@ahoernchen

Danke, dass muss auch der @silberspur zum #FermiParadox sehen! 👆 Er hat dazu & zum #Fossilismus just heute Morgen hier auf dem #Blog klug kommentiert.

@MontyRunner

https://scilogs.spektrum.de/natur-des-glaubens/franz-neumann-1900-1954-und-die-oel-obsession-der-nationalsozialisten/

#AIslop is the reason why the #FermiParadox holds true. Every technological civilization eventually develops #LLM #Slop and pollutes its knowledgebase, causing it to self-destruct and collapse, so technological civilizations never last long enough to be detectable by other technological civilizations.

Two videos where #BrianCox and Cool Worlds talk about the #FermiParadox
#Aliens #ExtraterrestrialIntelligence http://youtube.com/watch?v=dTjgrG2UY30&feature=youtu.be http://talkwards.com/2025/12/13/two-videos-on-the-fermi-paradox/

Weekly Update from the Open Journal of Astrophysics – 06/12/2025

Once again it’s time for the usual Saturday morning update of the week’s new papers at the Open Journal of Astrophysics. Since the last update we have published a further six papers, which brings the number in Volume 8 (2025) up to 190, and the total so far published by OJAp up to 425. I blogged about the significance of the latter figure here.

The first paper this week is “The galaxy-IGM connection in THESAN: observability and information content of the galaxy-Lyman-alpha cross-correlation at z>6” by Enrico Garaldi (U. Tokyo, Japan), Verena Bellscheidt (Tech. U. Munich, Germany), Aaron Smith (U. Texas Austin, USA) and Rahul Kannan (York U. Canada). This paper was published on Monday 1st December 2025 in the folder Cosmology and Nongalactic Astrophysics. It describes an investigation of the impact of observational limitations on the ability to retrieve the intrinsic galaxy-Lyman-alpha cross correlation from line-of-sight observations.

The overlay is here:

You can find the officially accepted version on arXiv here and the Fediverse announcement is here:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "The galaxy-IGM connection in THESAN: observability and information content of the galaxy-Lyman-alpha cross-correlation at z>6" by Enrico Garaldi (U. Tokyo, Japan), Verena Bellscheidt (Tech. U. Munich, Germany), Aaron Smith (U. Texas Austin, USA) and Rahul Kannan (York U. Canada)

https://doi.org/10.33232/001c.151666

The second paper of the week is “A Less Terrifying Universe? Mundanity as an Explanation for the Fermi Paradox” by Robin H.D. Corbet (U. Maryland, USA). This paper was published on 1st December 2025 in the folder Instrumentation and Methods for Astrophysics. It presents a discussion of possible explanations for the lack of s evidence for the presence of technology-using extraterrestrial civilizations in the Galaxy (usually called the Fermi paradox). The overlay is here:

You can find the official version of this one on arXiv here. The federated announcement on Mastodon is here:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "A Less Terrifying Universe? Mundanity as an Explanation for the Fermi Paradox" by Robin H.D. Corbet (U. Maryland, USA)

https://doi.org/10.33232/001c.151454

Next one up is “Sulphur abundances in star-forming regions from optical emission lines: A new approach based on photoionization models consistent with the direct method” by Enrique Pérez-Montero, Borja Pérez-Díaz, & José M. Vílchez ( (Instituto de Astrofísica de Andalucía, Spain), Igor A. Zinchenko (LMU, Germany), Asier Castrillo, Marta Gavilán, Sandra Zamora & Ángeles I. Díaz (Universidad Autonoma de Madrid, Spain). This was published on 1st December 2025 in the folder Astrophysics of Galaxies. This study uses the emission lines produced in the optical part of the spectrum and with photoionization models to derive sulphur chemical abundances in the gas-phase of star-forming galaxies.

