A range of speculative space ventures envisage the use of ultra-large structures for the collection and reflection of light.
SETI
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Habitable Zones, Imaging & Spectroscopy, Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report
Rotational Doppler Cartography Of Technosignatures On Unresolved Planets
The discovery of many Earth-like planets has renewed interest in whether life and technological civilizations exist elsewhere.
Posted inBiosignatures & Paleobiology, Intelligence & Language, SETI & Technosignatures, Status Report
Constraining the Lifespan of Intelligent Technological Civilization in the Galaxy
In this work, we explore constraints on the emergence and longevity of technologically intelligent civilizations in our Galaxy, considering the Fermi paradox.
Posted inBiosignatures & Paleobiology, Gaia - Planetary Perspectives, Intelligence & Language, SETI & Technosignatures, Status Report
How Common Are Oxygenic Photosynthesis And Large Coal Deposits On Exoplanets?
In the search for extraterrestrial intelligence (SETI), it is often assumed that intelligent life on an Earth-like exoplanet would inevitably develop the technological means for interstellar communication. This assumption ignores […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report
Undetected Past Contacts With Technological Species: Implications For Technosignature Science
In the search for extraterrestrial intelligence (SETI), the highly incomplete sampling of the technosignature search space is often considered as a plausible explanation for the persistent lack of detections over […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Intelligence & Language, Interstellar, Press Release, SETI & Technosignatures, Societal Issues
If Alien Signals Reached Earth, Why Haven’t We Seen Them?
Since the first SETI experiment in 1960, astronomers have scanned the Milky Way for signs of advanced extraterrestrial civilizations. These searches have covered radio waves, optical flashes, and infrared heat […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Intelligence & Language, SETI & Technosignatures, Status Report, Water/Hycean Worlds & Oceanography
A Narrowband Technosignature Search Toward The Hycean Candidate K2-18b Using The VLA And MeerKAT
K2-18b, a sub-Neptune exoplanet located in the habitable zone of its host star, has emerged as an important target for atmospheric characterization and assessments of potential habitability.
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Imaging & Spectroscopy, Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report
WISE/CatWISE Constraints On Dysonian Waste-Heat Technosignatures In Nearby Galaxies
We search for galaxy-scale (Dysonian) waste heat in the mid-infrared using WISE. Starting from the 2MASS Redshift Survey (2MRS), we cross-match to CatWISE2020 and AllWISE, apply standard MIR AGN/starburst vetoes […]
Posted inAstrobiology (general), Astronomy & Telescopes, Biosignatures & Paleobiology, People Of Astrobiology, Press Release, SETI & Technosignatures
SETI Institute Opens Call For Nominations For The 2026 Tarter Award
The SETI Institute announced that nominations are now open for the 2026 Tarter Award for Innovation in the Search for Life Beyond Earth. The Tarter Award recognizes individuals whose projects […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Citizen Science / Open Science, Intelligence & Language, People Of Astrobiology, Press Release, SETI & Technosignatures
SETI@Home Enthusiasts Used Home Computers To Search For ET. Scientists Focus On 100 signals They Found
For 21 years, between 1999 and 2020, millions of people worldwide loaned UC Berkeley scientists their computers to search for signs of advanced civilizations in our galaxy.