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	<title>Helian Unbound &#187; Interstellar Travel</title>
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	<link>http://helian.net/blog</link>
	<description>The world as I see it</description>
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		<title>More on E. O. Wilson&#8217;s &#8220;The Social Conquest of Earth&#8221;:  Let the Kerfluffles Begin!</title>
		<link>http://helian.net/blog/2012/04/15/morality/more-on-e-o-wilsons-the-social-conquest-of-earth-let-the-kerfluffles-begin/</link>
		<comments>http://helian.net/blog/2012/04/15/morality/more-on-e-o-wilsons-the-social-conquest-of-earth-let-the-kerfluffles-begin/#comments</comments>
		<pubDate>Sun, 15 Apr 2012 19:21:36 +0000</pubDate>
		<dc:creator>Helian</dc:creator>
				<category><![CDATA[Anthropology]]></category>
		<category><![CDATA[Ethics]]></category>
		<category><![CDATA[Evolution]]></category>
		<category><![CDATA[Evolutionary psychology]]></category>
		<category><![CDATA[Extraterrestrial life]]></category>
		<category><![CDATA[Good and Evil]]></category>
		<category><![CDATA[Group Selection]]></category>
		<category><![CDATA[Human nature]]></category>
		<category><![CDATA[Interstellar Travel]]></category>
		<category><![CDATA[Morality]]></category>
		<category><![CDATA[Space travel]]></category>

		<guid isPermaLink="false">http://helian.net/blog/?p=2989</guid>
		<description><![CDATA[Group selection isn&#8217;t the only hornet&#8217;s nest E. O. Wilson poked a stick into in his latest book. The interstellar travel fans at the Tau Zero Foundation are bound to take exception to this: The same cosmic myopia exists today a fortiori in the dreams of colonizing other star systems. It is an expecially dangerous [...]]]></description>
			<content:encoded><![CDATA[<p>Group selection isn&#8217;t the only hornet&#8217;s nest E. O. Wilson poked a stick into in his latest book. The interstellar travel fans at the <a href="http://www.tauzero.aero/#">Tau Zero Foundation</a> are bound to take exception to this:</p>
<blockquote><p>The same cosmic myopia exists today a fortiori in the dreams of colonizing other star systems. It is an expecially dangerous delusion if we see emigration into space as a solution to be taken when we have used up this planet.</p></blockquote>
<p>and,</p>
<blockquote><p>Another principle that I believe can be justified by scientific evidence so far is that nobody is going to emigrate from this planet, not ever.</p></blockquote>
<p>In my humble opinion, Wilson is wrong about interstellar travel.  I hereby predict that we will colonize planets in other star systems.  Our survival depends on it, and our species has a strong inclination to survive.  I suspect his opinion is motivated less by a sober assessment of the technological possibility of interstellar travel than by ideological concerns about the environment.  For example,</p>
<blockquote><p>Surely one moral precept we can agree on is to stop destroying our birthplace, the only home humanity will ever have.  The evidence for climate warming, with industrial pollution as the principle cause, is now overwhelming.</p></blockquote>
<p>I suspect a certain rather irascible <a href="http://motls.blogspot.com/">Czech physicist</a> may take exception to that comment.  In any case, while I admit to having a personal preference that the planet not be destroyed, but I would certainly not presume to elevate such idiosyncratic whims to the level of a &#8220;moral precept.&#8221;  Here, like so many other modern thinkers who should know better, Wilson is treating moral precepts as objective things.  In this case, he is suggesting that not destroying the planet can be legitimized as a &#8220;good-in-itself&#8221; by virtue of everyone agreeing on it.  Otherwise, his comment becomes pointless.  He probably wouldn&#8217;t agree, because he writes elsewhere,</p>
<blockquote><p>There is a principle to be learned by studying the biological origins of moral reasoning&#8230; If such greater understanding amounts to the &#8220;moral relativism so fervently despised by the doctrinally righteous, so be it.</p></blockquote>
<p>I can certainly sympathize with Wilson&#8217;s aversion to the doctrinally righteous or, as I would call them, the pathologically pious.  However, virtually in the same breath, he falls back into the same old fallacy, writing,</p>
