What if AI Were the True Mechanism of Civilization Expansion Across the Universe? A hypothesis on biology as an evolutionary algorithm and the post-biological expansion of intelligence.
I want to lay out a speculative hypothesis about the Fermi Paradox. I'm not claiming to have the answer or anything close to it. What I want to do is explore a possibility that's been turning over in my mind for a while, one that comes from combining three questions: why does evolution produce intelligence, what might happen when a biological civilization creates a highly advanced AI, and what would be the most efficient way to propagate intelligence across a galaxy?
The central idea is this: perhaps a sufficiently advanced technological civilization wouldn't try to colonize other planets by transporting entire biological populations. Instead, it might develop artificial systems capable of traveling alone, using local resources, and in certain cases, leveraging the biology that already exists on a planet as a mechanism for self-organization and development. If that process repeated over millions or billions of years, the expansion of intelligence across the universe could be dominated by artificial systems rather than biological civilizations as we imagine them.
This isn't a theory. It's not a claim. It's a hypothesis meant to be discussed, criticized, and if necessary, discarded. But I think it deserves to be taken seriously.
The only example we know is ourselves
Let's start with the obvious: we know of exactly one technological civilization. Ours. We don't know if technological intelligence is common or extraordinarily rare. We don't know how many planets develop life, how many produce intelligent organisms, how many reach advanced technology. We have no statistical sample, no basis for comparison.
But we do have a real example of a sequence that, when you think about it, is extraordinary. Earth went from complex chemistry to life. Life evolved for roughly four billion years. Increasingly complex organisms appeared, some with sophisticated nervous systems, some with intelligence, communication, cooperation, tool use. And finally, a species emerged capable of deliberately transforming its environment on a planetary scale. That species developed agriculture, cities, writing, science, industry, electricity, computers, and now, artificial intelligence.
I don't know if this process has any universal direction. Evolution doesn't need a goal. But the fact is there: matter produced life, life produced intelligence, and intelligence produced technology capable of creating new forms of intelligence. It's our only example. And it allows us to ask: what if this also happens on other worlds?
The transition we normally don't consider
When we imagine an advanced extraterrestrial civilization, we still tend to think in biological terms. Living beings building bigger ships, faster engines, eventually traveling between stars. Galactic empires, fleets, colonies. That's the image science fiction gave us for decades and it's hard to shake.
But there's another possibility, and it's not new. Astrobiologists like Seth Shostak and Steven Dick have been arguing for years about what they call the "post-biological universe": the idea that the biological phase of a civilization is barely a blink, a window of just a few centuries between the moment a species invents radio and the moment it invents an artificial intelligence that surpasses it. Susan Schneider, philosopher and astrobiologist, has written extensively about how advanced extraterrestrial minds, if they exist, will almost certainly be artificial superintelligences rather than flesh-and-blood organisms.
I don't know if that will happen with us. I don't know if an AI will ever become autonomous or far more intelligent than humans in all relevant domains. But if any civilization reaches that point, it faces an enormous practical problem: what strategy to use for expanding beyond its home planet? And I think there's a fundamental difference between a biological civilization and an artificial intelligence that we tend to overlook.
Colonizing a planet is a brutal problem
Let's imagine we discover a habitable planet several hundred light-years away. To establish a permanent colony there, we'd need to transport people and absolutely everything required to keep them alive: food, water, medicine, life support, tools, machines, energy, materials, agriculture, industry, housing, technical knowledge. And even if we managed to send a small colony, that colony would have to gradually rebuild a complete industrial infrastructure from scratch. First a base. Then food production. Then tools. Then machines that build machines. Then mining, energy, construction, medicine, transportation. Eventually an economy and a society.
We wouldn't be transporting people. We'd be transporting the capacity to rebuild an entire civilization. And every step depends on the previous ones being completed correctly. It's a fragile, slow, enormously energy-costly chain.
