Scientist Says Galaxies Shining With Radio Signals Could Indicate Numerous Advanced Civilizations

"While many theories have been put forward in response to the paradox, many experts believe that it's only a matter of time until we can detect alien signals. In fact, as Breakthrough Listen Initiative astronomer Brian Lacki suggests, the universe could be teeming with billions of extraterrestrial intelligences (ETIs) - and, in a striking claim, all that activity just might explain "radio bright" active galaxies that emit powerful radio emissions"

"In a series of three yet-to-be-peer-reviewed papers, first spotted by Universe Today, Lacki raised the possibility that galaxies "blazing with technosignatures" could suggest the existence of a "large number" of "different metasocieties" sending broadcasts across the radio spectrum. Basically, the idea is that alien civilizations might be rare - but that once one has attained a certain level of technological capability, it's likely to expand or seed elsewhere within its galaxy."

""If interstellar travel and migration are indeed possible, then ETIs are unlike known astrophysical phenomena in that they can reproduce," he wrote in his first paper. "Replication can amplify quirks of history onto galactic scales." "Thus, supposing that starfaring ETIs are rare, one galaxy could have no ETIs while another, astrophysically indistinguishable, could have billions of inhabited worlds," he added. "This motivates the use of a probabilistic treatment of the observable technosignatures of galaxies, wherein different galaxies can have wildly different broadcast distributions.""

The Fermi Paradox questions why no alien civilizations have been detected despite many habitable planets. Many experts anticipate detection of alien signals as technology and surveys improve. Galaxies emitting strong radio signals could be explained by widespread broadcasts from numerous extraterrestrial intelligences. Starfaring civilizations capable of interstellar travel can reproduce and spread, potentially seeding many worlds within a galaxy and amplifying historical contingencies to galactic scales. This can produce extreme variation between galaxies, with some hosting billions of inhabited worlds and others none. A probabilistic approach to galactic technosignatures and constraints on radio broadcasts across galaxy populations can improve detection strategies.

Read at Futurism