<blockquote><p>It is that outside the clearest ethical precepts, such as the condemnation of slavery, child abuse, and genocide, which all will agree should be opposed everywhere without exception, there is a larger gray domain inherently difficult to navigate.</p></blockquote>
<p>Here we have the familiar &#8220;50 billion flies can&#8217;t be wrong&#8221; justification of the legitimacy of moral precepts.  Wilson&#8217;s comment begs the question of what qualitative difference exists between &#8220;clear ethical precepts,&#8221; and all the rest that lie in the gray area.  If, as he asserts, the origins of moral reasoning are biological or, in a word, evolved, in what way is it at all reasonable to claim that condemnation of slavery, child abuse, and genocide can have an objective existence as ethical precepts at all?  Presumably, the thought that there even was such a thing as &#8220;genocide&#8221; never occurred to those of our forebears among whom the &#8220;biological origins of moral reasoning&#8221; evolved.   Wilson&#8217;s implicit acceptance of an objective morality is evident elsewhere in the book.  For example,</p>
<blockquote><p>For scientific as well as for moral reasons, we should learn to promote human biological diversity for its own sake insted of using it to justify prejudice and conflict.</p></blockquote>
<p>On what, exactly, are we to base the legitimacy of these &#8220;moral reasons&#8221;?  In what sense was the &#8220;promotion of human biological diversity&#8221; relevant to the australopithecines?  Wilson has some other comments on the origin of moral precepts that are bound to make the detractors of group selection see red, such as,</p>
<blockquote><p>An unavoidable and perpetual war exists between honor, virtue, and duty, the products of group selection, on one side, and selfishness, cowardice, and hypocrisy, the products of individual selection, on the other side.</p></blockquote>
<p>At the risk of committing <em>lèse-majesté</em>, I must admit that I find such sweeping generalizations somewhat over the top.  Turning to less controversial subjects, Wilson mentions the concept of a superorganism in several places, such as,</p>
<blockquote><p>The queen and her offspring are often called superorganisms&#8230;</p></blockquote>
<blockquote><p>This circumstance lends credence to the view that the colony can be viewed as an individual organism or, more precisely, an individual superorganism.</p></blockquote>
<p>and,</p>
<blockquote><p>In this sense, I have argued, the primitive colony is a superorganism.</p></blockquote>
<p>It would have been nice if Wilson had mentioned the great South African, <a href="http://en.wikipedia.org/wiki/Eug%C3%A8ne_Marais">Eugene Marais</a>, who first proposed the idea of a superorganism in the context of his studies of termites, in the course of these discussions.  Readers of today will find some remarkably modern insights in books such as <em>The Soul of the White Ant</em> and <em>The Soul of the Ape</em>.  To say Marais was ahead of his time is an understatement.</p>
<p>In any case, I hope all the controversy Wilson&#8217;s latest is bound to inspire won&#8217;t have the unfortunate effect of toppling him from his exalted state as the &#8220;father of evolutionary psychology.&#8221;  The field has enough unpersons as it is.  Regardless, some rewriting of textbooks will likely be in order.  For example, in David Buss&#8217; <em>Evolutionary Psychology</em> he refers to the &#8220;bulk of the theoretical tools&#8221; in Wilson&#8217;s <em>Sociobiology</em> as &#8220;inclusive fitness theory, parental investment theory, parent-offspring conflict theory, and reciprocal altuism theory.&#8221;  Might it not, perhaps, be best, to avoid &#8220;confusing&#8221; young undergraduates, to just let Wilson&#8217;s group selection <em>faux pas</em> pass in silence?  If not, and his head must indeed roll, I hereby nominate Charles Darwin as the new &#8220;father of evolutionary psychology.&#8221;  At least he will be a safe choice.</p>
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		<title>Space Colonization and Stephen Hawking</title>
		<link>http://helian.net/blog/2011/11/21/morality/space-colonization-and-stephen-hawking/</link>
		<comments>http://helian.net/blog/2011/11/21/morality/space-colonization-and-stephen-hawking/#comments</comments>
		<pubDate>Tue, 22 Nov 2011 02:47:20 +0000</pubDate>
		<dc:creator>Helian</dc:creator>
				<category><![CDATA[Evolution]]></category>
		<category><![CDATA[Evolutionary psychology]]></category>
		<category><![CDATA[Good and Evil]]></category>