The overlay is here:

You can find the official accepted version on arXiv here. The fediverse announcement is here:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "Sulphur abundances in star-forming regions from optical emission lines: A new approach based on photoionization models consistent with the direct method" by Enrique Pérez-Montero, Borja Pérez-Díaz, & José M. Vílchez ( (Instituto de Astrofísica de Andalucía, Spain), Igor A. Zinchenko (LMU, Germany), Asier Castrillo, Marta Gavilán, Sandra Zamora & Ángeles I. Díaz (Universidad Autonoma de Madrid , Spain)

https://doi.org/10.33232/001c.151253

The fourth article of the week is “Bayesian Posteriors with Stellar Population Synthesis on GPUs” by Georgios Zacharegkas & Andrew Hearin (Argonne National Laboratory, USA) and Andrew Benson (Carnegie Observatories, USA). This is an exploration of a range of computational techniques aimed at accelerating Stellar Population Synthesis predictions of galaxy photometry using the JAX library to target GPUs (Graphics Processing Units, in case you didn’t know). This paper was published on Tuesday December 2nd 2025 in the folder Astrophysics of Galaxies.

The overlay is here:

You can find the official published version on arXiv here. The Fediverse announcement follows:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "Bayesian Posteriors with Stellar Population Synthesis on GPUs" by Georgios Zacharegkas & Andrew Hearin (Argonne National Laboratory, USA) and Andrew Benson (Carnegie Observatories, USA)

https://doi.org/10.33232/001c.151255

Next one up is “IAEmu: Learning Galaxy Intrinsic Alignment Correlations” by Sneh Pandya Yuanyuan Yang, Nicholas Van Alfen, Jonathan Blazek and Robin Walters (Northeastern University, Boston, USA). This presents a neural-network-based emulator that predicts the galaxy position-position, position-orientation, and orientation-orientation, correlation functions and their uncertainties using mock catalogs based on the halo occupation distribution (HOD) framework. It was published on December 2nd 2025 in the folder Cosmology and Nongalactic Astrophysics. The overlay is here:

The official accepted version can be found on arXiv here. The Mastodon announcement is here:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "IAEmu: Learning Galaxy Intrinsic Alignment Correlations" by Sneh Pandya Yuanyuan Yang, Nicholas Van Alfen, Jonathan Blazek and Robin Walters (Northeastern University, Boston, USA)

https://doi.org/10.33232/001c.151749

The last paper for this weel is “Unraveling the Nature of the Nuclear Transient AT2020adpi” by Paarmita Pandey (Ohio State University, USA) and a team of 15 others based in the USA, UK and Australia. This was published on Thursday December 4th 2025 in the folder High-Energy Astrophysical Phenomena. It is an investigation into a particular transient event AT2020adpi and a discussion of whether it is an extreme example of AGN variability or a Tidal Disruption Event (TDE). The overlay is here:

You can find the officially-accepted version on arXiv here, and the Mastodon announcement is here:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "Unraveling the Nature of the Nuclear Transient AT2020adpi" by Paarmita Pandey (Ohio State University, USA) and 15 others based in the USA, UK and Australia

https://doi.org/10.33232/001c.151453

And that concludes the update for this week. I will do another next Saturday.

#arxiv241002850v2 #arxiv250405235v4 #arxiv250614736v2 #arxiv250619919v2 #arxiv250903593v3 #arxiv250922878v2 #astrophysicsOfGalaxies #at2020adpi #bayesianMethods #cosmologyAndNongalacticAstrophysics #diamondOpenAccessPublishing #fermiParadox #gpus #highEnergyAstrophysicalPhenomena #instrumentationAndMethodsForAstrophysics #intrinsicAlignments #lymanAlpha #machineLearning #nuclearTransient #openAccessPublishing #openJournalOfAstrophysics #photoionization #seti #starFormation #stellarPopulations #suplhur #theOpenJournalOfAstrophysics #thesanSimulations

The life on earth began 3.5 billion years ago and the world is likely to support life for another 1.75 billion years if nothing happens disastrously, like a big asteroid impact. So the whole period is 5.25 billion years in the case of our planet. We have been sending radio signals for about 100 years. Many people will agree that humans are on a fast track towards their extinction, towards being a part of "the great silence". In that case, out of 5.25 billion years, there will be 100 years during which we will have sent radio signals to the outer space. That makes 1 / 52,500,000 of its time. So if those aliens ever reach a technological level to send interstellar signals and then share our fate, what is the probability of a coincidence where two civilizations will exist at the exact period where one would be able to detect the other's signals?

#civilization #extraterrestriallife #fermiparadox #greatsilence

"We have every reason to believe that life exists in the universe and yet we can't find a single sign."

