer sheet 'is folded for launch to be unfurled once in space' .
Also , later on : CubeSail will endeavour to demonstrate this " propellantless propulsion " by trying to shift the path it takes across the surface of the Earth by just a few degrees over the course of a year ... Once its mission is complete , CubeSail will be instructed to take itself out of orbit .</tokentext>
<sentencetext>I didn't see where in the article it said that it opens once it reaches orbit.
My understanding was that they can instruct the device remotely.
All they say is that the polymer sheet 'is folded for launch to be unfurled once in space'.
Also, later on:CubeSail will endeavour to demonstrate this "propellantless propulsion" by trying to shift the path it takes across the surface of the Earth by just a few degrees over the course of a year ... Once its mission is complete, CubeSail will be instructed to take itself out of orbit. 
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639712</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640566</id>
	<title>Re:now to...</title>
	<author>nschubach</author>
	<datestamp>1269712440000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I thought that's what this was at first.  I thought, "Finally, someone is going to clean up!"</p><p>Then I finished reading the summary.</p><p>So why is it so hard to send something up to even smack this stuff out of orbit?  I mean, the military apparently tracks all this junk floating around up there and it's all so small it would burn up on re-entry.  So why not send up such a small autonomous craft to find and redirect such trash to get it out of there?  It could even be something as simple as a small space plow.</p></htmltext>
<tokenext>I thought that 's what this was at first .
I thought , " Finally , someone is going to clean up !
" Then I finished reading the summary.So why is it so hard to send something up to even smack this stuff out of orbit ?
I mean , the military apparently tracks all this junk floating around up there and it 's all so small it would burn up on re-entry .
So why not send up such a small autonomous craft to find and redirect such trash to get it out of there ?
It could even be something as simple as a small space plow .</tokentext>
<sentencetext>I thought that's what this was at first.
I thought, "Finally, someone is going to clean up!
"Then I finished reading the summary.So why is it so hard to send something up to even smack this stuff out of orbit?
I mean, the military apparently tracks all this junk floating around up there and it's all so small it would burn up on re-entry.
So why not send up such a small autonomous craft to find and redirect such trash to get it out of there?
It could even be something as simple as a small space plow.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640128</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639938</id>
	<title>Re:Cube?</title>
	<author>marcansoft</author>
	<datestamp>1269708960000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>4</modscore>
	<htmltext><p>Sounds like it's a CubeSat, a standardized tiny satellite that can be launched in large groups (relatively) cheaply. CubeSats are nominally 10x10x10, but you can have double width and triple width versions.</p></htmltext>
<tokenext>Sounds like it 's a CubeSat , a standardized tiny satellite that can be launched in large groups ( relatively ) cheaply .
CubeSats are nominally 10x10x10 , but you can have double width and triple width versions .</tokentext>
<sentencetext>Sounds like it's a CubeSat, a standardized tiny satellite that can be launched in large groups (relatively) cheaply.
CubeSats are nominally 10x10x10, but you can have double width and triple width versions.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31639818</parent>
</comment>
<thread>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#thread_10_03_27_1355226_11</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640172
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</commentlist>
</thread>
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	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#thread_10_03_27_1355226_3</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640014
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	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#thread_10_03_27_1355226_15</id>
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	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#thread_10_03_27_1355226_12</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31644320
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</commentlist>
</thread>
<thread>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#thread_10_03_27_1355226_16</id>
	<commentlist>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment10_03_27_1355226.31640062
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</commentlist>
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