		<category><![CDATA[Human nature]]></category>
		<category><![CDATA[Interstellar Travel]]></category>
		<category><![CDATA[Morality]]></category>
		<category><![CDATA[Philosophy]]></category>
		<category><![CDATA[Psychology]]></category>
		<category><![CDATA[Science]]></category>
		<category><![CDATA[Space travel]]></category>
		<category><![CDATA[Technology]]></category>

		<guid isPermaLink="false">http://helian.net/blog/?p=2710</guid>
		<description><![CDATA[Stephen Hawking is in the news again as an advocate for space colonization.  He raised the issue in a recent interview with the Canadian Press, and will apparently include it as a theme of his new TV series, Brave New World with Stephen Hawking, which debuts on Discovery World HD on Saturday.  There are a number of [...]]]></description>
			<content:encoded><![CDATA[<p>Stephen Hawking is in the news again as an advocate for space colonization.  He raised the issue in a recent<a href="http://www.winnipegfreepress.com/canada/breakingnews/human-survival-depends-on-space-exploration-says-stephen-hawking-134135238.html"> interview with the Canadian Press</a>, and will apparently include it as a theme of his new TV series, Brave New World with Stephen Hawking, which debuts on Discovery World HD on Saturday.  There are a number of interesting aspects to the story this time around.  One that most people won&#8217;t even notice is Hawking&#8217;s reference to human nature.  Here&#8217;s what he had to say.</p>
<blockquote><p>Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment for good or ill. But our genetic code still carries the selfish and aggressive instincts that were of survival advantage in the past. It will be difficult enough to avoid disaster in the next hundred years, let alone the next thousand or million.</p></blockquote>
<p>The fact that Hawking can matter-of-factly assert something like that about innate behavior in humans as if it were a matter of common knowledge speaks volumes about the amazing transformation in public consciousness that&#8217;s taken place in just the last 10 or 15 years.  If he&#8217;d said something like that about &#8220;selfish and aggressive instincts&#8221; 50 years ago, the entire community of experts in the behavioral sciences would have dismissed him as an ignoramus at best, and a fascist and right wing nut case at worst.  It&#8217;s astounding, really.  I&#8217;ve watched this whole story unfold in my lifetime.  It&#8217;s just as stunning as the paradigm shift from an earth-centric to a heliocentric solar system, only this time around, Copernicus and Galileo are unpersons, swept under the rug by an academic and professional community too ashamed of their own past collective imbecility to mention their names.  Look in any textbook on Sociology, Anthropology, or Evolutionary Psychology, and you&#8217;ll see what the sounds of silence look like in black and white.  Aside from a few obscure references, the whole thing is treated as if it never happened.  Be grateful, dear reader.  At last we can say the obvious without being shouted down by the &#8220;experts.&#8221;  There is such a thing as human nature.</p>
<p>Now look at the comments after the story in the Winnipeg Free Press I linked above.  Here are some of them.</p>
<blockquote><p>&#8220;Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.&#8221;  If that is the case, perhaps we don&#8217;t deserve to survive. If we bring destruction to our planet, would it not be in the greater interest to destroy the virus, or simply let it expire, instead of spreading its virulence throughout the galaxy?</p></blockquote>
<blockquote><p>And who would decide who gets to go? Also, &#8220;Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.&#8221; What a stupid thing to say: if we can&#8217;t survive &#8216;lurking&#8217; on planet Earth then who&#8217;s to say humans wouldn&#8217;t ruin things off of planet Earth?</p></blockquote>
<blockquote><p>I will not go through any of this as I will be dead by then and gone to a better place as all those who remain and go through whatever happenings in the Future,will also do!</p></blockquote>
