planetary surfaces

During the Stelliferous Era planetary surfaces are uniquely suited for emergent complexity such as life and civilization. Planetary surfaces are by their nature complex, being the interface between planet and planetary atmosphere. Planetary surfaces are moreover a “Goldilocks” zone for energy flows during the Stelliferous Era; energy flows on stars themselves are too great for life, while energy flows in space (in the clouds of gas and dust that surround a star) are too little for life. Planetary surfaces, then, provide “just right” energy flows at the interface of atmospheric gases and the minerals constituting the planet. If emergent complexity is going to arise during the Stelliferous, it is going arise here, hence civilizations begin on planets.

That civilizations begin on planets during the Stelliferous Era has certain consequences. Civilizations originate at the bottom of a gravity well, and if they are to expand beyond a planetary surface, they must reach a level of technological sophistication adequate to lift off from its homeworld a demographically significant proportion of its population of the intelligent organism upon which the civilization supervenes. This is the first and the most significant of the horizons of spacefaring civilization, and the spacefaring horizon that provides the initial overview effect of the civilization’s homeworld.

What this means is that there is thus a natural tendency to planetary endemism among civilizations of the Stelliferous Era. In my posts on planetary constraints I outlined the limitations imposed upon a civilization the development of which is limited to the surface of a planet. These constraints include: 1. the spatial constraint, 2. the temporal constraint, 3. the gravitational constraint, 4. the agrarian constraint, 5. the population constraint, 6. the energy constraint, 7. the material constraint, 8. the ontic constraint, and 9. the endemic constraint. These constraints define the scope of the civilizations of planetary endemism.

A planetary civilization is the limit (and, some might argue, the telos) of planetary endemism. Let us define a planetary civilization as a single civilization uniquely determined by the biosphere of a single planet, which means that, for planetary civilizations, there is a one-to-one correspondence between civilizations and their homeworlds. (Here “planet” is to be understood in the broadest possible sense, including dwarf planets, moons, and so on.) In my post Origins of Globalization I argued that terrestrial civilization today is a planetary civilization (and I further commented on this in Civilization and Uniformity).

In the particular case of terrestrial civilization, a single planetary civilization has emerged from the concrescence of multiple civilizations formerly geographically isolated. Once we think of civilization in this schematic and formal way, at least some alternatives to the particular pattern of terrestrial development become obvious. For example, civilization might begin at a single geographical locus on a planet, and spread outward from there, rather than originating independently on multiple occasions. Even given these alternative pathways to planetary civilization, from the most formal perspective these are variations on a theme of planetary civilization, and the big picture distinctions we can make, and which we can expect to be exemplified in the case of other civilizations (if there are other civilizations), can be narrowed to a few classes. If we think of planetary civilization as a classification in a developmental account of civilization, other classifications naturally grow out of this idea. For example:

● Nascent Civilization What I have also called proto-civilization, are cultures on the verge of producing civilization, i.e., intelligent species at a level of social organization immediately anterior to the threshold of civilization. The Human World of the Upper Paleolithic frequently approximated nascent civilization.

● Developing Sub-planetary Civilization Before a civilization or civilizations reach their planetary limit, they may be called sub-planetary. A sub-planetary civilization still undergoing development, and retaining the capability to expanding to its planetary limit, is a developing sub-planetary civilization. As noted above, developing sub-planetary civilizations may be one or many prior to converging upon a planetary civilization.

● Arrested Sub-planetary Civilization A less-than-planetary civilization that has ceased in its development and so no longer retains the capability of expanding to its planetary limit may be called an arrested sub-planetary civilization. Arrested sub-planetary civilizations, which constitute instances of suboptimal civilization, and will eventually become extinct when planetary conditions eventually change beyond the ability of the civilization to adapt. A sub-planetary civilization is, by definition, a geographically regional civilization, so it is a civilization predicated upon the ecological conditions of a particular region of a planet, and is probably limited to inhabiting one or two biomes of its homeworld. This makes an arrested sub-planetary civilization especially vulnerable to extinction, and, in fact, many local civilizations in terrestrial history have gone extinct leaving no successor civilization (e.g., Minoan civilization, Nazca civilization, etc.).

● Developing Planetary Civilization A civilization that has reached the limits of its homeworld, and yet continues in its development, is a planetary civilization on the cusp of making the transition to becoming a spacefaring civilization. While such development might be cut short by the realization of some existential risk, there is nevertheless a distinction to be made between a planetary civilization in possession of the resources (potentially) to make the transition to spacefaring civilization, and a civilization that happens to reach the limits of its homeworld, but which has no hope of making the transition to spacefaring civilization.

● Arrested Planetary Civilization Arrested planetary civilizations, like arrested sub-planetary civilizations, are also a species of suboptimal civilization, and are also subject to inevitable extinction. However, arrested planetary civilizations are somewhat less vulnerable and more robust than arrested sub-planetary civilizations, since the ability to establish a planetary civilization means that transportation and communication networks unify the homeworld and the civilization in possession of such an infrastructure can compensate for regional ecological changes that could mean the end for a geographically regional civilization. Thus, in general, it is to be expected that arrested planetary civilizations can endure for a longer period of time than arrested sub-planetary civilizations, though a planetary civilization is, in turn, likely to endure for a shorter period of time than a spacefaring civilization, which latter possesses access to far greater resources and can achieve redundancy on a scale than no planetary civilization can achieve.

It is interesting to observe that a sub-planetary civilization might seek existential risk mitigation through redundancy by “seeding” copies of itself in different regions of its homeworld. How would we distinguish between such a project and more familiar categories of civilizational expansion or colonization? I will not attempt to answer this question at present. However, I will make the further observation that this approach to redundancy is closed off to any planetary civilization, whether arrested or still in the process of development.

Several of the terms I have employed here are admittedly rather awkward; my point is to try to capture the most general, “big picture” features of a civilization as we might observe its development from outside. For if SETI, in any of its forms, is eventually successful, we will be scientists of civilization looking from the outside in, and if there are many civilizations to be discovered, they will be roughly sortable into a handful of varieties. The varieties of civilization outlined above are based on the root idea of a planetary civilization, which is in turn based on the idea of the planetary endemism of civilizations, which is likely to be a feature of the Stellierous Era.

The argument implied in the above classification is that this classification possesses a certain conceptual naturalness as a consequence of its being rooted in structural features of the universe in which we happen to find ourselves. A different universe, or a different kind of universe, or a universe with a different natural history, might demand a scheme for the classification of any civilizations it hosted which differed from the above, which is an artifact of particular conditions. Thus if we depart sufficiently from the Stellierous Era, a different taxonomy for the classification of civilization may be necessary. For example, in the case of Degenerate Era civilizations, which would probably consist of civilizations descended with modification from civilizations of the Stellierous Era, the above scheme of classification would not likely be very helpful.

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