SETI & Technosignatures

Methods used to search for signs of intelligence and technology beyond Earth.

8articles

Radiotelescópios sob um céu estrelado com a Via Láctea, planetas e uma galáxia, enquanto uma pessoa observa o horizonte.

SETI & Technosignatures18/09/20267 min read

Drake Equation: what the seven terms measure and why N does not predict how many aliens exist

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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Mão enluvada usa uma pinça para coletar um pequeno fragmento geométrico no regolito lunar, com bandeja de amostras, rover e a Terra ao fundo.

SETI & Technosignatures08/09/20268 min read

Microscopic technosignatures on the Moon: what the new study proposes looking for — and why it is not evidence of aliens

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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Radiotelescópios sob um céu estrelado apontam para um cometa brilhante cruzando o céu noturno.

SETI & Technosignatures01/09/20266 min read

SETI and 3I/ATLAS: what the null result actually rules out

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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Radiotelescópio apontado para a Via Láctea, com ondas de sinal, grade de dados e planetas distantes no céu noturno.

SETI & Technosignatures20/08/202612 min read

Fermi paradox: why haven't we found aliens yet and what hypotheses can be tested?

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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Sala de controle do SETI com pesquisadores diante de monitores e grande radiotelescópio sob céu estrelado, ao lado de um fluxo visual de confirmação e resposta.

SETI & Technosignatures16/08/202610 min read

If SETI detects an alien signal, what happens next? The protocol updated in 2026

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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Ilustração espacial de uma estrela cercada por uma megaestrutura semelhante a uma esfera de Dyson, com telescópio e painéis de análise infravermelha ao lado.

SETI & Technosignatures15/08/202610 min read

Is Dyson sphere a technosignal? How astronomers look for residual heat and eliminate false positives

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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Espectrograma de rádio genérico com uma linha estreita inclinada entre painéis de observação do alvo e de referência.

SETI & Technosignatures10/08/20268 min read

A radio signal looks artificial: how does SETI try to prove it didn't come from Earth?

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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Impressão de dados do radiotelescópio Big Ear com a sequência 6EQUJ5 circulada e a anotação manuscrita “Wow!”

SETI & Technosignatures05/08/202610 min read

49 years of the Wow! signal: what was detected in 72 seconds and why it's not proof of aliens

On August 15, 1977, the Big Ear recorded a narrow signal for 72 seconds. The 6EQUJ5 sequence measures intensity, not an alien message.

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