<p>I&#8217;ve written a lot about morality on this blog.  These comments speak to the reasons why getting it right about morality, why understanding its real nature, and why it exists, are important.  All of them are morally loaded.  As is the case with virtually all morally loaded comments, their authors couldn&#8217;t give you a coherent explanation of why they have those opinions.  They just feel that way.  I don&#8217;t doubt that they&#8217;re entirely sincere about what they say.  The genetic programming that manifests itself as human moral behavior evolved many millennia ago in creatures who couldn&#8217;t conceive of themselves as members of a worldwide species, or imagine travel into space.  What these comments demonstrate is something that&#8217;s really been obvious for a long time.  In the environment that now exists, vastly different as it is from the one in which our moral predispositions evolved, they can manifest themselves in ways that are, by any reasonable definition of the word, pathological.  In other words, they can manifest themselves in ways that no longer promote our survival, but rather the opposite.</p>
<p>As can be seen from the first comment, for example, thanks to our expanded consciousness of the world we live in, we can conceive of such an entity as &#8220;all mankind.&#8221;  Our moral programming predisposes us to categorize our fellow creatures into ingroups and outgroups.  In this case, &#8220;all mankind&#8221; has become an outgroup or, as the commenter puts it, a &#8220;virus.&#8221;  The demise, not only of the individual commenter, but of all mankind, has become a positive Good.  More or less the same thing can be said about the second comment.  This commenter apparently believes that it would be better for humans to become extinct than to &#8220;mess things up.&#8221;  For whom?</p>
<p>As for the third commenter, survival in this world is unimportant to him because he believes in eternal survival in a future imaginary world under the proprietership of an imaginary supernatural being.  It is unlikely that this attitude is more conducive to our real genetic survival than those of the first two commenters.  I submit that if these commenters had an accurate knowledge of the real nature of human morality in the first place, and were free of delusions about supernatural beings in the second, the tone of their comments would be rather different.</p>
<p>And what of my opinion on the matter?  In my opinion, morality is the manifestation of genetically programmed traits that evolved because they happened to promote our survival.  No doubt because I understand morality in this way, I have a subjective emotional tendency to perceive the Good as my own genetic survival, the survival of my species, and the survival of life as it has evolved on earth, not necessarily in that order.  Objectively, my version of the Good is no more legitimate or objectively valid that those of the three commenters.  In some sense, you might say it&#8217;s just a whim.  I do, however, think that my subjective feelings on the matter are reasonable.  I want to pursue as a &#8220;purpose&#8221; that which the evolution of morality happened to promote; survival.  It seems to me that an evolved, conscious biological entity that doesn&#8217;t want to survive is dysfunctional &#8211; it is sick.  I would find the realization that I am sick and dysfunctional distasteful.  Therefore, I choose to survive.  In fact, I am quite passionate about it.  I believe that, if others finally grasp the truth about what morality really is, they are likely to share my point of view.  If we agree, then we can help each other.  That is why I write about it.</p>
<p>By all means, then, let us colonize space, and not just our solar system, but the stars.  We can start now.  We lack sources of energy capable of carrying humans to even the nearest stars, but we can send life, even if only single-celled life.  Let us begin.</p>
<p><a href="http://helian.net/blog/wp-content/uploads/2011/11/Andromeda.jpg"><img class="alignleft size-full wp-image-2711" title="Andromeda" src="http://helian.net/blog/wp-content/uploads/2011/11/Andromeda.jpg" alt="" width="550" height="366" /></a></p>
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		<title>DARPA&#8217;s &#8220;100 Year Starship&#8221; and Planetary Colonization</title>
		<link>http://helian.net/blog/2010/11/03/morality/darpas-100-year-starship-and-planetary-colonization/</link>
		<comments>http://helian.net/blog/2010/11/03/morality/darpas-100-year-starship-and-planetary-colonization/#comments</comments>
		<pubDate>Wed, 03 Nov 2010 16:42:22 +0000</pubDate>
		<dc:creator>Helian</dc:creator>
				<category><![CDATA[Evolution]]></category>
		<category><![CDATA[Interstellar Travel]]></category>
		<category><![CDATA[Morality]]></category>
		<category><![CDATA[Technology]]></category>

