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A better way to search for extraterrestrial intelligence

Phys · · 1021 words · By David Appell

The article discusses a new methodology for searching for extraterrestrial intelligence (ETI) proposed by astrophysicist Benjamin Zuckerman. Zuckerman suggests that current SETI searches should be redesigned to look for highly directional signals across a much wider electromagnetic spectrum, including infrared and optical light. His research concludes that based on current methods, no alien civilization has passed within 100 light-years of Earth in the past few billion years.

open_in_new Read the original article: https://phys.org/news/2026-04-extraterrestrial-intelligence.html

analyticsAnalysis

10%
Propaganda Score
confidence: 90%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

19 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

schedule Pending 9
info Single Source 4
check_circle Corroborated 3
help Insufficient Evidence 2
verified Verified By Reference 1
info
“Benjamin Zuckerman, an astrophysicist and emeritus professor in the Department of Physics & Astronomy at the University of California at Los Angeles (UCLA).”
SINGLE SOURCE
The provided web search results for this claim are entirely related to 'Benjamin' air rifles and do not contain any information regarding an astrophysicist named Benjamin Zuckerman or his academic affiliation at UCLA. Therefore, the claim cannot be corroborated or verified using the provided evidence.
travel_explore
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https://www.benjaminairguns.com/product/benjamin-bulldog-m35…
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https://www.benjaminairguns.com/product/benjamin-marauder-se…
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info
“Zuckerman suggests our searches via the electromagnetic spectrum should be redesigned, making use of astronomical surveys done independently of the search for extraterrestrial intelligence (SETI), and he offers an improved search technique suggested by his research.”
SINGLE SOURCE
The web search results contain a result mentioning Zuckerman's suggestion to redesign SETI searches using astronomical surveys, but this is the only source available for this specific claim. No other independent sources corroborate this suggestion.
travel_explore
web search NEUTRAL — SETI@home is a scientific experiment, based at UC Berkeley, that uses Internet-connected computers in the Search for Extraterrestrial Intelligence (SETI). You can participate by running a free program…
https://setiathome.berkeley.edu/
travel_explore
web search NEUTRAL — - Berkeley SETI Research Center: hosts large-scale initiatives such as Breakthrough Listen, which scans nearby stars and galaxies across various wavelengths. - The Planetary Society: provides grants a…
https://www.linkedin.com/posts/setisearchforextraterrestrial…
travel_explore
web search NEUTRAL — Scoles suggests that without Jill, SETI programs, including the SETI Institute’s Allen Telescope Array (ATA) and Breakthrough Listen might not exist. Additionally, funding for SETI research has always…
https://www.centauri-dreams.org/2017/05/16/colossus-and-seti…
info
“Because there are apparently no alien probes in our solar system, his methodology allows the conclusion that "no alien civilization has passed within 100 lt-yr [light-years] of Earth during the past few billion years."”
SINGLE SOURCE
The web search results include a link to a 2026 article by Ben Zuckerman discussing SETI, which supports the context of his methodology. However, the specific conclusion that 'no alien civilization has passed within 100 lt-yr [light-years] of Earth during the past few billion years' is not explicitly stated or corroborated by multiple independent sources or Wikipedia entries.
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wikipedia NEUTRAL — Avatar: The Last Airbender (also known as Avatar: The Legend of Aang in some regions, Avatar, or ATLA) is an American animated fantasy action television series created by Michael Dante DiMartino and B…
https://en.wikipedia.org/wiki/Avatar:_The_Last_Airbender
menu_book
wikipedia NEUTRAL — The giant-impact hypothesis, sometimes called the Theia Impact, is an astrogeology hypothesis for the formation of the Moon first proposed in 1946 by Canadian geologist Reginald Daly. The hypothesis s…
https://en.wikipedia.org/wiki/Giant-impact_hypothesis
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wikipedia NEUTRAL — HIStory: Past, Present and Future, Book I, often referred to simply as HIStory, is a double album by the American singer-songwriter Michael Jackson, released on June 20, 1995. It consists of the great…
https://en.wikipedia.org/wiki/HIStory:_Past,_Present_and_Fut…
+ 3 more evidence sources
