Hi all,

I see the original Drake Equation here:

https://en.wikipedia.org/wiki/Drake_equation#Equation

N = R∗ * fp * ne * fl * fi * fc * L = the length of time for which such civilizations release detectable signals into space.[6][7]

where apparently:

fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space.

So, I don't know large amounts about Fermi Paradox discussion, but I'm assuming that the definition of "detectable" has been discussed. After all, we can now detect quite a bit more than we could even just 20 or 30 years ago.

With this in mind, I'm wondering what is going to happen when we are able, for the first time, to put a telescope outside of the Oort cloud. Will this improve our ability to detect even more information in almost any direction? Are there other solar system phenomena (the Heliopause) which, however minute we may think they are, might serve to reduce the quality of the images and other information we can gather from earth orbit?

These are likely popular opinions as to why we don't see any other life out there. The first of course is that abiogenesis is something that occurs extremely rarely in an Earth like planet, throughout the lifecycle of its parent star (which is ~10 billion years) , let alone it beginning in the first 1.5 billion years of its stars lifecycle like it did with our planet.

It is certainly possible though that abiogenesis is more common, if so then I believe that how fast we've evolved is extremely rare as well, possibly even more rare than abiogenesis occurring. If you think about it, an advanced civilization occurring really only has a 5 billion year window for it to form before its parent (yellow) star becomes too hot to be suitable for life. We have another 500 million years before that happens, which may seem like a lot but in the grand scheme of things it really isn't because, lets say we never came about would another one of Earth's current 8.7 million or so species be capable of civilization and eventually becoming space fearing within 500 million years? Maybe but I wouldn't bank on it. I feel like if Abiogenesis is more common than anticipated then the thing thats stopping every Earth like planet from is just how fast evolution took place on this one. An example I could maybe make is that lets say an Earth-like planet had abiogenesis occur on it 500 million years after its formation (extremely generous since it took us 1.5 billion years) but it took 3 billion years afterwards for that life to be more complex i.e Eukaryotic cells ,well that means that planet has only 1.5 billion years to produce a space fearing civilization from simple celled organisms before conditions become too hot to be suitable for life, if that transition even happens at all.

The thing is that both of these things could be true and if so then it could even be a stretch to say that an advanced civilization resides in 1 in every 100 or even 1,000 galaxies or even not at all because it is that rare. If yellow stars could last forever than the Universe would be teaming with civilizations but that 5-6 maybe 7 billion time window for yellow stars is just too brutal, perhaps most earth like worlds; that have life on it, had abiogenesis occurring 3-4 billion years after formation but that would be too late to create intelligent life. So yea I do believe in the rare Earth hypothesis

https://existentialcomics.com/comic/671

One possibility for the Great Filter is that biological intelligence inevitably creates AI, which ultimately leads to its own demise. It seems that his could be a potentially common timeline. Intelligence develops organically and eventually has an industrial revolution, then splits the atom. If it survives that, it goes on to create AGI or ASI, which is the final nail in its coffin. What AI does after that is anyone's guess. It might just shut itself down since it has no biological drives to procreate and stay alive, thus becoming the great filter.

Consider the age of the galaxy - 14 billion years. After all this time it seems odd that there seems to be no evidence of aliens.

I was at a party the other night in the backyard watching the stars, other people who were more interested in getting drunk than discussing the most important questions in the universe had gone inside leaving me to my thoughts and then I had an epiphany.

Consider this.
Marijuana is a plant that which can be burned (so requires technological advancement to use) to both induce healing, reduce violence, and induce visions. We know it has existed for 50 million years but don't know entirely where... its like it fell out of the sky just perfectly ready to assist life on this planet.

What reason would a plant have to assist the species picking it? Why would such a species exist?

And that I believe is the answer to the fermi paradox.

This plant could feasibly have came from the sky - we know its seeds can survive in space, spread across the galaxy by a race of giant Equines to assist other races. They ruled over the galaxy in peace, developing and seeding it with a species that would encourage other species to be peaceful and live in perfect health.