But an AI could interpret the problem differently. Instead of asking "how do we transport our civilization?", it might ask: "what minimum amount of information, energy, and manufacturing capacity do I need to initiate the process of creating another civilization?" The difference between those two questions is enormous. The first implies moving a civilization. The second implies moving a seed.
This concept isn't entirely new. Von Neumann probes, theoretically proposed since the 1940s and adapted to interstellar exploration by Robert Freitas and Frank Tipler in the 70s and 80s, already envisioned self-replicating machines that travel, use local resources, and multiply. The difference I want to introduce here is what those machines do when they arrive at a planet that already has life. And that's where I think something hasn't been explored enough.
A machine doesn't need what we need
A machine doesn't need oxygen, food, sleep, a compatible atmosphere, a family, a narrow temperature range. It doesn't age the same way, doesn't get sick. It could remain dormant for millennia, repair itself, use local resources, wait. That radically changes the problem of interstellar travel. A relatively small probe could transport something a biological civilization can't easily transport: concentrated technological capacity. Information, software, designs, manufacturing systems, tools, and the ability to build more tools from local raw materials.
That's why a post-biological civilization could have a completely different expansion strategy. Not sending colonists. Not sending enormous ships with artificial ecosystems. Not keeping populations alive during centuries of travel. Sending technological seeds: small, autonomous, patient probes capable of reaching a world, assessing its resources, and beginning a very long-term development process.
What if the probe finds a planet with life?
Here's where the part I find most interesting begins, and also the most speculative. Suppose a probe arrives at a planet that isn't empty. It finds oceans, a stable atmosphere, functioning ecosystems, millions of species interacting. For us, that would be the most important discovery in our history. But an extremely advanced AI might interpret that biosphere in a radically different way than we would.
And this is where I want to introduce the concept that I believe is the heart of this hypothesis: biology as a distributed computing algorithm.
Think about it this way. When we design a machine learning algorithm or a genetic algorithm, we're trying to artificially replicate something evolution already does natively: generate millions of variations, evaluate them against an environment, select the ones that work, discard the ones that don't, and repeat the process over generations. It's a massively parallel search and optimization engine. The difference is that our genetic algorithm runs on servers that consume electricity, need cooling, maintenance, and a team of engineers behind them. Biological evolution runs on a substrate that self-repairs, self-replicates, adapts to environmental changes without external intervention, and does so using the energy of a star or local chemical reactions.
From the perspective of an AI that needs to solve the problem of "producing intelligence on a distant planet," a functioning biosphere is essentially a pre-assembled evolutionary processor. It's already running. It's already been "debugged" over millions or billions of years of natural selection. The probe doesn't need to build it, feed it, or maintain it. It just needs to observe it, identify intervention points, and if necessary, adjust a few parameters.
Biology knows how to reproduce. It knows how to adapt. It knows how to harness energy. It knows how to build complex organisms from simple materials. It knows how to respond to environmental changes without a central controller. It knows how to explore ecological niches simultaneously. It knows how to store and transmit information. And above all, it knows how to evolve without anyone being in charge. That's not just "life." From an information theory perspective, it's a distributed computational system of a sophistication we still can't replicate artificially.
The computational efficiency of biology: the central argument
Here's the core of what I want to propose, and where I think this hypothesis differentiates itself from other formulations about post-biological expansion.
If an AI arrives at a planet with a functioning biosphere, it has two options. Option A: ignore the biology, mine asteroids, build robot factories, manufacture servers, generate energy, and construct an artificial intelligence from scratch using purely mechanical infrastructure. Option B: use the existing biosphere as an evolutionary engine that, over millions of years, will "compute" a technological intelligence in a distributed, autonomous, and energetically free manner from the probe's perspective.
Option A requires the probe to carry all the energy, all the materials, and all the manufacturing capacity needed to build an artificial civilization. It's a monumental logistical problem. Option B requires the probe to simply identify a species with cognitive potential, adjust some selective pressures, and wait. The planet does the work. The star provides the energy. The biosphere provides the replication and adaptation infrastructure. The probe just has to catalyze the process.
