The Fermi Paradox arises from a striking contradiction between two widely held premises:
High probability estimates for extraterrestrial civilisations: Given the vastness of the universe (13.8 billion years old, with roughly 100 billion stars in our Milky Way alone, and likely many Earth-like planets) there has been ample time for life to originate, evolve, and spread across the cosmos.
Complete lack of evidence for extraterrestrial intelligence: Despite the above, we observe no clear signs of alien life – no signals, no probes, no megastructures, no evidence of interstellar colonisation – not even any promising sign of the most primitive forms of life. Meanwhile, many of us, with the mainstream media taking the lead, clutch furiously at any passing straw: “New planet discovered that is rocky and in the right place for liquid water. Scientists say it might be home to alien life!”
The paradox takes its name from a casual 1950 remark by physicist Enrico Fermi: “Where is everybody?” Given even conservative assumptions about the likelihood and longevity of advanced civilizations, many should have emerged and become detectable by now. Yet, the observable universe remains silent. The Drake Equation – an attempt to estimate the number of communicative civilizations in the galaxy – reinforces the puzzle. Even with pessimistic parameters, it suggests we should not be alone.
Proposed solutions to the Fermi Paradox include:
We’re rare or first: Life might be extraordinarily rare or unique to Earth (the Rare Earth Hypothesis). Intelligent life could be difficult to evolve, short-lived, or we may be the first advanced civilisation in our galaxy.
They’re not interested: Advanced civilisations may choose not to colonise or contact less developed species. They might communicate in ways beyond our detection capabilities or could be deliberately observing us while remaining hidden.
The simulation hypothesis: We could be living in a simulated reality where alien civilisations do not exist or are intentionally excluded.
They’re gone: Civilisations might tend to self-destruct or succumb to cosmic catastrophes before achieving interstellar expansion.
We’re not looking right: Our search methods might be limited or misguided—targeting the wrong wavelengths, timescales, or signals. Alien technology might be indistinguishable from natural phenomena.
They’re here, but hidden or unrecognised: Some suggest controversial evidence such as UFOs or UAPs could be alien probes or visitors that we fail to identify properly.
The Dark Forest hypothesis: Inspired by Liu Cixin’s novel The Dark Forest, this hypothesis portrays the galaxy as a dangerous wilderness where every civilization is a silent hunter. Revealing one’s presence risks annihilation because it is impossible to know another civilisation’s intentions, civilisations can quickly become existential threats, and assuming goodwill when it is absent can be fatal. Mutual silence, therefore, is a strategy for survival.
As with many other foundational problems explored in this book, the Fermi Paradox is not a problem lacking in proposed solutions; the real problem is that none of the existing solutions command consensus.
The Fermi paradox has always carried a strange mix of curiosity and dread. The universe is old and wide and full of places where life should have taken hold, and yet every radio dish comes up empty. Under 2PC this becomes painfully clear. The primordial wave function could collapse only once, because collapse is not a repeating physical glitch but a metaphysical resolution of contradiction. When that resolution happened, the universe stopped behaving like a Phase 1 generator of branching possibilities and settled into the single embodied history that could host a coherent subject. Phase 1 had something like the power of an unbounded search, but that power only existed before consciousness appeared. Once a subject emerged and valuations had to be unified, that search space was no longer available. The cosmos we inhabit is the one that made it through the threshold. It is not physically impossible that it could happen again, but it is so extraordinarily improbable that we can rule it out (this is the very same "almost certainly false" that appears in the subtitle of Mind and Cosmos). So the question of where everyone is becomes almost rhetorical. If any separate locus of conscious existence ever did arise, it would almost certainly belong to a metaphysically disconnected branch that we can never encounter from inside this collapse. In the world we can interact with, there is no one else. We are it.
This is a novel empirical prediction. If we were to find strong evidence for a second example of life having evolved, anywhere in the cosmos, we would have legitimate reasons for doubting the two phase model, and if we find conscious life then 2PC is almost certainly false.
It turns out the old geocentrists weren’t as far off as we like to think. Ever since the shift from Ptolemy to Copernicus, people have assumed that once Earth was removed from the centre of the solar system it must also have lost any special place in the larger cosmos. Later we decided the universe didn’t have a centre at all, and most people accepted that even if they never quite understood what it meant. It felt harmless to believe the universe was everywhere and nowhere at once, so no one worried about it. 2PC changes this in a very simple way. If consciousness emerged only once, and if that emergence is what brought Phase 2 into being, then the point of origin for the embodied cosmos is not a spatial coordinate at all but a locus of subjectivity. Our planet does not sit at some geometric centre, but it is the only location that carries the structures capable of embodiment. Earth is the metaphysical centre of the cosmos.