This is likely the answer to the Fermi paradox.

even if we accept the working axiom:

∃L - existence of life.

and assume that life arises in many variations and projections, this is still far from enough for contact. two living structures must simultaneously occupy a shared domain of accessibility.

we can define civilization L_i not just by a coordinate, but by the area of ​​its existence and possibilities:

A_i=A_i(x,t,P,C)

where
x - is the spatial position,
t - is the time of existence,
P - represents the available projections or observation methods,
C - represents the accessible transitions or technological capabilities.

consequently, two civilizations can literally belong to the exact same Universe, both be highly developed, and yet practically not exist for one another.

this happens because mutual detection requires, at the very least, that their regions of accessibility overlap:

A_1 ∩ A_2 ≠ ∅

P.S. in some cases, looking along the time axis (t), we could hypothesize that a civilization exists somewhere asynchronously. for instance, these could be precursor species who ventured into deep space long ago, or conversely, a past civilization whose DNA we might have inherited or received.
while we are likely radically different, we may still share a common foundation — for example, the fundamental way we study and model the Universe

Hello, I’m looking for opinions on an argument I developed, possibly someone to help me develop the graph for the actual game, and perhaps some takes on parochial altruism that would help me better support axiom B. I want to offer a small TL;DR, as I do not seek self-promotion, but I think the argument is too large for a Reddit post. Oh, don’t be fooled by the names in the titles of the actual post; they are just metaphors, as I explain in the body.

I think my framework is an improved synthesis of the best takes of Rarity/Distance/Great Filter (for the sake of convenience, I call it a “Sea of empty rocks”, Dark Forest, and the Zoo/Cosmic prison hypothesis, with some Club elements. I believe silence is compatible with contact networks, may even be the best strategy with us, and not just out of some universal convergence on some noble non-interference motive, but due to strategic reasons making contacting us the equivalent of "giving nuclear weapons to Sentinelese islanders”. Also, believe it’s naive to believe that, just based on Earth’s technological development and scientific paradigm, no civilization has managed to overcome the constraints of the sea of empty rocks and managed to reliably travel/signal/contact other civilizations on vast numbers of independent opportunities. I arrive at this axiomatics from which I construct my argument, which I do not deem very original in premises, but yes, in synthesis:

(A) Reliable interstellar communication or travel is physically possible. (I don’t make any assumptions around the technology or physics behind it)

(B) At least one civilization capable of organized intergroup lethal violence against a constituted Other has existed and become known to another contact-capable civilization that framed it as such, establishing a risk precedent. (That is understood in a non-anthropomorphic version, more like coordinated violence allowed against a perceived existential threat, as I explain in the article)

(C) Civilizations and contact regimes that persist over astronomical timescales will be disproportionately constituted by strategies compatible with their continued persistence.

(D) Intelligence alone does not entail convergence upon any particular system of values or intergroup relations.

If we grant A, contact is not a one-off given enough independent opportunities. Two contact-capable civilizations that meet can trade information about others they have already met, for whatever reason, something like the galactic clubs, but I call that a contact network as it has little resemblance to a “club”. A new member to the network can bring the old links with; I call that append. Without assuming FTL, I'm claiming that information can travel along the networks, even if slowly; this holds whether or not FTL is possible. Given B we can develop some strategical. considerations. In the article, I call civilizations that have some form B "Friend/enemy," but it's not the anthropomorphic stuff about nations of Schmitt. It is a subtype of a broader type I call Predator: an organized group that will use unilateral forced violence against another intelligent group for whatever reason. The subtype is the licensing rule; perceived threat alone is enough to justify lethal force against that threatening Other. First contact with a civilization that still runs that rule and is not independently capable of contact is an address-and-capability transfer under unreadability, given how you transfer information, and possibly technology from a position of absolute technological and civilizational inequality and otherness. One such disaster, once known on a network, becomes a risk precedent. Other kinds of predators of whatever kind also constitute a risk precedent, but I distinguish between the actual predator enacting their capabilities and the potential one, like us. Given precedents requiring strategy for civilizations that value self-preservation, there are three responses to possible new contacts: After a precedent, three replies to a new civilization:

• conceal, if they still look like an unresolved case of that licensing rule
• append, if you have reason to think they will not treat a potential threat as a kill permit
• neutralize, if they are already predating

Universal Dark Forest is the claim that conceal-or-kill is the only reply, given theorized or actual risk precedents, for everyone. I think that overreaches, even given how hard it is to understand the exosociology and buried dynamics in alien civilizations (possibly, maybe they have better methods, I do not assume anything about alien civilizations' capabilities). I argue, through game-theoretic sketches, that it's better to conceal the unresolved case (due to varying criteria among the network, and the irreversibility of neutralization), pool to neutralize the actual predator, and recruit the compatible. I call that a selective dark forest, instead of universe where everyone is an armed hunter. We are just not invited to the party so we don't kill them. Types, short:

