Signal Under Analysis helps curious readers understand research on extraterrestrial life, UAP cases, and alien culture by separating evidence, hypothesis, and fiction.
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The Drake Equation organizes seven factors involving stars, planets, life, intelligence, detectable technology and duration. It is useful for testing assumptions, but it does not p...
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The study turns a hypothesis about technological particles in lunar regolith into a quantitative test, but reports no evidence of extraterrestrial technology.
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The Allen Telescope Array found no technosignatures. Here is what 7.25 hours at 1–9 GHz, the 10–110 W limit, and human interference really allow us to conclude.
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Official records confirm reports and an investigation on Trindade Island, but leave decisive gaps in the chain of custody and authenticity of the 1958 photos.
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Astrobiology, exoplanets, biosignatures and potentially habitable environments.
UAPs & Evidence9 articlesDocuments, videos, reports and investigations analyzed with context and caution.
SETI & Technosignatures8 articlesMethods used to search for signs of intelligence and technology beyond Earth.
Alien History and Culture2 articlesHistorical cases, cinema, literature, folklore and cultural influence of extraterrestrials.
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Military documents confirm the investigation of lights and reports in Pará in 1977. This audit separates observation, testimony and the extraterrestrial hypothesis.
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The absence of technosignals does not prove that we are alone. Understand what radio, atmospheres, megastructures, artifacts and biosignatures can actually test.
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The IPM in the Varginha case investigated allegations of military participation, interviewed witnesses and checked records. The records support some conclusions with unequal streng...
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The 2026 version of the IAA details how to verify a candidate, announce a detection, preserve data, and why no response should come before international consultation.
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The 1947 files record wreckage, a "flying saucer" statement, and a quick correction. Decades later, Mogul and body reports were investigated separately.
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Dyson spheres are a real technosignal hypothesis. Understand how Gaia, 2MASS, WISE and JWST look for infrared excess and rule out contamination.
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How SETI separates a promising signal from terrestrial interference using Doppler drift, ON/OFF observations, RFI analysis, replay and follow-up.
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AARO's FY2025 brings together 319 reports, but 191 were archived due to lack of data. The report also shows progress in identifying satellite flares.
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The 1938 broadcast frightened listeners and jammed telephones in some locations, but the best evidence does not support mass national hysteria.
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Astrobiology, exoplanets, biosignatures and potentially habitable environments.
JWST found spectral signals compatible with DMS/DMDS on K2-18 b, but reanalysis shows the identification is not robust — and this does not prove life.
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NASA has opened a call to reduce HWO scientific uncertainties, from habitable worlds and stellar targets to dust, atmospheres and biosignatures.
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Study in Science detected helium escaping from LHS 1140 b. The finding indicates an atmosphere on a rocky world in the habitable zone, but is not a sign of life.
Read articleDocuments, videos, reports and investigations analyzed with context and caution.
PURSUE Release 05 expands the public collection of UAP files, but “unresolved” indicates a lack of conclusion — often due to insufficient data, not extraordinary evidence.
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Air Force documents confirm visual contacts, radar echoes and five takeoffs on May 19, 1986, but do not identify the origin of the targets.
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Before zooming in on a light in the sky, preserve the original video. Motion, duration, trajectory and metadata help separate meteor, satellite, flare and artifact.
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An audit of the official pages shows that “05/08/2026” means May 8th, not August 5th. The files are real, but they do not support extraordinary conclusions.
Read articleMethods used to search for signs of intelligence and technology beyond Earth.
On August 15, 1977, the Big Ear recorded a narrow signal for 72 seconds. The 6EQUJ5 sequence measures intensity, not an alien message.
Read articleThe Drake Equation organizes seven factors involving stars, planets, life, intelligence, detectable technology and duration. It is useful for testing assumptions, but it does not p...
Read articleThe study turns a hypothesis about technological particles in lunar regolith into a quantitative test, but reports no evidence of extraterrestrial technology.
Read articleThe Allen Telescope Array found no technosignatures. Here is what 7.25 hours at 1–9 GHz, the 10–110 W limit, and human interference really allow us to conclude.
Read articleHistorical cases, cinema, literature, folklore and cultural influence of extraterrestrials.
The 1947 files record wreckage, a "flying saucer" statement, and a quick correction. Decades later, Mogul and body reports were investigated separately.
Read articleThe 1938 broadcast frightened listeners and jammed telephones in some locations, but the best evidence does not support mass national hysteria.
Read articleSignal Under Analysis investigates questions about extraterrestrial life, astrobiology, SETI, and anomalous phenomena. We publish explainers, document analyses, historical context, and cultural content. Each piece distinguishes confirmed facts, preliminary findings, claims, interpretations, and fiction. We do not claim extraterrestrial origin without verifiable evidence, and we update articles when relevant sources or conclusions change.
