Results 51 to 60 of about 283 (144)
Undetected Past Contacts with Technological Species: Implications for Technosignature Science
The Astronomical JournalIn 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 six decades of searches. If correct, this
Claudio Grimaldi
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The Astrophysical Journal, 2023 I apply the thermodynamics of radiation to Dyson spheres as machines that do work or computation and examine their observational consequences. I identify four properties of Dyson spheres that complicate typical analyses: globally, they may do no work in ...
Jason T. Wright
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Specular Reflections from Artificial Surfaces as Technosignature
Astrobiology, 2023 Direct imaging of exoplanets will allow for observation of a planet in reflected light. Such a scenario may eventually allow for the possibility to scan a planetary surface for the presence of artificial structures made by alien civilizations. Detectability of planetary-scale structures, called megastructures, has been previously explored. In this work,
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A Search for Technosignatures Around 11,680 Stars with the Green Bank Telescope at 1.15–1.73 GHz
The Astronomical Journal, 2023 We conducted a search for narrowband radio signals over four observing sessions in 2020–2023 with the L -band receiver (1.15–1.73 GHz) of the 100 m diameter Green Bank Telescope.
Jean-Luc Margot +79 more
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Observational Constraints on the Great Filter
, 2020 The search for spectroscopic biosignatures with the next generation of space telescopes could provide observational constraints on the abundance of exoplanets with signs of life.
Ravi Kumar Kopparapu +5 more
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Technosignatures in the Thermal Infrared
, 2019 WISE, Gaia, and JWST provide an opportunity to compute the first robust upper limits on the energy supplies of extraterrestrial civilizations, both for stars in the Galaxy (Kardashev Type II civilizations) and for other galaxies (Kardashev Type III civilizations). Together, they allow for a nearly-complete catalog of nearby stars with infrared excesses,
Wright, Jason T. +2 more
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The radio search for technosignatures in the decade 2020-2030 [PDF]
, 2019 Advancing the scientific frontier in the search for life in the universe requires support of searches for both biosignatures and technosignatures. A modest budgetary increment can expand the search for life in the universe from primitive to complex life ...
Korpela, Eric J +4 more
core
, 2018 The Exo-Life Finder (ELF) will be an optical system with the resolving power of a ≥20m telescope optimized for characterizing exoplanets and detecting exolife.
Tarter, J. +25 more
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Searching for lasers in M dwarf spectra using the Habitable-zone Planet Finder
, 2021 Precision radial velocity (RV) surveys use high resolution spectrographs in the optical and near-infrared to search for exoplanets. In this presentation we describe our pipeline and preliminary results to search for unresolved laser technosignatures in M
Shubham Kanodia
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A Search for Radio Technosignatures from Interstellar Object 3I/ATLAS with the Allen Telescope Array
The Astronomical JournalIn 2025 July, the third-ever interstellar object, 3I/ATLAS, was discovered on its ingress into the solar system. Similar to the NASA Voyager missions sent in 1977, science probes by extraterrestrial life (“artifact technosignatures”) could be sent to ...
Sofia Z. Sheikh +14 more
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