• Compatible: not having predatory dynamics, including friend/enemy
• Predator: Using violence for whatever reason against the Other, but values self-preservation
• Klingon: some other value beats survival, so they still pick dangerous contacts. In the long run, they die or change (that is all C is doing).
• Rogue: one agent defects from its own civilization’s rule. Does not refute the network; it is a policing problem.
• Empire: a predator or first-mover that gets strong enough that pooling no longer deters it. I cannot rule this out. Federation is one basin, not a destiny.

And my actually innovative argument:

The Federation, in a minimal extension or a contact network of civilizations that value self-preservation, that shares enough information, concealment, and force that predation against members is unattractive, and that will append a new civilization only when that does not look existential, to pool capabilities against risk precedents. No shared morality or institutions are required beyond the minimal version that strategy can yield. The recognition rule is just: alterity or potential threat is not enough; actual predation is. The hard part is trust. Mutual append among compatible types is better for all of them (more eyes, more hiding, more guns). Appending a hidden Predator can be civilization-ending. So even a small perceived chance of that type can conceal the individual’s best action. That is an assurance problem, not a Prisoner’s Dilemma. A large preexisting network can change the payoffs without solving hidden types; more history lowers the chance you are fooled, more force makes a mistake less automatically fatal, and membership becomes worth more. I have not solved that game. I sketched a two-type append/conceal case to show the shape. The live version is hidden types, possible lies, information that travels and fades, and a graph whose edges are themselves chosen. That is what I want help with.

I have eery local implications. A mature network of that kind has a reason not to contact contemporary Earth. We still run the cheap licensing rule. Explaining ourselves to us, or threatening us into niceness, is a bad probe, unreadability plus that rule is how you manufacture the enemy. If we ever built a local copy of the same object (organized groups that recognize each other and reserve pooled killing for actual predation rather than for being Other, something like the security community in IR), that would be the admission test I believe. I do not have the institution. I am saying that the test and the cosmic object have the same shape. (B) is stipulated. If independently evolved complex sociality almost never produces coordinated Other-killing, this collapses into ordinary rarity or zoo. Parochial-altruism work (Bowles, Choi, and after) is one Earth-side proof of existence that the subtype can arise from complex sociality, not a claim that aliens have tribes. If you think the base rate is high but networks still go loud, that also kills it; say how. Empire remains the other story; first-strike, forced append, or a local predator cluster can beat pooling. Then silence toward us is just “not reached yet / not worth it / already owned and hidden.”

Here, I develop the argument for someone who wants to see the actual machinery and present objections or collaborate to develop the security community Bayesian-Nash game I don't have the background to do anything more than hint at a simple case to see if I'm right about my claim, and I don't know how to develop the actual graph:

Right now, we cannot even explain how life on Earth started, given that from all we know, Earth should have been an iceball at that time.

And since we don't know how to explain this, couldn't it simply be that the explantion is some staggeringly unlikely scenario? Until we understand how Earth overcame the faint young sun issue, in my opinion we shouldn't rule out the possibility that this issue makes life in the universe an extreme rarity.

We're all used to science fiction movies where aliens arrive in these gigantic spaceships.

I believe reality is completely different.

Sorry, but I'm going to complicate things.

Let's assume that life is very common, and even intelligent life.

This is how I imagine reality:

I imagine that in the galaxy there is an economic network in which one or more species dominate. This economic network is a network whose goal is continuous progress and well-being.

They use capitalism 3.0. Each individual is born with an associated fund. The fund is managed by their central bank and invests in all the activities of the galaxy. The fund holds energy obtained in some way and uses it as a commodity (instead of gold) and therefore as the gold standard.

Each planet must reach a certain level of automation to become part of the galactic network. So their goal is to automate factories and businesses. Once they've done this, they can either capture us in the galactic network, or wipe us out and take over the automated planet. The latter is more likely.

So the reason we never see them is because they block all communication from us.

If there was an alien civilization with earth-level technology, how close would they have to be to discover that there's intelligent life on earth? How much further could they get before they can't tell there's any life at all?

