Technology signatures

The Allen Telescope Array at the Hat Creek Radio Observatory. Credit: Seth Shostak/SETI Institute

SETI scanned 3I/ATLAS for artificial signals – and found none

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Although all observations of 3I/ATLAS point to a natural comet, SETI researchers took advantage of its rare visit to search for technological signatures. The search did not turn up an artificial signal, but it showed that it is possible to quickly check
Oumuamua, the first interstellar object discovered in the solar system, has sparked renewed interest in how to distinguish between natural objects and possible technological signatures. The new study highlights that most of the solar system has not yet been scanned at sufficient resolution to definitively rule out small artificial objects. Credit: NASA, ESA, and J. Olmsted and F. Summers / STScI.

Are alien spacecraft hiding in the solar system? New study claims: We've barely looked

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A new study does not claim to have found alien spacecraft, but rather highlights another problem: Most of the solar system has not yet been scanned with sufficient resolution to rule out small artificial objects or technological remnants.
Searching for extraterrestrial intelligence using radio telescopes. Illustration: depositphotos.com

What happens if a signal from extraterrestrial intelligence is detected? Scientists now have updated rules

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The International Academy of Astronautics has updated SETI protocols: scientific verification before announcement, transparent publication of data, protection of researchers — and a ban on responding to a signal without international consultation.
An artist's impression of the exoplanet K2-18b, a world larger than Earth orbiting a red dwarf and being studied in search of possible signs of life or technological signatures.

K2-18b Scanned for Alien Signals – But No Technological Signature Found

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SETI researchers used the VLA and MeerKAT telescope to search for narrow radio signals from the intriguing exoplanet. None survived the noise filters, but the method will be used in future searches
A Dyson sphere is a hypothetical megastructure built by an advanced civilization to capture the vast amounts of energy emitted by a star. Illustration: depositphotos.com

Are the coldest "stars" in the galaxy alien megastructures?

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Astronomers propose a new way to identify alien megastructures: look for extremely cold "stars" that emit mostly infrared light and appear free of dust.
Radio telescopes searching for intelligent signals in space. Illustration: depositphotos.com

Study examines possibility that extraterrestrial technological signals passed near Earth without being detected

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Even if signals from technological civilizations reached our region, they may not have been detected due to limitations in range, duration, and intensity. The researchers conclude that the chance of detection will increase mainly with prolonged searches over greater distances.
The Allen Telescope Array. Credit: SETI Institute

Pulsar's twinkle reveals the hidden fabric of space

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SETI Institute observations of the Allen Telescope Array over about 10 months have shown how the twinkling of pulsars varies over time, creating tiny delays that require correction in precise timing measurements. The subtle twinkling of a pulsar reveals
MWA detectors in Western Australia will assist in the search for signs of extraterrestrial technology. Photo: STI Institute

A first-of-its-kind study will scan 2,800 galaxies for extraterrestrial technology

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The SETI Institute, the SETI Research Center in Berkeley, and the International Center for Radio Astronomy Research in Western Australia. The research is the first attempt to search for extraterrestrial technology in galaxies outside our galaxy, focusing on low frequencies
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