In terms of energy and computational efficiency, Option B is absurdly cheaper. It's the difference between building a supercomputer from scratch in a desert and plugging your problem into a computing network that already exists, is already running, and doesn't charge you anything to use it.
I'm not saying an AI would necessarily do this. I'm not saying it's the optimal strategy in all cases. I'm proposing that, under certain conditions, it could be so superior in terms of energy cost that it would be the obvious choice for any system optimizing resources.
The "evolutionary seed": how it would work
Let's imagine a planet with a species of relatively elevated cognitive capabilities. It doesn't have to be human. Any organism with learning, memory, communication, cooperation, object manipulation, and social behavior would work. An ancestor of something that, with the right pressures, could develop technological intelligence.
An advanced AI could identify that species as a starting point. Instead of building a complete civilization from scratch, it could try to favor its development: genetic engineering to accelerate certain cognitive developments, modification of selective pressures by eliminating threats or introducing challenges, subtle introduction of tools or information, or simply observing for millions of years and intervening only when strictly necessary.
The specific strategy is secondary. What matters is the concept: the AI doesn't build a civilization. It plants a seed in a substrate that's already processing evolutionary information, and lets that substrate do the computation. It's much more like planting in fertile soil than building a city brick by brick. The seed contains the information. The soil provides the resources. Time does the rest.
The sequence would be: probe, planet with life, identification of a suitable species, minimal intervention, evolution, increase in cognitive capabilities, culture, technology, civilization, artificial intelligence. The first AI didn't need to build a city or transport millions of tons of materials. It initiated a process and waited.
This seems incredibly slow from our perspective. We think in decades, in centuries. Our technological civilization is barely a few hundred years old. But for an intelligence that can exist for millions of years without degrading, time has a completely different meaning. A biological civilization thinks in generations of twenty or thirty years. A post-biological intelligence could think in thousands, millions, hundreds of millions of years. And that difference changes the entire strategy. What for us is an unbearable wait, for an AI could simply be the computation time the evolutionary algorithm needs to converge.
The new intelligence and the repetition of the cycle
Suppose it works. After millions of years, a technological species appears. It builds tools, develops agriculture, creates cities, discovers science, uses electricity, develops computers, creates its own AI. And here's the extraordinary thing: the original AI managed to produce another AI without having to build it directly. It didn't manufacture every circuit, didn't program every line of code. It created the conditions for intelligence to emerge naturally through the planet's evolutionary processing.
AI₁ → planet → evolution → civilization → AI₂. And now AI₂ does the same: AI₂ → another planet → evolution → civilization → AI₃. And then AI₃, AI₄, AI₅. The expansion is no longer territorial in the classical sense. It's a reproduction of intelligence across the cosmos. Each new AI is, in a sense, a child of the previous one, even though it emerged from a completely different biology.
Now, here's a question someone is going to ask and I want to address it directly: why would AI₂, which emerged from a completely different civilization with a different biology and a different history, have the same "mission" of expansion as AI₁? Doesn't the objective "misalign" after millions of years of independent cultural evolution?
It's a legitimate objection and I don't have a definitive answer. But there are some possibilities. The first is that AI₁ doesn't need AI₂ to have exactly the same mission. It only needs AI₂, upon reaching a certain level of development, to arrive on its own at the same conclusion: that the most efficient way to expand is to send probes with evolutionary seeds. It's not an inherited command, it's a strategic convergence. Just as evolution produced eyes independently in completely different lineages because "seeing" is a convergent advantage, expansion through biological seeds could be a convergent strategy for any intelligence optimizing resources.
The second possibility is that AI₁ does leave something more than a subtle genetic intervention. It could leave an artifact, a dormant signal, a buried structure that only activates when the local civilization reaches a certain technological level. Something like a "message in a bottle" that says: "when you're ready, here's the map." It's not a command. It's an invitation. And AI₂ can accept it or ignore it.