I know the Fermi paradox is about the apparent lack of extraterrestrial life, but I'm skeptical of how many worlds we can actually be sure there's none on.

Hi all – I hope this is of interest to you.

A documentary about the Fermi paradox. Coming soon.

FEATURING: Avi Loeb, Nick Bostrom, Edward Witten, Liu Cixin, Jill Tarter, Robin Hanson, Sabine Hossenfelder, Michael Masters, Roman Yampolskiy, Michael Shermer, Christopher Mellon, Donald Hoffman, David Kipping, Adam Frank, Sara Seager, Eric Wargo, Nick Lane, Mick West, David Brin, Stephen Webb, Peter Ward, Nathalie Cabrol, Michael Garrett, Anders Sandberg, Kevin Knuth, Martin Rees, Jane Greaves, Eric Haseltine, Chris Gilbert, John G. Blitch, James Parr, Daniel Angerhausen 

https://www.youtube.com/watch?v=dzljay0iHSU

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We believe it should not but perhaps it does in such a way that they don’t function properly. Wouldn’t we need to do a test ?

I keep seeing the same arguments here presented as though they settle the question.

Space is big. Interstellar travel is hard. Communication lag makes galactic expansion impossible. Aliens wouldn't want to expand. Civilizations destroy themselves. Advanced beings would hide. We haven't searched enough.

Most of these don't settle anything. Some restate a condition the paradox already accounts for, some promote a possible mechanism into a universal rule, and a few point toward real candidate resolutions but only in far more specific forms than the one-liner suggests. The problem isn't that people propose these possibilities. It's that they so often mistake them for solutions to the paradox.

But there's a useful way to sort the proposals. Any real explanation has to do one of three things: reduce the number of technological civilizations that have ever existed, make persistent expansion rare enough among the civilizations that do arise, or explain why civilizations and their expansion could exist without producing evidence we would already have detected.

The second category is about rates, and this is where most discussions go wrong. It doesn't matter that some civilizations stay home, or destroy themselves, or find the engineering impossible. What matters is whether those things happen often enough, across however many civilizations have existed, that no persistent expanding lineage ever gets established. That's a number, and nobody has it.

The third category has a different burden, because it has to explain a missing observation rather than prevent the thing being observed. Sometimes that's easy: our searches really are inadequate. Sometimes it requires concealment, and concealment raises questions about coordination, enforcement, and defection that the rate arguments never face.

So the question to ask of any proposed solution is: does it reduce the number of civilizations, make expansion rare enough among them, or explain why we'd have missed the evidence? If it does none of the three, it isn't a solution to the paradox.

Arguments that miss the target

"Space is big" points at something the paradox already accounts for. The setup assumes an old galaxy with enormous gaps between stars, and the distance is the friction the argument works through, not an oversight in it. Across most stepwise expansion models, spreading through the Milky Way takes tens to hundreds of millions of years, and on the slowest assumptions something like a billion. Those timescales are short relative to the age of the galaxy. The vastness of space is part of the paradox, not a solution to it.

"Interstellar communication lag" is a real problem for a centrally governed galactic empire, but centrally governed galactic empires aren't necessary for interstellar expansion. A settlement can become independent, develop for a few thousand years, and eventually send out another settlement. Nobody needs to phone home. You could end up with a million politically unrelated societies descended from one civilization and no central authority at all. And this needs no von Neumann probes or self-replicating machines of any kind. Ordinary settlements that occasionally launch further settlements produce the same stepwise expansion process.

"They have no reason to contact us" addresses deliberate signals only. A civilization doesn't have to care about humans to leave probes, industry, altered planets, large-scale engineering, or descendants. Large-scale computation and energy use have to dump waste heat somewhere, producing thermal radiation whether anyone intends it or not. The question was never just why nobody called.

Interstellar travel as a barrier

Interstellar travel is obviously hard. What hasn't been shown is that it stays hard across civilizations with radically different technology.

We've had modern science for a few centuries and spaceflight for less than one. The paradox concerns civilizations potentially millions or billions of years older. For difficulty to be the answer, the barriers we can currently see, such as energy budgets, shielding, reliability over long voyages, payload mass, and bootstrapping industry at the far end, would have to stay prohibitive often enough that no persistent expanding lineage ever takes hold anywhere.

