40
The answer to the The Fermi Paradox could be that space is full of dead aliens
(www.livescience.com)
this post was submitted on 09 Nov 2025
40 points (97.6% liked)
Space
9127 readers
37 users here now
News and findings about our cosmos.
Subcommunity of Science
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
founded 4 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
I've seen this sort of "solution" to the Fermi Paradox proposed a lot, and I have yet to ever see it satisfactorily answer the obvious and necessary followup: "How?" Once a technological species has become spaceborne and distributed itself over multiple solar systems, what actual mechanism would be capable of wiping it all out?
The paper this article links to just assumes a "probability of self-annihilation" without actually addressing the "how" beyond some vague "maybe war or climate change or something" (note that these things would be completely meaningless to a civilization capable of colonizing other solar systems). They might as well have substituted a "probability of being eaten by grues" in the equation instead.
Is that really such a strange perspective? Surely you must accept the idea that even without knowing every possible mechanism of death, the probability of death for every lifeform we have ever encountered approaches 100% over time.
We're not talking about individual lifeforms, though. We're talking about technological species and ecospheres spread across multiple independent habitats. And none of those that we know about have ever gone extinct before. A mechanism is required before this is a complete theory, let alone a plausible one.
We don't have evidence that civilizations on other worlds exist at all, but you are saying we should be working under the assumption that these things we don't have evidence for can't self-eradicate?
No. I'm saying that you can't use evidence of some particular thing happening to support a theory that requires something completely unrelated to happen. It's simply not a valid argument.
I'm simply saying that if someone wants to propose that the solution to the Fermi Paradox is that interstellar civilizations quickly perish and never rise again, it kind of behooves them to include a mechanism for how those civilizations perish. We've never seen it happen so there's nothing that can be assumed here. Step two needs to be made explicit.
They're essentially making the argument that if you accept that a civilization can eradicate itself (via nuclear war, climate change, plague, a generation of ipad kids, etc etc) even if you calculate that chance of eradication to be infinitesimally small, then given cosmic time scales it becomes a near inevitability.
But if you choose to believe (without evidence) that an interstellar civilization exists that definitionally can't be eradicated by any means then yes, definitionally that civilization will persist.
That's exactly the "step two" that I'm challenging, though. That's my entire point. I don't accept that civilizations like these can eradicate themselves without some further work to establish that.
None of those are plausible ways to reliably wipe out an interstellar-capable civilization. Especially bearing in mind that "wiping out" in the Fermi Paradox context requires that they be wiped out such that they can never recover. Full blown permanent and total extinction. Something that merely knocks them back to the stone age is no biggie on the sort of timescales the Fermi Paradox operates on.
I'm pointing out that the "answer to the Fermi Paradox" that these researchers are presenting is incomplete in a very fundamental way. It's like proposing an explanation for why the Sahara Desert is dry by calculating how frequently you'd need flying saucers to come and steal all the water from it, but not doing any work to establish that there are flying saucers coming to steal all the water. An interesting exercise in playing with probability equations, perhaps, but not a useful one.