Results 51 to 60 of about 588 (145)
Dependence of Biological Activity on the Surface Water Fraction of Planets
, 2019 One of the unique features associated with the Earth is that the fraction of its surface covered by land is comparable to that spanned by its oceans and other water bodies.
Lingam, Manasvi, Loeb, Abraham
core +1 more source
Real-time Technosignature Strategies with SN 2023ixf
Research Notes of the AAS, 2023 Abstract Several technosignature techniques focus on historic events such as SN 1987A as the basis to search for coordinated signal broadcasts from extraterrestrial agents. The recently discovered SN 2023ixf in the spiral galaxy M101 is the nearest Type II supernova in over a decade, and will serve as an important benchmark event.
James R. A. Davenport +7 more
openaire +2 more sources
Astro2020 Project White Paper: The Cosmic Accelerometer [PDF]
, 2019 We propose an experiment, the Cosmic Accelerometer, designed to yield velocity precision of $\leq 1$ cm/s with measurement stability over years to decades.
Bentz, Misty +17 more
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, 2020 We conducted a search for technosignatures in April of 2018 and 2019 with the L-band receiver (1.15-1.73 GHz) of the 100 m diameter Green Bank Telescope. These observations focused on regions surrounding 31 Sun-like stars near the plane of the Galaxy. We
Alexander, Stephen +39 more
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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
doaj +1 more source
A Search for Extraterrestrial Technosignatures in Archival FAST Survey Data Using a New Procedure
The Astronomical Journal, 2023 The search for extraterrestrial intelligence (SETI) commensal surveys aim to scan the sky to find possible technosignatures from an extraterrestrial intelligence (ETI). The mitigation of radio frequency interference (RFI) is an important step, especially
Yu-Chen Wang +6 more
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Multiverse Predictions for Habitability: Fraction of Life that Develops Intelligence
, 2019 Do mass extinctions affect the development of intelligence? If so, we may expect to be in a universe that is exceptionally placid. We consider the effects of impacts, supervolcanoes, global glaciations, and nearby gamma ray bursts, and how their rates ...
Sandora, McCullen
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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,
openaire +3 more sources
The Astronomical JournalThe search for extraterrestrial intelligence at radio frequencies has focused on spatial filtering as a primary discriminant from terrestrial interference.
Bryan Brzycki +9 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
openaire +2 more sources