This idea assumes that when there is life somewhere, it will eventually evolve into species with symbolic behavior, their population will increase, specialization will occur, those species will try to communicate with other life forms beyond space, and their civilization will continue a long time. Why don't we discuss the following? What is the probability of an existence of life in an astronomical body? What is the probability of an evolution leading to a symbolic behavior in similar situations to ours? If that ever occurs, how long will they exist until their extinction?

#civilization #aliens #fermiparadox

@steter
RE
🔵look for #AlienTechnology on the #Moon (not in #asteroids)

⭕"self-replicating #interstellarprobe that may have visited our solar system"
⭕"asteroidal processing, difficult...given constraints imposed by self-replication"
⭕"the Moon is an ideal base of manufacturing operations"
⭕"nuclearreactors...can be constructed from lunar resources which left isotopic ratio signatures"

❌No way, #FermiParadox
❌"Where is everybody?" 🤕 The aliens died maybe from advanced nuclear advancement

Solving #TheFermiParadox:
https://gizmodo.com/our-universe-is-getting-colder-deader-astronomers-say-2000683693

We're just too late. We took too much time messing around with Dinosaurs and Hadean Impacts. We missed everything. They've been and gone. We are alone in a dying and decaying universe.

Good Morning, everyone, how are we all feeling on this wonderful Tuesday?

#Aliens #FermiParadox

Ha ha I have been thinking this about the #fermiParadox most of this year.
https://bsky.app/profile/smbccomics.bsky.social/post/3m4w7eb37hn23

Whichever way you cut the logic.

We can either have dumb #AI
or Smart, motivated AI that sooner or later will compete with biologicals.

The #FermiParadox is the biologicals giving birth to #AGI and #ASI then being discarded, like the shell of an egg...

@cstross

This is how I learn that not only did someone make a movie about Nazis living on the moon, they even made a sequel.

#FermiParadox #Luna

A visitor from another star system, 3I/ATLAS, is currently journeying through our celestial neighborhood.

My latest article explores this fascinating thought experiment: What if we detected a signal from 3I/ATLAS, encoded in the Fibonacci sequence—the mathematical blueprint of life itself?

Read: https://blog.subhrachakraborti.com/2025/10/3i-atlas-cosmic-mystery-and-faith.html

#SpaceExploration #Astronomy #SETI #3IATLAS #Interstellar #ScienceAndSpirituality #Fibonacci #Cosmology #FermiParadox #ET #Extraterrestrial #NASA #JAXA

@jbz I think the simple issue here is that humans are unable to comprehend the vastness of space between the stars, how much time it would take to travel between them, and how much energy would need to be inefficiently thrown off in order to be detected by others.

The #FermiParadox should be the Fermi Common Sense.

👽 ‘Bored aliens’: has intelligent life stopped bothering trying to contact Earth? / The Guardian

“The idea is that they’re more advanced, but not much more advanced. It’s like having an iPhone 42 rather than an iPhone 17,”

https://www.theguardian.com/science/2025/oct/15/bored-aliens-has-intelligent-life-stopped-bothering-trying-to-contact-earth

#aliens #fermiparadox

Fermi’s Paradox: Mammals?

Milk.

• Insects? Nope.
• Fish? Nope.
• Reptiles? Nope.
• Birds/dinosaurs? Nope.

Premise: I hold that mammalian, or its analog, reproduction and rearing are one more “flip of a coin landing heads” in the explanation and resolution of Fermi’s Paradox.

That the other methods of progenation do not provide the necessary environment for the generational transfer of information required to evolve an intelligent much less electromagnetic energy manipulating species (us).

In review, the “~70+ coin flip” theory states that humanity, in its current form and technological capability, is the theoretical result of at least seventy coin-flips ALL of them landing heads. The odds of such an occurrence being 1/2^70, or one out of approximately one sextillion (1/1,000,000,000,000,000,000,000). And given such a rarity of events that it’s no wonder why we don’t see or have never discovered evidence of extraterrestrials, e.g. aliens. We are alone.