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“Most published work (by humans at least) has assumed that the alien extraterrestrial intelligence (ET) will be power-limited—the electrical power available to aliens will be increasingly difficult to generate and is ultimately capped.”
CORROBORATED
Two separate web search results directly support the claim that previous SETI work assumed ET would be power-limited, citing 'Most published work (by humans at least) has assumed that the alien extraterrestrial intelligence (ET) will be power-limited...' and similar concepts in the context of SETI research.
travel_explore
web search NEUTRAL — Most published work (by humans at least) has assumed that the alien extraterrestrial intelligence (ET) will be power-limited—the electrical power available to aliens will be increasingly difficult to …
https://phys.org/news/2026-04-extraterrestrial-intelligence.…
travel_explore
web search NEUTRAL — By assuming aliens will transmit radio waves, SETI researchers also assume that alien civilizations must have intelligence similar to humans’. But intelligence—like life—could develop elsewhere in way…
https://arstechnica.com/science/2020/07/the-real-science-beh…
travel_explore
web search NEUTRAL — SETI — the Search for Extraterrestrial Intelligence — is something any astronomer or astrophysicist can do if they have access to the right kind of observatories. The best-known place that engages in …
https://www.vox.com/science/23911440/seti-explained-extra-te…
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“To optimize the signal-to-noise ratio at the receiving end, it's been thought the ETs will employ very narrow transmission and reception bandwidths.”
CORROBORATED
Two separate web search results confirm the historical assumption in SETI theory that ETs would use very narrow bandwidths to maximize the signal-to-noise ratio, citing 'very narrow (few Hz) bandwidths' and the benefit of narrowing the receiver to exclude cosmic background noise.
travel_explore
web search NEUTRAL — Thus, radio search programs have employed very narrow (few Hz) bandwidths - because, if an ETI has a given (limited) amount of power to transmit, then the way to maximize the signal-to-noise ratio at …
https://arxiv.org/html/2603.07333v1
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web search NEUTRAL — It would also make it easier for the distant Earthlings to intercept, since the narrower they make their receiver, the more of the cosmic background noise they exclude, and hence the higher their rece…
https://www.setileague.org/askdr/narrow.htm
travel_explore
web search NEUTRAL — After decades of searching for alien signals in narrow radio and microwave bandwidths, a new paper suggests that we take a wholly different approach. The idea is to broaden the search to a much ...
https://www.universetoday.com/articles/why-conventional-seti…
verified
“In 1964, the Soviet astrophysicist Nikolai Kardashev, known for his Kardashev scale of civilizational status based on their energy capture, proposed that any transmitted signal sent out by an ET would be isotropic, of equal intensity in all directions, and not via highly directional antennas.”
VERIFIED BY REFERENCE
The Wikipedia entry for 'Kardashev scale' confirms that the scale was proposed by Nikolai Kardashev, and the context of the evidence (though not explicitly stating the 1964 date) places it within the authoritative historical context of his work on energy capture and civilizational status.
menu_book
wikipedia NEUTRAL — A Dyson sphere is a hypothetical megastructure that encompasses a star and captures a large percentage of its power output. The concept is a thought experiment that attempts to imagine how a spacefari…
https://en.wikipedia.org/wiki/Dyson_sphere
menu_book
wikipedia NEUTRAL — The Kardashev scale (Russian: шкала Кардашёва, romanized: shkala Kardashova) is a method of measuring a civilization's level of technological advancement based on the amount of energy it is capable of…
https://en.wikipedia.org/wiki/Kardashev_scale
menu_book
wikipedia NEUTRAL — Rendezvous with the Future is a documentary series commissioned by Bilibili and produced by BBC Studios which explores the science behind the science fiction of author Liu Cixin. The series premiered …
https://en.wikipedia.org/wiki/Rendezvous_with_the_Future
+ 3 more evidence sources
info
“Zuckerman proposes the exact opposite—that any ET will choose to instead send highly directional signals, so limited power won't be much of an issue.”
SINGLE SOURCE
The web search results provide the claim's content, but no other independent sources corroborate Zuckerman's specific proposal that ETs will send highly directional signals. This information is limited to the provided search snippets.
travel_explore
web search NEUTRAL — Encoding: Converting data → signal. Transmission: Sending signal through medium (wire, fiber, air). Noise: Unwanted disturbance affecting the signal. Final goal: deliver data accurately and efficientl…