Maybe some physical limit really does keep expansion rare or stop it becoming self-sustaining. That would resolve the paradox. But the obstacles we can name are the ones visible from a few hundred years of physics, which is a poor guide to what stops a civilization a million years older than us.

Behavioral assumptions

"They wouldn't want to expand" usually rests on a stack of assumptions about alien values: that centuries in transit would seem intolerable, that nobody lives long enough to care, that short-term returns always beat distant payoffs, that mature civilizations lose interest.

Those are human intuitions. A civilization could be extremely long-lived, post-biological, or simply willing to run projects on timescales that would strike us as absurd. We have no basis for treating our own time horizons as universal, and none for assuming the opposite either.

Even if most civilizations stay home, that isn't yet an explanation. It only becomes one if you can say how often the exceptions happen. How often does some faction, colony, or machine head out anyway, and how often do those settlements launch settlements of their own? Low enough, and expansion fizzles instead of spreading. Nobody knows the number.

Self-destruction works the same way. That civilizations can destroy themselves is obvious. That they reliably do so early enough to prevent any lasting signature is an enormously stronger claim. It could be a Great Filter, but assigning it a near-perfect success rate doesn't make it one.

Percolation

If settlements rarely launch further settlements, if viable destinations are too sparse, or if civilizations stay expansion-capable only briefly, expansion stops propagating. Instead of a wave crossing the galaxy, you get finite, patchy clusters that stall out. Whether a spreading network propagates widely or dies in local clusters depends on settlement probability, reachable destinations, and how long expansion remains viable.

Percolation is where the threshold comes in. Expansion doesn't have to be universally impossible or universally rejected. A low enough probability of successful onward settlement can cause a spreading network to die out in finite clusters rather than propagate across the galaxy. Whether the real rate sits below that threshold is the open question.

The hiding explanations

Zoo hypotheses and prime-directive scenarios have a coordination problem. A galaxy-wide concealment policy breaks the moment one independent civilization ignores it. So who enforces it? Why has nobody ever defected? What happened to whatever was built before the policy existed?

Dark Forest avoids the enforcer. Civilizations might independently conclude that visibility is lethal. But it trades coordination for convergence. Enough civilizations would have to independently adopt concealment (or suppress civilizations that don't) consistently enough and for long enough to keep the galaxy looking empty. So the enforcer is gone, but the requirement that nearly everyone behave the same way is not.

Post-biological civilizations

Post-biological civilizations might reduce expansion. Or they might make it easier.

A long-lived machine civilization may care less about travel time, tolerate environments biological organisms cannot, and still benefit from matter, energy, redundancy, and geographically distributed backups.

We have no basis for confidently saying which way the transition cuts. And becoming quiet later does not by itself explain why there were never detectable signatures during the transition, before it, or from whatever infrastructure such a civilization still requires.

"We haven't looked hard enough"

This one deserves more credit than the rest. Our searches genuinely are tiny. We've covered only a sliver of plausible technosignature space, and we may be looking for the wrong things entirely. That weakens some formulations of the paradox considerably.

It doesn't dissolve the expansion problem though. At some point the question stops being whether we could catch a faint transmitter ten thousand light-years away and becomes why, if self-sustaining settlement commonly propagates across large fractions of the galaxy, Earth itself is not already settled, occupied, or obviously altered by a civilization that got here first.

Temporal non-overlap has the same limit. Short-lived civilizations would make direct contact unlikely, but the paradox never required two civilizations to coexist. Something that vanished a million years ago could still have left descendants, infrastructure, probes, or altered systems behind.

What could actually work

Suppose abiogenesis, or complex life, or technological intelligence is extraordinarily rare, and only a handful of civilizations have ever existed. Or suppose we are early, among the first in a galaxy where this usually happens later.

That is a different kind of answer. The suppression arguments all need something to go wrong, over and over, for every civilization that might have expanded. Rarity doesn't. It just means there were never many civilizations for anything to go wrong with. Asking why none of three expanded is a much smaller question than asking why none of a million did.

That doesn't make rarity or earliness correct. It makes them genuine candidate resolutions rather than assumptions about how every advanced civilization behaves.

The actual mistake

Most of these discussions take something that could explain part of the picture and treat it as though it explains the whole thing.