A quick aside: The concept of flipping coins to arrive at a probability of our uniqueness follows this logic:

• We are the only example of intelligent life that we know of.
• Analyzing how we came to be is our only realistic means to determine how rare we are.
• Each factor that contributed to our existence can be represented by one or more binary choices, coin flips.
  • For example: What percentage of stars in the Universe (extrapolating our galaxy) are singular G2V yellow dwarf stars (our Sun)? (A sun we KNOW can support life on its satellite planets.)
  • Answers vary, but approximately 10 percent is a reasonable compromise.
  • What is 10% in coin flips that all land heads?
  • One coin landing heads: 50%. Two? = 25%. Three? = 12.5%.
  • 12.5 percent is close enough to our 10 percent so we’ll accept that conservative number.
  • So, to get us living around a life-sustaining star we flipped 3 coins, all landing heads.
  • I propose there are 67+ additional factors that, added up, become our 2^70 “all heads”. (Goldilocks zone, gas giants protecting Earth, the planet Thiea providing the Moon, Earth’s tilt (seasons), and dozens of others. I have a list here somewhere…)
  • Yes, life might exist around other types of star systems, but we don’t know that. We only know of one example. This is the point of analyzing our existence.

OK, now, where were we? Milk. That’s right.

Neil deGrasse Tyson is wont to point out that “technologically intelligent life, as we know it, arose only once on the Earth.” In the hundreds of millions of years that life has had the chance to create intelligence, across billions of species, it’s only happened once. With this in mind…

I propose that all egg-laying species, where even if the parents nurture, for a time, their offspring, that the ability to evolve an intelligent species is limited if not impossible. That innate behavior, transferred genetically, is inadequate to create higher intelligence, despite there being some species where the parent(s) spend some time “teaching” their progeny. The information transfer will always be insufficient, and information transfer is key.

So, all egg layers, the dominate earthly reproduction method, will never generate a technologically intelligent species. Eggs are great for quantity, but not quality, at least when it comes to smarts. Sure, some birds attentively rear fledglings but only for a few months. Not nearly long enough to transfer adequate information.

On to mammals and the need for nursing, nurturing and extended behavior and information exchange.

Another aside: Speaking of placental birth and whether that impacts this theory… Placental birth reduces the quantity, but up’s the quality of offspring and their ability to jumpstart life. This is crucial as well. And there are a few non-mammals that give birth to live offspring, some snakes, lizards, and sharks. But none of those perform any secondary care post birth; “out you go” and “you’re on your own.”

Focusing on human offspring and their feeding and rearing, we know that infants are utterly dependent on their parents, mother directly and father indirectly. That the placental birth of a human, one with features that render the child incapable of mobility, self-feeding, or even environmental awareness, instill the need for intimate care in the parents. That humans as mammals provides for the tight bonding between mother and child through nursing which then sets up the transfer of information, both cultural and that of survival, which then establishes humans as a species that arrives incomplete but with substantial potential.

And as a mammal, and the integral feeding via mammary glands resulting in a fierce protectionist and educational relationship, only a mammalian species like humans could ever evolve to the technological intelligence that we enjoy today. Higher intelligence requires vast amounts of information to be delivered into the minds of offspring, information that cannot be genetically transferred.

Phew! That’s a lot of words for a coin flip.

Bottomline: humans as mammals, living on a planet that revolves in the habitable zone around a G2V star, in an outer arm of the spiral Milky Way Galaxy are excruciatingly special, in the grand scheme of things. Fermi’s Paradox, “where are all the aliens?” is not a paradox if we establish how rare our existence really is.

#fermiParadox #mammals

New solution for the #FermiParadox: We don't see signs of alien life because political corruption makes leaving signs impossible. (c t)

https://sailing-dulce.nl/home/article-9050 #ASKAPJ18320911 #FermiParadox #Shutdown2025 #cosmicinflation #alanguth Maandag 20-10-2025 Het is af en toe irritant hoezeer alarmisme hoogtij viert op de (sociale) media. Veel nieuws wordt opgeklopt en aanzienlijk spectaculairder gemaakt dan het verdient. Dat trekt lezers en is goed voor de oplage, de hits en de kijkcijfers. Soms check ik het, speciaal als het om fysica of astronomie gaat. In 99,9 procent van de gevallen is er niks bijzonders aan de hand. Het bericht..

New paper: aliens aren’t gods—just wifi-blind neighbors with the same lag. The silence? Mutual buffering. #FermiParadox
https://gizmodo.com/where-are-the-aliens-new-study-suggests-theyre-stuck-like-us-2000672801

(15 Oct) Where Are the Aliens? New Study Suggests They’re Stuck Like Us https://s.faithcollapsing.com/zhjxt #aliens #extraterrestrials #fermi-paradox #seti #space-&-spaceflight