Abstract
In the depths of space, how will groups and individuals interact? What will the dynamics be when law enforcement is in pursuit of criminals, or when powerful groups try to constrain the activities of lesser ones? Using some very general assumptions, it is possible to paint a picture of how these dynamics could play out. The most likely options for competing groups are either an exodus at a significant fraction of the speed of light, in order to escape their pursuers, or a mass expansion to claim as many resources as possible. Such a mass expansion could also be used to preemptively prevent escape. This paper assumes that future humans are capable of ‘recursive manufacturing’ (expanding their manufacturing base to make full use of any new resources) and that they can copy and co-opt natural processes, including some of the mental processes. Then both expansion and escape will be relatively easy for any reasonably-sized space-faring group. The ultimate shape of human society in space may well depend on which groups expand first, and under which circumstances.
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Notes
- 1.
We will assume here that human civilization doesn’t collapse in the meantime!
- 2.
This will be far from the current world, when a picture can get around the world in seconds and a military strike in a few hours. This need not make centralised authority impossible, but it does mean such an authority needs to allow local responses without consultation to the centre.
- 3.
Since the acceleration and deceleration are the key costs, with the middle section of the trip just being effortless coasting.
- 4.
On the cosmic scale, at least.
- 5.
This list has some similarities to the work of Albert O. Hirschman, who analysed conflicts in organisations or societies in terms of “exit” (hiding or fleeing), “voice” (negotiating an agreement) or “loyalty” (staying put and accepting the status quo) (Hirschman 1970) One interesting aspect is that if exit is easy, the scope for voice is reduced—dissenters or resource-rich parties will preferentially escape, leaving a more loyal core depleted of reformers. In fact, some powers might encourage exit as long as they do not have any reason to fear subsequent retaliation by the exiles. However, some of the technologies discussed in this chapter, such as recursive manufacturing, do make interstellar exiles potentially dangerous.
- 6.
To pick an example, if group B remained confined to a solar system while group A claimed the galaxy, then group A could eventually crash half a dozen stars into group B’s system without denting their own resources. More likely, they could saturate group B’s domain with fast moving projectiles or destructive energy pulses.
- 7.
We will lay aside the possibility of faster than light expansion, using some as yet unknown loophole in physics. This would enable both escape anywhere, but also presumably catching anyone. It also makes the Fermi paradox far more problematic—FTL drives would allow visits from aliens even beyond the cosmic event horizon. In the end, there is very little that can be said about such an unconstrained case, which—according to our current understanding of physics—would permit time travel.
- 8.
See paper Armstrong and Sandberg (2013) for more details on one possible scenario.
- 9.
This is a stronger assumption that recursive manufacturing. Artificial intelligence would be sufficient for recursive manufacturing, but not necessary.
- 10.
The calculation of these efficiencies is where this approach is most vulnerable to small errors: small loses of efficiency mean dramatically more material needed for deceleration. But the total energy requirements are so low that this does not change the main point on the ease of expansion, though this expansion may end up being slightly slower than envisaged here.
- 11.
In fact, the expansion of the universe creates a ‘Hubble drag’ (Peacock 1999; Bertschinger 1995) that slows probes down relative to their destinations. For the most distant of the galaxies—those barely reachable at all—the probes will arrive with practically no velocity. Thus we will also consider a fourth scenario, that of probes launched at 99 %c with no major deceleration capabilities.
- 12.
The initial paper in this project (Armstrong and Sandberg 2013) was focused on the Fermi paradox: the idea was not to plot the future course of a human cosmic civilization, but to illustrate the ease with which alien species could cross the void between galaxies, and thus worsen the Fermi paradox: life could have reached us from many galaxies with ease, so their absence is puzzling.
The Earth is not among the oldest of terrestrial planets. About 75 % of the planets that could have habitable life on them in our Milky Way are older than the sun (Lineweaver et al. 2004). If we look back 5 billion years (a timespan in which its likely that intelligent life could have evolved on Earth-like planets), then 7.69 × 107 galaxies could have reached us at the slow pace of 50 %c, considerably worsening the Fermi paradox.
- 13.
A few million years is a rounding error for most cosmic phenomena.
- 14.
This might be as simple as improved transparency, allowing all groups to spy on each other, or may be the result of new technology, such as applying workable lie detection to leaders of the various factions.
- 15.
Or whole brain emulations.
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Acknowledgments
We are very grateful for comments, support and help from Milan C′irkovic ′, Pedro Ferreira, Eric Drexler, Nick Bostrom, Timothy Clifton, Toby Ord, Robin Hanson, Daniel Dewey, Nick Beckstead, Charles Cockell, Ian Crawford and Levi Leatherberry.
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Armstrong, S., Sandberg, A., ÓhÉigeartaigh, S. (2015). Outrunning the Law: Extraterrestrial Liberty and Universal Colonisation. In: Cockell, C. (eds) The Meaning of Liberty Beyond Earth. Space and Society. Springer, Cham. https://doi.org/10.1007/978-3-319-09567-7_11
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