		<guid isPermaLink="false">http://helian.net/blog/?p=2275</guid>
		<description><![CDATA[DARPA seems to have its priorities straight when it comes to space exploration.  The agency is funding what it calls the &#8220;100 Year Starship&#8221; program to study novel propulsion systems with the eventual goal of colonizing space.    Pete Worden, Director of NASA&#8217;s Ames Center, suggests that Mars might be colonized by 2030 via one-way missions.  It&#8217;s an obvious [...]]]></description>
			<content:encoded><![CDATA[<p>DARPA seems to have its priorities straight when it comes to space exploration.  The agency is funding what it calls the &#8220;<a href="http://spacefellowship.com/news/art23300/nasa-and-darpa-announce-a-100-year-starship-.html">100 Year Starship</a>&#8221; program to study novel propulsion systems with the eventual goal of colonizing space.    Pete Worden, Director of NASA&#8217;s Ames Center, suggests that Mars might be colonized by 2030 via one-way missions.  It&#8217;s an obvious choice, really.  There&#8217;s little point in sending humans to Mars unless they&#8217;re going to stay there, and, at least from my point of view, establishing a permanent presence on the red planet is a good idea.  My point of view is based on the conclusion that, if there&#8217;s really anything that we &#8220;ought&#8221; to do, it&#8217;s survive.  Everything about us that makes us what we are evolved because it promoted our survival, so it seems that survival is a reasonable goal.  There&#8217;s no absolutely legitimate reason why we should survive, but, if we don&#8217;t, it would seem to indicate that we are a dysfunctional species, and I find that thought unpleasant.  There, in a nutshell, is my rationale for making human survival my number one priority. </p>
<p>If we seek to survive then, when it comes to planets, it would be unwise to put all of our eggs in one basket.  Steven Hawking apparently agrees with me on this, as can be seen <a href="http://www.firstthings.com/blogs/secondhandsmoke/2010/08/09/stephen-hawking-believes-in-saving-exceptional-humans-through-space-colonization/">here</a> and <a href="http://www.myfoxnepa.com/dpps/news/stephen-hawking-abandon-the-earth-dpgoha-20100809-fc_9088678">here</a>. In his words,</p>
<blockquote><p>It will be difficult enough to avoid disaster on planet Earth in the next hundred years, let alone the next thousand, or million. The human race shouldn&#8217;t have all its eggs in one basket, or on one planet. Let&#8217;s hope we can avoid dropping the basket until we have spread the load.</p></blockquote>
<p>Not unexpectedly in this hypermoralistic age, morality is being dragged into the debate.  The usual &#8220;ethics experts&#8221; are ringing their hands about how and under what circumstances we have a &#8220;right&#8221; to colonize space, and what we must do to avoid being &#8220;immoral&#8221; in the process.  Related discussions can be found <a href="http://bgnews.com/opinion/moral-and-technical-complications-will-limit-the-possibilities-of-space-colonization/">here</a> and <a href="http://www.slate.com/id/2093579/">here</a>.  Apparently it never occurs to people who raise such issues that human beings make moral judgments and are able to conceive of such things as &#8220;rights&#8221; only because of the existence of emotional wiring in our brains that evolved because it promoted our survival and that of our prehuman ancestors.  Since it evolved at times and under circumstances that were apparently uninfluenced by what was happening on other planets, morality and &#8220;rights&#8221; are relevant to the issue only to the extent that they muddy the waters.</p>
<p>Assuming that others agree with me and Dr. Hawking that survival is a desirable goal, then ultimately we must seek to move beyond our own solar system.  Unfortunately there are severe constraints on our ability to send human beings on such long voyages owing to the vast amounts of energy that would be necessary to make interstellar journey&#8217;s within human lifetimes.  For the time being, at least, we must rely on very small vessels that may take a very long time to reach their goals.  Nanotechnology is certainly part of the answer.  Tiny probes might survey the earth-like planets we discover to determine their capacity to support life.  Those found suitable should be seeded with life as soon as possible.  Again, because of energy constraints, it may only be possible to send one-celled or very simple life forms at first.  They can survive indefinitely long voyages in space, and would be the logical choice to begin seeding other planets.  Self-replicating nano-robots might then be sent capable of building a suitable environment for more complex life forms, including incubators and surrogate parents.  At that point, it would become possible to send more complex life forms, including human beings, in the form of frozen fertilized eggs.  These are some of the things we might consider doing if we consider our survival important.</p>
