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It has been widely acknowledged that self-replicating space-probes (SRPs) could explore the galaxy very quickly relative to the age of the galaxy. An obvious implication is that SRPs produced by extraterrestrial civilizations should have arrived in our solar system millions of years ago, and furthermore, that new probes from an ever-arising supply of civilizations ought to be arriving on a constant basis. The lack of observations of such probes underlies a frequently cited variation of the Fermi Paradox. We believe that a predilection for ETI-optimistic theories has deterred consideration of incompatible theories. Notably, SRPs have virtually disappeared from the literature. In this paper, we consider the most common arguments against SRPs and find those arguments lacking. By extension, we find recent models of galactic exploration which explicitly exclude SRPs to be unfairly handicapped and unlikely to represent natural scenarios.
We also consider several other models that seek to explain the Fermi Paradox, most notably percolation theory and two societal-collapse theories. In the former case, we find that it imposes unnatural assumptions which likely render it unrealistic. In the latter case, we present a new theory of interstellar transportation bandwidth which calls into question the validity of societal-collapse theories.
Finally, we offer our thoughts on how to design future SETI programs which take the conclusions of this paper into account to maximize the chance of detection.
Fermi Paradox paper on Arxiv http://arxiv.org/abs/1111.

Von Neumann Self-Replicating Probes. Percolation Theory, Interstellar Societal Collapse, ETI May Still Exist in our Galaxy.

==Conclusion==
This paper was arranged in three parts. First, we introduced SRPs, presented the prevalent arguments against them, and showed that such arguments leave room for future SRP consideration. Namely, we proposed that recent literature has been overzealous in its exclusion of SRPs and we encourage their return to the field.
Second, we presented percolation theory and its nonsociological explanation for the Fermi Paradox. We then showed that the theory can be extended in very reasonable ways which.
undermine its primary conclusion that galactic expansion might.
be intrinsically bounded.
Third, we reviewed two theories of interstellar societal collapse and showed a few counter-arguments to each theory. Furthermore, we introduced ITB theory and showed that its implications might suggest a fundamental error in such theories.
We then discussed one additional paper theorizing that interstellar societies shrink back to their homeworlds and explained that the model involves a number of unlikely assumptions. Following this final analysis, we described the best theory yet oered on the Fermi Paradox which permits intragalactic ETI, namely that exploration probes may currently reside in our solar system, yet undiscovered. Lastly, we offered our thoughts on how to design future SETI programs so as to maximize the likelihood of success.

http://keithwiley.com/

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In this video, Unveiled takes a closer look at Liu Cixin’s Dark Forest theory!

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Could aliens destroy us from light years away? Another day at Kurzgesagt Labs, where we answer the most important questions with science.
Today: how might civilizations wage war across light years? What kind of devastating weapons could they use and what would they look like?

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Hubble Finds Two Exoplanets Covered in Oceans 1,000 Miles Deep, Possibly Hiding Exotic Forms of Life.

Using data from the Hubble telescope, scientists have discovered two exoplanets, Kepler-138c and Kepler-138d, which appear to be “water worlds” with oceans potentially as deep as 1,000 miles. These planets, located 218 light-years away, are unlike any in our solar system, with low densities suggesting that they are primarily composed of water. Though they may not have surface oceans like Earth, the atmosphere on these planets could be made of steam, with high-pressure liquid water existing beneath. This breakthrough raises new questions about the habitability of exoplanets.

NASAs SPHEREx observatory will lend insight into what happened after the Big Bang, measure the glow of galaxies near and far, and search the Milky Way for building blocks of life.

NASA and SpaceX are planning to launch the SPHEREx astrophysics observatory in late February 2025. SPHEREx, which stands for Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer, will lift off aboard a SpaceX Falcon 9 rocket from Vandenberg Space Force Base in California.

Roughly the size of a subcompact car, SPHEREx will enter a polar orbit around Earth. From there, it will map the entire sky in 3D by capturing images in every direction, similar to scanning the inside of a globe. The resulting map will feature hundreds of millions of stars and galaxies, displayed in 102 distinct colors, each representing a unique wavelength of light.

An Iranian cosmologist has recently suggested another way we could look for extraterrestrial life in our universe. Could it be, he wonders in a new paper (which appears now on the preprint site arXiv), that these advanced alien civilizations are using Dyson spheres around primordial black holes as a way to gather energy? And, if so, how could we look for the signs? His work makes some big assumptions that may not be justified, but this specific type of cosmology has always been a little far out—and it’s where the biggest insights can sometimes lie.

Shant Baghram is a physicist at the Sharif University of Technology in Tehran. His new paper, which is an unusual solo work in a long career of collaboration with colleagues and graduate students, is a quick-and-dirty introduction to ideas like SETI (the Search for Extraterrestrial Intelligence), the Drake equation, and the Dyson sphere—all hallmarks of those who theorize about alien civilizations.