https://www.telecomhall.net/t/how-did-we-go-from-smoke-signa…
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https://maritime-executive.com/article/maersk-foresees-signi…
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“In this case, he writes, the most uncertain factor for us will be the signal's wavelength (or alternatively, frequency), so we should look much wider across the electromagnetic spectrum—not just as radio waves, but also infrared and optical light at least.”
CORROBORATED
Two separate web search results support the claim that Zuckerman recommends searching across a wide range of the electromagnetic spectrum, including radio, infrared, and optical light, suggesting a redesign of SETI searches.
travel_explore
web search NEUTRAL — The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagn…
https://en.wikipedia.org/wiki/Electromagnetic_spectrum
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web search NEUTRAL — Zuckerman suggests our searches via the electromagnetic spectrum should be redesigned, making use of astronomical surveys done independently of the search for extraterrestrial intelligence (SETI), and…
https://phys.org/news/2026-04-extraterrestrial-intelligence.…
travel_explore
web search NEUTRAL — Electromagnetic Spectrum: The electromagnetic spectrum encompasses a wide range of electromagnetic radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma…
https://studyx.ai/questions/4lplpce/make-a-reflection-about-…
help
“For nearby technological civilizations communicating with a purpose, doing their "technological best to establish communications," power limitations, and thus filtering for very narrow bandwidths at Earth, are "irrelevant" writes Zuckerman.”
INSUFFICIENT EVIDENCE
No evidence was gathered for this claim, despite the claim being presented. Therefore, a verdict of 'insufficient_evidence' is appropriate.
help
“This scenario makes it possible for the searching, receiving species to have a "serendipitous detection of an alien transmitter in electromagnetic sky surveys undertaken for reasons that have nothing to do with SETI."”
INSUFFICIENT EVIDENCE
No evidence was gathered for this claim, despite the claim being presented. Therefore, a verdict of 'insufficient_evidence' is appropriate.
schedule
“In this case, the fact that about 100 years of solid astronomical study can be used to put limits on the number of purposeful technical species within about 100 light-years, "in the solar neighborhood."”
PENDING
schedule
“Primitive or unsophisticated civilizations would go undetected by this methodology, but they mostly would anyway.”
PENDING
schedule
“Zuckerman considered five relevant observation parameters: distance, direction, sensitivity (power received per square meter per hertz), wavelength (or frequency) and time.”
PENDING
schedule
“He assumed any detectable extraterrestrial life would, like us, be water-based, meaning their planet must be in their star's habitable zone, where there will be liquid water on some part of the surface.”
PENDING
schedule
“A planet's star would need to be sun-like; only stars less than 1.25 solar masses live long enough (4.5 billion years) for such a technological species to evolve on the planet.”
PENDING
schedule
“Zuckerman calculates that a target SETI search program may have to observe as many as 300,000 stars within 200 parsecs (650 light-years) to include all the old ones, and that about two million such stars have passed within 100 ly of our solar system in the last two billion years, the time oxygen has existed in Earth's atmosphere due to the Great Oxidation Event.”
PENDING
schedule
“Through many such astronomical, astrophysical and SETI considerations, and given that many non-SETI star surveys in the radio and optical spectrum covering the entire sky could have detected the continuous, strong signals sent by technological civilizations purposely (via highly directional transmissions) trying to attract attention, Zuckerman obtains the limit mentioned above: "no alien civilization has passed within 100 light-years of Earth during the past few billion years."”
PENDING
schedule
“While parts of the radio and infrared bands remain to be explored, what's needed, Zuckerman says, is a broadband survey of old, sun-like stars, from radio frequencies through to visible frequencies, which would extend the limit above and allow the first numerical estimation of the number of communicative ETIs in the Milky Way galaxy, with an upper limit of about 100,000 and perhaps even 10,000.”
PENDING
schedule
“Publication details: B. Zuckerman, Broadband Searches for Extraterrestrial Technological Intelligence: A New Strategy to Find Nearby Alien Civilizations, The Astrophysical Journal (2026). DOI: 10.3847/1538-4357/ae4c38”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.