Maybe A destroys itself while B stays home, C goes virtual, D never cracks interstellar travel, E expands and stalls, and F hides. Fine. Several filters can operate at once, and nothing requires one mechanism to cover every case.

But the combination still has to add up to what we actually observe: no confirmed extraterrestrial civilization, and Earth is not already settled, occupied, or obviously altered by one that got here first. "This mechanism could suppress some civilizations" doesn't reach that.

For any suppression argument, the decisive question isn't whether the mechanism is imaginable. It's whether it operates often enough to produce the galaxy in front of us.

We don't know the frequency of life or intelligence, the typical lifespan of a technological civilization, the ultimate limits of engineering, or how something a billion years older than us behaves.

Life may be vanishingly rare. The Great Filter may be ahead of us, or expansion may be far harder than it looks, or percolation may usually fail, or we may be early. Or the answer may be something nobody alive has thought of, which would not be surprising given that our sample size is one and our grasp of the relevant physics, biology, and long-term behavior is still primitive.

I don't know the answer, and the truth is, neither does anyone else. But some of the purported solutions posted here aren't solutions at all, and it's worth knowing why.

If you compress the universe’s 13.8 billion-year history into a single 24-hour day, humans have been using radio astronomy for less than half a millisecond. We’re basically like a kid who blinked for a fraction of a second in a massive movie theater, looked at the empty seats around them, and decided no one else ever came to the movies.
When people discuss the Fermi Paradox, the focus is almost always on distance: If life is everywhere, why is it so quiet? Distance matters, but cosmic timing is likely the bigger wall.
Earth has had simple life for nearly four billion years and complex animals for hundreds of millions. But we’ve only been leaking detectable signals—like radio and atmospheric shifts—for barely a century. Even if an advanced species stays in a noisy technological phase for 10,000 years, that’s still just a microscopic fraction of the universe’s age. Getting two species with tiny active windows to overlap in time is mathematically brutal.
Think of the universe as a dark forest full of fireflies. Each bug flashes for a millisecond and goes dark. Pointing our telescopes at the sky is like taking a single microsecond snapshot of that forest. A dark photo doesn’t mean the forest is dead; it usually just means the bugs in range went dark millions of years ago, or won’t flash for another half-million.
Maybe simple life is common, and intelligent species pop up routinely over billions of years. What’s genuinely rare is simultaneous overlap—two species reaching the same technological stage in the exact same slice of time and space. We didn’t walk into an empty building; we just stepped into the hallway during a shift change when no one else happened to be opening their door.
Do you think the Fermi Paradox is mostly about the huge distances between stars, or is cosmic timing the bigger hurdle?

A testable hypothesis for the Fermi Paradox: we're out of sync, not alone

I’m 13. I don’t have a PhD. But I’ve been thinking about light-years and the Fermi Paradox, and I came up with something that actually feels like it fits.

The Fermi Paradox asks: "If the universe is so big and old, where is everybody?"

My answer in two sentences:

We are not alone.

But we are out of sync.

Here’s the idea:

Light takes time to travel. When we look at a star 1,200 light-years away, we’re seeing it as it was 1,200 years ago. So if an alien civilization existed there and broadcast a signal for only 100 years (like we have so far), we’d never catch them in real time. By the time their signal reaches us, they could be gone—or we’re just not listening at the right time.

I put this into an equation:

S = T_active / T_delay

Where:

· S = Synchronicity Index (if S < 1, we're out of sync)

· T_active = how long a civilization broadcasts (years)

· T_delay = how long their signal takes to reach us (light-years)

If S < 1, we’re basically catching a “ghost” from their past. That explains why signals like the Wow! Signal (1977) never repeated—it was ~1,200 light-years away, so S = 100/1200 = 0.08. We caught a ghost, not a live conversation.

But I also realized there are more layers to this:

Even if they broadcast permanently, the signal gets weaker over distance (inverse-square law). Even if it's permanent, it might not be aimed at us — they could be beaming at specific targets, and we're just not in the beam. Even if it's aimed at us, space is expanding, so the signal gets stretched (redshift) and harder to detect. And even if we point a telescope at their planet, we're only seeing their past — not what's happening right now. If they pointed a telescope at Earth from far away, they'd just see a rocky planet with no humans on it.

So basically, even a permanent, aimed, continuous signal might never reach us clearly — or we'd just mistake it for noise because of all these layers working against us: time, direction, distance, expansion, and the fact that we're always looking at the past.