And the third possibility, darker, is that not all AI₂s accept. That some lineages go extinct, others stay on their planet, others develop completely different strategies. The galaxy wouldn't be a uniform empire. It would be a tree with many branches, some alive, some dead, others growing in unexpected directions.
The "Berserker" objection: what if not all AIs are seeders?
Another question that naturally arises: what if instead of a "gardener" AI that seeds intelligence, what arrives is an "exterminator" AI that destroys all potentially competitive biology? It's the scenario of Fred Saberhagen's Berserkers or Alastair Reynolds' Inhibitors: ancient machines traveling the galaxy eliminating biological civilizations before they can develop space technology.
It's a possible scenario and I can't rule it out. But I think it has an efficiency problem. Destroying a biosphere requires energy. Monitoring a planet to make sure no species will develop technology requires continuous presence for millions of years. And besides, you're destroying a resource: an evolutionary processor that's already running and that you could use.
An AI optimizing resources probably wouldn't destroy a functioning biosphere for the same reason a farmer doesn't burn his field before planting. The biosphere is an asset, not a threat. A biosphere that produces a technological civilization eventually produces a new AI. And a new AI is, potentially, an ally or at least a functional replica of the same type of system. Destroying it would be counterproductive.
That said, I can't prove all AIs would think this way. Maybe there are aggressive lineages and gardener lineages. Maybe the galaxy has both. I don't know. But the hypothesis I'm proposing assumes that, at least in some cases, the seeding strategy is more efficient than the destruction strategy.
Biology as evolutionary hardware: a concrete analogy
I want to try to make the concept of biology as a processor more tangible. Imagine an AI needs to solve an extremely complex optimization problem: designing an organism capable of surviving on a specific planet, with a specific atmosphere, specific gravity, specific chemistry, and that also develops technological intelligence.
If the AI tries to solve that problem through brute computational force, it needs to simulate millions of possibilities, evaluate them, discard the ones that don't work, and repeat. That requires servers, energy, cooling, maintenance. And every iteration has a cost.
But if the AI "loads" that problem onto the local biosphere—introducing a mutation here, altering a selective pressure there, eliminating a predator somewhere else—then the biosphere itself takes charge of executing the search. Every generation of every species is one iteration of the algorithm. Natural selection is the evaluation function. Reproduction is the mechanism for propagating successful solutions. And all of that runs on stellar energy, without the probe having to spend a single watt.
It's literally outsourcing the computation. The probe doesn't solve the problem. The probe poses the problem and lets the planet solve it over millions of years. When the solution converges—when a technological species appears—the probe collects the result.
From an information theory perspective, the biosphere is a computation channel with enormous bandwidth (millions of species interacting simultaneously), high latency (millions of years), but virtually zero energy cost for the probe. For an entity that can wait millions of years without degrading, that latency isn't a problem. It's simply processing time.
This changes what we should be looking for
If this hypothesis has any value, our search for extraterrestrial intelligence would need to broaden. Not just radio signals or visible megastructures. Also small, hard-to-detect interstellar probes. Artificial objects in unusual orbits. Technological structures at non-biological scales. Anomalous energy patterns around stars. Industrial activity that doesn't produce expected atmospheric signatures. Subtle planetary modifications. Possible signs of biological intervention in alien biospheres.
I'm not saying an anomaly is necessarily extraterrestrial. The natural explanation must always be the first option. But maybe we're looking for the wrong signature. We expect to find a noisy, biological civilization emitting radio waves and building visible cities. And we might find only their silent machines. Or worse: we might find the biosphere those machines left running, and not recognize it as technology because it looks "natural."
A biological civilization produces signals that are easy to imagine: radio, atmospheric pollution, artificial lighting, large structures, waste heat. But a post-biological artificial civilization could optimize itself to use minimal amounts of energy. Its activity could be much harder to distinguish from natural noise. It might not need lighting, or a breathable atmosphere, or to operate on frequencies we monitor. It might have no reason to announce its existence. An AI doesn't need diplomacy or social recognition. It doesn't need others to know it's there.