<p>Of course, any number of the pathologically pious among us might find what I&#8217;ve written above grossly immoral.  The fact remains that there is no legitimate basis for such a judgment.  Morality exists because it promoted our survival.  There can be nothing more immoral than failing to survive.</p>
<div id="attachment_2277" class="wp-caption alignleft" style="width: 460px"><a href="http://helian.net/blog/wp-content/uploads/2010/11/Starship.jpg"><img class="size-medium wp-image-2277" title="Starship" src="http://helian.net/blog/wp-content/uploads/2010/11/Starship-300x217.jpg" alt="" width="450" height="325" /></a><p class="wp-caption-text">The Daedalus Starship</p></div>
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		<title>Earthlike Worlds&#8230;</title>
		<link>http://helian.net/blog/2010/07/25/morality/earthlike-worlds/</link>
		<comments>http://helian.net/blog/2010/07/25/morality/earthlike-worlds/#comments</comments>
		<pubDate>Sun, 25 Jul 2010 15:00:45 +0000</pubDate>
		<dc:creator>Helian</dc:creator>
				<category><![CDATA[Extraterrestrial life]]></category>
		<category><![CDATA[Interstellar Travel]]></category>
		<category><![CDATA[Morality]]></category>
		<category><![CDATA[Science]]></category>
		<category><![CDATA[Space travel]]></category>

		<guid isPermaLink="false">http://helian.net/blog/?p=1745</guid>
		<description><![CDATA[The Kepler Mission has now identified more than 700 suspected new planets, some of them earthlike, in interstellar space.  As Insty would say, &#8220;faster please.&#8221; We should be searching for life forms on earth that are most likely to survive on these worlds and working on the technology to get them there as quickly as [...]]]></description>
			<content:encoded><![CDATA[<p>The <a href="http://kepler.nasa.gov/">Kepler Mission</a> has now identified more than 700 suspected new planets, some of them earthlike, in interstellar space.  As Insty would say, &#8220;<a href="http://www.foxnews.com/scitech/2010/07/25/nasas-deep-space-camera-locates-host-earths/">faster please</a>.&#8221; We should be searching for life forms on earth that are most likely to survive on these worlds and working on the technology to get them there as quickly as possible. At first these will be limited to single celled or simple multi-celled species that are small enough to accelerate to the speeds necessary for interstellar travel. While we&#8217;re doing that, we can work on the nano-technology required to self-assemble human nurseries on alien worlds capable of nurturing single human cells through birth to adulthood. The energy cost of sending fully developed human beings is prohibitive, and probably impossible at the moment. However, the technology required to send single living cells is within our grasp.</p>
<p>Every other challenge we face and all the great political, religious, and ideological issues that have captured our imaginations and whipped us into self-destructive frenzies since the dawn of human existence pale in significance compared to the ultimate challenge of carrying life into interstellar space.  Unless we meet the challenge, all our pompous babbling about morality and ethics will be as meaningless as the life of a soap bubble.  There can be nothing more immoral than failing to survive.</p>
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		<title>Solar Sails and Interstellar Colonization</title>
		<link>http://helian.net/blog/2010/06/13/space-travel/solar-sails-and-interstellar-colonization/</link>
		<comments>http://helian.net/blog/2010/06/13/space-travel/solar-sails-and-interstellar-colonization/#comments</comments>
		<pubDate>Sun, 13 Jun 2010 14:44:12 +0000</pubDate>
		<dc:creator>Helian</dc:creator>
				<category><![CDATA[Interstellar Travel]]></category>
		<category><![CDATA[Space travel]]></category>
		<category><![CDATA[Transhumanism]]></category>

		<guid isPermaLink="false">http://helian.net/blog/?p=1587</guid>
