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We e upon Psalm 15； which stakes a divine claim to other worlds： 〃＇T＇he heavens are the Lord's； but the Earth lath he given to the children of men。〃 Or Plato's retelling of the Greek analogue of Babel—the tale of Otys and Ephialtes。 They were mortals who 〃dared to scale heaven。〃 The gods were faced with a choice。 Should they kill the upstart humans 〃and annihilate ＇their＇ race with thunderbolts〃？ On the one Band； 〃this would be the end of the sacrifices and worship which mien offered〃 the gods and which gods craved。 〃But； on the other hand； the gods could not suffer ＇such＇ insolence to be unrestrained。''
If； in the long term； though； we have no alternative； if our choice really is many worlds or none； we are in need of other sorts of myths of encouragement。 They exist。 Many religions； from Hinduism to Gnostic Christianity to Mormon doctrine； teach that—as impious as it may sound—it is the goal of humans to bee gods。 Or consider a story in the Jewish Talmud left out of the Book of Genesis。 （It is in doubtful accord with the account of the apple； the Tree of Knowledge； the Fall； and the expulsion from Eden。） In the Garden； God tells Eve and Adam that He has intentionally left the Universe unfinished。 It is the responsibility of humans； over countless generations； to participate with God in a 〃glorious〃 experiment—〃 pleting the Creation。〃
The burden of such a responsibility is heavy； especially on so weak and imperfect a species as ours； one with so unhappy a history。 Nothing remotely like 〃pletion〃 can be attempted without vastly more knowledge than we have today。 But perhaps； if our very existence is at stake； we will find ourselves Able to rise to this supreme challenge。
ALTHOUGH HE DID NOT quite use any of the arguments of the preceding chapter； it was Robert Goddard's intuition that 〃the navigation of interplanetary space must be effected to ensure the continuance of the race。〃 Konstantin Tsiolkovsky made a similar judgment：
There are countless planets； like many island Earths 。 。 。 Man occupies one of them。 But why could he not avail himself of others； and of the might of numberless suns？ 。 。 。 When the Sun has exhausted its energy； it would be logical to leave it and look for another； newly kindled； star still in its prime。
This might be done earlier； he suggested； long before the Sun dies； 〃by adventurous souls seeking fresh worlds to conquer。〃
But as I rethink this whole argument； I'm troubled。 Is it too much Buck Rogers？ Does it demand an absurd confidence in future technology？ Does it ignore my own admonitions about human fallibility？ Surely in the short term it's biased against technologically less…developed nations。 Are there no practical alternatives that avoid these pitfalls？
All our self…inflicted environmental problems； all our weapons of mass destruction are products of science and technology。 So； you might say； let's just back off from science and technology。 Let's admit that these tools are simply too hot to handle。 Let's create a simpler society； in which no matter how careless or short…sighted we are； we're incapable of altering the environment on a global or even on a regional scale。 Let's throttle back to a minimal； agriculturally intensive technology； with stringent controls on new knowledge。 An authoritarian theocracy is a tried…and…true way to enforce the controls。
Such a world culture is unstable； though； in the long run if not the short—because of the speed of technological advance。 Human propensities for self…betterment； envy； and petition will always be throbbing subsurface； opportunities for short…term； local advantage will sooner or later be seized。 Unless there are severe constraints on thought and action； in a flash we'll be back to where we are today。 So controlled a society must grant great powers to the elite that does the controlling； inviting flagrant abuse and eventual rebellion。 It's very hard—once we've seen the riches； conveniences； and lifesaving medicines that technology offers—to squelch human inventiveness and acquisitiveness。 And while such a devolution of the global civilization； were it possible； might conceivably address the problem of self…inflicted technological catastrophe； it would also leave us defenseless against eventual asteroidal and etary impacts。
Or you might imagine throttling back much further； back to hunter…gatherer society； where we live off the natural products of the land and abandon even agriculture。 Javelin； digging stick； bow； arrow； and fire would then be technology enough。 But the Earth could support at the very most a few tens of millions of hunter…gatherers。 How could we get down to such low population levels without instigating the very catastrophes we are trying to avoid？ Besides； we hardly know how to live the hunter…gatherer life anymore： We've forgotten their cultures； their skills； their tool…kits。 We've killed off almost all of them； and we've destroyed much of the environment that sustained them。 Except for a tiny remnant of us； we might not be able； even if we gave it high priority； to go back。 And again； even if we could return； we would be helpless before the impact catastrophe that inexorably will e。
The alternatives seem worse than cruel： They are ineffective。 Many of the dangers we face indeed arise from science and technology—but； more fundamentally； because we leave bee powerful without being mensurately wise。 The world…altering powers that technology has delivered into our hands now require a degree of consideration and foresight that has never before been asked of us。
Science cuts two ways； of course； its products can be used for both good and evil。 But there's no turning back from science。 The early warnings about technological dangers also e from science。 The solutions may well require more of us than just a technological fix。 Many will have to bee scientifically literate。 We may have to change institutions and behavior。 But our problems； whatever their origin； cannot be solved apart from science。 The technologies that threaten us and the circumvention of those threats both issue from the same font。 They are racing neck and neck。
In contrast； with human societies on several worlds； our prospects would be far more favorable。 Our portfolio would be diversified。 Our eggs would be； almost literally； in many baskets。 Each society would tend to be proud of the virtues of its world； its planetary engineering； its social conventions； its hereditary predispositions。 Necessarily； cultural differences would be cherished and exaggerated。 This diversity would serve as a tool of survival。
When the off Earth settlements are better able to fend for themselves； they will have every reason to encourage technological advance； openness of spirit； and adventure—even if those left on Earth are obliged to prize caution； fear new knowledge； and institute Draconian social controls。 After the first few self…sustaining munities are established on other worlds； the Earthlings might also be able to relax their strictures and lighten up。 The humans in space would provide those on Earth with real protection against rare but catastrophic collisions by asteroids or ets on rogue trajectories。 Of course； for this very reason； humans in space would hold the upper hand in any serious dispute with those on Earth。
The prospects of such a time contrast provocatively with forecasts that the progress of science and technology is now near some asymptotic limit； that art； literature； and music are never to approach； much less exceed； the heights our species has； on occasion； already touched； and that political life on Earth is about to settle into some rock…stable liberal democratic world government； identified； after Hegel； as 〃the end of history。〃 Such an expansion into space also contrasts with a different but likewise discernible trend in recent times—toward authoritarianism； censorship； ethnic hatred； and a deep suspicion of curiosity and learning。 Instead； I think that； after some debugging； the settlement of the Solar System presages an open…ended era of dazzling advances in science and technology； cultural flowering； and wide…ranging experiments； up there in the sky； in government and social organization。 In more than one respect； exploring the Solar System and homesteading other worlds constitutes the beginning； much more than the end； of history。
IT'S IMPOSSIBLE； for us humans at least； to look into our future； certainly not centuries ahead。 No one has ever done so with any consistency and detail。 I certainly do not imagine that I can。 I have； with some trepidation； gone as far as I have to this point in the book； because we are just recognizing the truly unprecedented challenges brought on by our technology。 These challenges have； I think； occasional straightforward implications； some of which I've tried briefly to lay out。 There are also less straightforward； much longer…term implications about which I'm even less confident。 Nevertheless； I'd like to present them too for your consideration：
Even when our descendants are established on near…Earth asteroids and Mars and the moons of the outer Solar System and the Kuiper et Belt； it still won't be entirely safe。 In the long run； the Sun may generate stupendous X…r