Technosignatures: A Multi-Mission, Multi-Wavelength Search for Signs of Extraterrestrial Technology

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Technosignatures are signs of past or present technology from extraterrestrials, searched for through indicators like Dyson spheres and other megastructures, artificial heat or lights, atmospheric pollutants, interstellar probes, or artifacts, with debate over including radio transmissions, a field championed by Jill Tarter as an umbrella for intelligent-signature searches and pursued with multi‑wavelength, multi‑mission campaigns that have yielded intriguing but unconfirmed candidates and stress careful verification and ethical considerations.

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Technosignature - Wikipedia

Technosignature denotes any measurable signal of past or present technology, a concept promoted by Jill Tarter as an umbrella for the search for intelligent signatures, spanning astroengineering footprints such as Dyson spheres and megastructures inferred from transit or spectral data, theoretical propulsion constructs like Shkadov thrusters, planetary indicators such as artificial heat and lights on nightsides and atmospheric anomalies (NO2, CFCs) or exoplanetary albedo patterns, as well as extraterrestrial artifacts like interstellar probes, self-replicating machines, and the Clarke Exobelt of dense artificial satellites, with ongoing searches from Fermilab infrared surveys and Kepler-era Dyson-sphere hunts, NASA-supported projects, and the VASCO citizen-science effort, all emphasizing verification against interference, ethical considerations, and multi-wavelength, multi-mission approaches to broaden detection chances.