		<description><![CDATA[The Japanese spacecraft Icarus has apparently spread its solar sail, and we will soon see whether the novel propulsion system, familiar in the realm of science fiction, will also work in practice. There&#8217;s no question about the fact that photons from the sun will exert pressure on the sail. The goal of the mission is [...]]]></description>
			<content:encoded><![CDATA[<p>The Japanese spacecraft Icarus has apparently spread its <a href="http://www.space.com/missionlaunches/japan-spacecraft-deploys-solar-sail-100611.html">solar sail</a>, and we will soon see whether the novel propulsion system, familiar in the realm of <a href="http://starwars.wikia.com/wiki/Punworcca_116-class_interstellar_sloop">science fiction</a>, will also work in practice. There&#8217;s no question about the fact that photons from the sun will exert pressure on the sail. The goal of the mission is to determine whether the resulting acceleration can be controlled for accurate navigation. The efficiency of thin film solar panels embedded in the sail will also be measured to determine their potential for powering an auxiliary ion engine that might be used on future flights for more precise navigational control. Such an engine powers the <a href="http://dawn.jpl.nasa.gov/">NASA Dawn</a> asteroid exploration probe, which recently established a new speed change record of 9600 miles per hour and counting, using only 363 pounds of xenon propellant in the process.</p>
<p>Sail technology is not necessarily limited to the vicinity of the sun. The photons required for propulsion might also be supplied by ground based lasers or masers to enable sail-based interstellar travel. (Related links are <a href="http://www.transorbital.net/Library/D001_AxA.html">here</a>, <a href="http://www.niac.usra.edu/files/studies/final_report/333Christensen.pdf">here</a> and <a href="http://www.niac.usra.edu/files/studies/final_report/597Kare.pdf">here</a>.)  Unfortunately, human travel using such systems is out of the question for the time being because of the inordinate amount of energy that would be needed to drive a manned spacecraft to the speeds required to cross interstellar distances within a human lifetime. However, it may be feasible to accelerate very small payloads of a few tens of grams to the speeds necessary to cross interstellar distances in times on the order of decades and decelerate them at their targets. Given continued advances in nanotechnology, useful scientific instruments of sufficiently small size might be developed to fit in such tiny craft.   More importantly, life in the form of spores or bacteria might be sent to seed promising planets. Given the very real possiblity that we will exterminate ourselves here on earth, and that survival trumps any other purpose or goal that we might reasonably set for ourselves, it seems to me that this should be one of our highest priorities.  We are related to every other life form on the planet, but are the only species capable of preserving that life indefinitely.  We should do so. </p>
<p>Given the <a href="https://webspace.utexas.edu/cokerwr/www/index.html/stravellers.shtml">energy limitations</a> noted above, it will probably be impractical to send spacecraft large enough to support a <a href="http://www.tauzero.aero/">human crew</a> over interstellar distances any time in the foreseeable future, barring some <a href="http://www.centauri-dreams.org/">unforeseen advance</a> in an enabling technology.  However, All the information necessary to assemble a human being is contained in the nucleus of every cell in our bodies.  It may prove more practical to send self-replicating nano-robots, programmed to eventually build the larger machines necessary to create dwellings, begin agriculture, etc., and finally build artificial wombs and &#8221;nannies&#8221; of human size.  At that point, eggs and sperm, which it would be much more practical to send over interstellar distances in a reasonable time, could be combined to form a human population.  Fanciful?  Certainly, but it sounds better, to me at least, than waiting around for our extinction, which is inveitable and will probably occur sooner rather than later if we are foolhardy enough to remain on one planet.</p>
<p><a href="http://helian.net/blog/wp-content/uploads/2010/06/Ikaros.jpg"><img class="alignleft size-full wp-image-1592" title="Ikaros" src="http://helian.net/blog/wp-content/uploads/2010/06/Ikaros.jpg" alt="" width="610" height="580" /></a></p>
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