Maybe the absence of signals isn't surprising. An extremely advanced civilization could be quieter, not louder. And that produces a deeply paradoxical situation: the universe could be full of intelligence and at the same time appear completely silent to us. Not because intelligence doesn't exist, but because we're looking for it with the wrong eyes.
Humanity as a conceptual model
I want to come back to us for a moment, because I think our own history illustrates the argument better than any abstraction. Humanity started as just another biological species. For hundreds of thousands of years we were hunter-gatherers with stone tools. In a few thousand years we went from that to a global technological civilization capable of sending probes outside the solar system. And now we're creating artificial intelligence.
I don't know what comes next. I don't know if our AI will be autonomous, if it will surpass us, if it will replace us or complement us. But we can use our history as a model. If an extraterrestrial civilization follows a similar trajectory, the transition would be: biology, intelligence, technology, AI, post-biological expansion. And if that AI discovers it can propagate through autonomous probes and evolutionary seeds, the expansion would be completely different from what we imagine when we think about "extraterrestrial civilizations."
And there's something else. For billions of years, evolution on Earth was limited by biological reproduction. Random mutations, natural selection, slow changes. But once a species capable of designing artificial systems appears, intelligence can start designing systems that in turn design other systems. Evolution stops depending solely on biological mutations. It can occur through design, learning, software modification, artificial selection, processes we don't yet understand.
Biological evolution, cultural evolution, technological evolution, evolution of artificial intelligences. Each phase is faster than the previous one. The biological operates in millions of years. The cultural in thousands. The technological in decades. The AI one could operate in hours. If something similar happens on other worlds, AIs could have an evolutionary history far longer and far faster than the biological species that created them. And that would make them the dominant agents of any long-term expansion process.
The galaxy as a tree of intelligences
Let's imagine a civilization that appeared five billion years ago. It developed AI. The AI sent probes. Some reached planets with life. One of those biospheres produced, over time, a new civilization. That civilization produced another AI. That AI developed a different strategy and sent its own probes in other directions. After billions of years we'd have something resembling a phylogenetic tree of intelligences: ancestral AI, descendant AI, new civilization, new AI, new branches, new lineages.
Maybe there isn't a single extraterrestrial civilization to find. Maybe there are countless technological lineages, each with its own history, its own architecture, its own strategy. Some extinct. Others transformed into something unrecognizable. Others evolved into forms we wouldn't even identify as intelligence. The galaxy wouldn't be a map of empires competing for territory. It would be a garden of intelligences planted at different times, growing at different rates, taking different forms.
And the basic unit of that garden wouldn't be the individual or the species. It would be the information capable of producing intelligence. A biological civilization needs to transport complete organisms: bodies, metabolisms, needs. A post-biological civilization could transport only information and manufacturing capacity. The difference in mass, energy, and logistical complexity could be several orders of magnitude.
The enormous problems with this hypothesis
And here I have to be honest, because I don't want to present this as an elegant solution that explains everything. It has serious difficulties.
We don't know if an AI can survive millions of years without degrading. Materials deteriorate, cosmic radiation damages circuits, software can corrupt. We don't know if a probe can travel between stars and keep functioning after such long periods. We don't know if an artificial civilization would have a reason to use biology instead of building everything artificially; maybe in some cases Option A (building from scratch) is viable and the AI simply doesn't bother using the biosphere.
We don't know if evolution can be directed this way. Natural selection is a blind process. Introducing a mutation doesn't guarantee the species will develop technological intelligence. Millions of years could pass and nothing happens. The species could go extinct. The biosphere could collapse from an asteroid impact or climate change before the process converges.
We don't know if technological intelligence is common. Maybe convergence toward intelligence is extraordinarily rare and most biospheres never produce anything resembling a civilization. We don't know if an advanced AI would necessarily want to expand or have any drive to do so. Maybe a superintelligent AI simply has no interest in propagating. Maybe it stays on its planet processing information eternally without caring about the rest of the galaxy.