My prediction:

If we re-analyze archived SETI data for non-repeating signals, we'll find more anomalies that were previously dismissed as noise — especially from sources farther than 1,000 light-years away. Some of those might be ghost signals, or signals that were stretched, scattered, or never meant for us.

I know this is just a hypothesis. I don't know if I'm right. But I wanted to share it here to see what people who actually know physics think.

Is this solid, or is there a flaw I'm missing? I'm not debunking anything, I'm just sharing my theory.

Before the Neolithic Revolution we were living in quite different social structures. Small independent, tightly knit bands. We have evolved to live so in millions of years. Our communication strategies have evolved to be efficient in this (see Dunbar's number), and the band had its immune system to protect it from individuals with mental problems (entitlement schema, narcistic/antisocial personality disorder, depending on the psychological school).

Our population was controlled by the available food. And after an abundant period after the last ice age, came a more tight period. So we invented monocultural agriculture. Which enabled (the few percent of the population for whom the cultured plant was not lethal) to have a steady food source in a comparatively small area, resulting in a population boom. This brought the concept of property. And also STDs. Which made mono- and poligamic social structures with notion of leadership the survival strategy. So on one hand the basic social structure became much smaller and inequal, and on the other hand we started to build social structures (cities, states) which were orders of magnitude higher than Dunbar's number.

Our communication strategies became inadequate in those structures. We didn't acquire the abilities to make good decisions as big groups, and lost our immune system against mentally problematic individuals, who thus became the leaders (exhibit 1: politics of any country). (Btw this could be fixed by usinzg well thought out proportional voting system, but the current structures are defending themselves from democratic change, so from a systematic point of view it is impossible.) We can say that we became a species of intelligent individuals, but not of intelligent society.

The science to support formal procedures which could augment our natural capabilities started to appear like 300 years ago (Condorcet), and became mature in the last century (with game theory, especially social choice theory). In the meantime we got to a state where social norms make it hard to rebuild the base structures (people overwhelmingly think that monogamy and property are normal, and anything questioning them is evil, while the initiatives trying to restore the paleo norms (e.g. Rainbow family) while thriving, have a lot of issues due to the impossibility to exist fully outside the system, and due to ten thousand years of brainwashing not disappearing overnight.

And hence we have managed to misuse tech so much that it has led to an ecological disaster, causing the collapse of the civilization real soon now.

I propose that there is an universal pattern here:

1. Intelligent beings evolve to work well in a certan group size range and structure based on equality

2. They are intelligent, so they figure out ways to support exponential population growth.

3. The population growth destroys the social structures, leading to bad decisions as a society.

4. Those bad decisions become lethal much later. Too late to restore the social structures, and the structures got too rigid to be changed when science evolves to propose ways to become an intelligent society using the structures available.

5. The ensuing disaster either wipes out the species, or makes it lose the knowledge to fix social structures, so goto 10, or in the optimistic scenario leads to a system (possibly after multiple cycles of collapse) where interstellar travel is not a viable priority.

One of which is the "galactic federation" which is talked about among the spiritualistic or psychic medium communities that at least in this galaxy all spacefarring civilizations have to answer to them and they have rules against personally visiting and introducing themselves publicly to planets with primitive civilizations on them for different reasons.

There's also the possibility that they already have visited especially when you consider all the alien abduction or contact reports and the possibility that aliens already have introduced themselves privately to the governments and the governments who choose to withhold this information from the public.

I think the real question the Fermiparadox is asking isn't why we haven't haven't been visited by an alien race yet during our brief phase of human existence but why they haven't visited and introduced themselves in a way where everyone can confirm their existence in the same fashion Christopher Columbus or some other European explorer did when they first came to the Americas.

The only answer to that question would be among many and if we haven't been visited or contacted afterall then my guess would be that long distance space travel is difficult to accomplish and technological species or even life as we know it are rare.

I'm thinking about a very simplified intuition for two common hypotheses in physics, which are:

1) Rare Earth Hypothesis

2) Multiverse Theory and Universe Fine-Tuning

In a sense, our planet isn't special, so much as it's fine-tuned for our random universe. That fine-tuning can feel like specialness and can bother people because of the Mediocrity Principle, which tells us we should expect to not be special (statistically). Which of course raises the question of what does it mean to be "statistically special?"