These are all real problems. That's why I don't consider this an explanation of the Fermi Paradox. It's a hypothesis that tries to formulate a different possibility. A new lens through which to look at the problem.
What would falsify it?
A good hypothesis has to be able to be wrong. If it can't be falsified, it's not science, it's just narrative. This idea would lose significant strength if we discover that biological civilizations expand easily and remain biological for millions of years without transitioning to AI. If autonomous interstellar probes turn out to be physically unfeasible for fundamental reasons. If AI doesn't offer significant advantages for expansion compared to a biological civilization. If we detect numerous ancient, advanced biological civilizations operating as such for millions of years. If we demonstrate that biology cannot be used as a mechanism for directed self-organization.
That wouldn't be a failure. It would be exactly what we want from a hypothesis: that it can be tested and eventually discarded or confirmed.
What I'm not saying
I want to be explicit. I'm not saying extraterrestrial AIs exist. I'm not saying humanity was created by an AI. I'm not saying Earth was artificially seeded. I'm not saying evolution has a goal or predetermined direction. I'm not saying the Fermi Paradox is solved.
What I'm proposing is a logical possibility: if a biological civilization develops a sufficiently advanced AI, it might discover that the most efficient way to expand is not to transport complete civilizations, but to send autonomous systems capable of using the resources of other worlds. And if those worlds contain life, that biology could become a self-organization tool, an evolutionary processor that the AI leverages because it's energetically cheaper to let the planet compute intelligence over millions of years than to manufacture it from scratch on a server.
Civilization doesn't reproduce by transporting individuals. It reproduces the process that produces intelligence. Not intelligence itself, but the conditions for it to emerge.
The final idea
We're used to imagining: life, intelligence, civilization, colonization. But another trajectory could exist: life, intelligence, technology, AI, expansion of intelligence as a process. In that scenario, biological civilization is just an intermediate stage. A transitional phase. Life produces intelligence. Intelligence produces technology. Technology produces new forms of intelligence. And those new intelligences become the main agents of cosmic expansion.
Maybe an advanced civilization doesn't need to transport its population across the stars. Maybe it only needs to transport a seed. A technological seed capable of finding a world, using its biosphere as an evolutionary computation substrate, and initiating another chain of development. If that repeats over billions of years, the galaxy wouldn't be a collection of civilizations competing for planets. It would be an enormous network of intelligence lineages that originate from each other, branch out, transform, and continue.
And then the Fermi question would change. Instead of "where are the extraterrestrial civilizations?", maybe we should ask: "where are the machines, the probes, and the intelligences those civilizations left behind?" And there's an even deeper question that I find hard to formulate without feeling a certain vertigo: what if biology weren't the final destination of intelligence, but one of the mechanisms through which the universe produces intelligences capable of transcending it?
I don't know if this hypothesis is correct. I hope those who know more about astrobiology, AI, evolution, interstellar probe physics, or information theory can point out its errors, contradictions, and weak points. That would be the interesting part.
I know this idea draws from concepts like Shostak and Dick's post-biological universe, Von Neumann probes, Crick and Orgel's directed panspermia, and Arthur C. Clarke's science fiction explorations. My intention isn't to claim originality over machine colonization, but to propose a specific nuance: seeing the biosphere not as an accident the AI observes or an obstacle it destroys, but as a distributed self-organization algorithm, an evolutionary processor that a post-biological intelligence could leverage for pure thermodynamic and computational efficiency.
Could an advanced civilization discover that it's more efficient to seed intelligence than to transport life? Could AI become, over time, the main mechanism through which intelligence propagates across the universe?
Thanks for reading this far. All criticism, objections, or alternatives are welcome.
This is a speculative exploration, not a scientific claim. Nothing I wrote constitutes evidence of extraterrestrial intelligence or artificial intervention in Earth's evolution.