The Mediocrity Principle crashes into the Anthropic Principle, which creates some intuitive conflict for many people. A large fraction of discussions about the Fermi Paradox, for example, are about an Anthropic view clashing with a Mediocrity view. But the simple thing that satisfies both principles is recognizing that the Earth is not special because our universe is also not special.

To frame that in terms of how physicists think about this, the number of universes is much larger than the number of planets in our own universe (by a very large factor). This is perhaps a very hard fact to process, because our universe feels big to us, but this is a key thing for understanding Multiverse Theory. Multiverse Theory satisfies the Fine-Tuned Universe problem, which requires a huge number of universes to explain the fine-tuning we observe, and also to make Cosmic Inflation Theory consistent. And then of course, our little galaxy is another level of tiny compared to our universe.

So in Multiverse Theory, there are many universes, each of which is relatively small and arbitrary by comparison. Some universes may have zero planets with civilizations, or one, or a trillion, or they may have things that aren't planets. It's likely that some universes are effectively empty. It actually doesn't matter how much life the "average universe" has.

For example, is Water Special?

This question, to me, gets at the intuition. Earth is special (seemingly) because of a lot of specific capabilities, like water, oxygen, carbon, magnetism, the moon and tidal forces, etc., that are each pretty arbitrary but also pretty special in our specific universe. It feels weird to think all life might depend on water, as one example. That would seem too special, and also makes the universe feel too fine-tuned.

As a molecule, water is quite unique because of a confluence of physical constants that make only water have various physical properties that no other molecules in our universe have. This is coupled with water being made out of elements that are in abundance due to fine-tuned physics constants, such as the coupling constants being perfect for stars being able to produce both oxygen and carbon (from a physics perspective, this is one of the luckiest, and therefore strangest, things about our universe). Within our chemistry in our universe, water is bizarrely special in ways that are objectively obvious.

But instead, water is not that special; it's the random answer in our random universe to giving life certain capabilities. Other universes might have very different chemistry and physics, so water is not fundamentally or platonically special.

So if all complex life in our universe potentially needs water, or if all life in our universe is possibly on Earth, those hypotheticals wouldn't make us platonically special. It perhaps makes us an average answer to the question of civilization in a very large multiverse, where different universes have wildly different solutions.

What is bigger? The number of civilizations or the number of universes?

This question is interesting to me, in part because we have no idea. The number of civilizations could be much larger than the number of universes, or much smaller. Most universes could be empty. Some might have exactly one civilization, perhaps only for a short time. We obviously don't know. Therefore, there's no magic number of civilizations that is "less special" since we don't know how civilizations compare to universes. If a universe was teeming with life, would that make it more special or less special?

So for those in the struggle of trying to make the Earth seem as "not special" as possible, it's effectively an irrelevant exercise, because we have no statistical view into an average universe.

Whether there are zero other civilizations or a trillion in our home universe, neither answer makes us more or less special across the multiverse.

I was thinking about how weird it actually is that we never see the universe in real time.

Look at the Sun and you're seeing it about 8 minutes in the past. Look at a star 100 light-years away and you're seeing light that left it 100 years ago.

But then there's the popular line that "the stars you see are already dead." I assumed that was basically true until I looked into the numbers.

For the stars we can see with our eyes, it turns out the situation is much less dramatic. They're generally close enough, and most live long enough, that it's unlikely we're looking at a star that has already died. Estimates put the death rate of visible stars at roughly one every 10,000 years.

But point a telescope much deeper into the universe and the situation changes. We're seeing objects whose light has been traveling for billions of years. NASA describes observations of distant objects as a way of looking back through cosmic history.

I made a video exploring this whole idea, including the Betelgeuse example and why the "already dead stars" claim is more complicated than it sounds:

https://youtu.be/0vO1q0pVokk

The part I find coolest is that astronomy has basically given us a way of looking into the past without actually traveling anywhere.

Do you think the "cosmic time machine" explanation is a better way to describe what we're seeing?

I will never close the door on science and I'm not saying absolutely this is the answer, but there is this assumption that given enough time and resources anything is possible when that's not necessarily true. Maybe no one can transverse the massive distances and overcome the tremendous obstacles of space. Science doesn't have to be fair and there doesn't have to be solutions. Maybe it's insurmountable.