Results 61 to 70 of about 434 (179)

Multibeam SETI Observations Toward Nearby M Dwarfs with FAST

The Astronomical Journal
The search for extraterrestrial intelligence (SETI) targeted searches aim to observe specific areas and objects to find possible technosignatures. Many SETI researches have focused on nearby stars and their planets in recent years.
Xiao-Hang Luan, Bo-Lun Huang, Zhen-Zhao Tao, Yan Cui, Tong-Jie Zhang, Pei Wang   +5 more
doaj   +1 more source

The FAST-SETI Milky Way Globular Cluster Survey. I. A Pilot Multibeam On-the-fly Search of Five Globular Clusters at the L Band

The Astronomical Journal
We report a narrowband technosignature search toward five Milky Way globular clusters—NGC 6171, NGC 6218, NGC 6254, NGC 6838, and IC 1276—using Five-hundred-meter Aperture Spherical radio Telescope (FAST)’s 19 beam L -band receiver (1.05–1.45 GHz).
Bo-Lun Huang, Zhen-Zhao Tao, Tong-Jie Zhang, Vishal Gajjar   +3 more
doaj   +1 more source

WISE/CatWISE Constraints on Dysonian Waste-heat Technosignatures in Nearby Galaxies

The Astronomical Journal
We search for galaxy-scale (Dysonian) waste heat in the mid-infrared using WISE. Starting from the 2MASS Redshift Survey, we crossmatch to CatWISE2020 and AllWISE, apply standard MIR AGN/starburst vetoes (Stern, Assef R90, Jarrett), and treat W1 and W2 ...
Bo-Lun Huang, Zhen-Zhao Tao, Tong-Jie Zhang   +2 more
doaj   +1 more source

Microlensing Signatures of Dyson Sphere–like Structures around Primordial Black Holes as Technosignatures of Extraterrestrial Advanced Civilizations

The Astrophysical Journal
We investigate the microlensing detectability of extraterrestrial technosignatures originating from Dyson sphere-like structures, such as Dyson swarms surrounding primordial black holes.
Shant Baghram
doaj   +1 more source

A Narrowband Technosignature Search toward the Hycean Candidate K2-18 b Using the VLA and MeerKAT

The Astronomical Journal
K2-18 b, 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.
C. D. Tremblay, S. Chaudhary, M. G. Li, S. Z. Sheikh, T. Myburgh, D. Czech, D. E. MacMahon, P. B. Demorest, R. A. Donnachie, A. P. V. Siemion, V. Gajjar, M. Lebofsky, K. Wandia, K. I. Perez, N. Madhusudhan   +14 more
doaj   +1 more source

Dual-backend Multibeam Position-switching Targeted SETI Observations toward Nearby Active Planet-hosting Systems with FAST

The Astronomical Journal
The Five-hundred-meter Aperture Spherical Telescope (FAST), the world’s largest single-dish radio telescope, lists the search for extraterrestrial intelligence (SETI) as one of its key scientific objectives.
Jian-Kang Li, Zhen-Zhao Tao, Pei Wang, Tong-Jie Zhang   +3 more
doaj   +1 more source

CARGOISM AND SCIENTIFIC JUSTIFICATION IN THE SEARCH FOR EXTRATERRESTRIAL INTELLIGENCE

Zygon, 2019
This article compares justifications of the search for extraterrestrial intelligence (SETI) presented by scientists with ideational constructs associated with cargo cults in Melanesia. In focusing on similarities between cargoism and SETI, I argue that,
doaj   +2 more sources

In Search of Extraterrestrial Artificial Intelligence Through Dyson Sphere–like Structures around Primordial Black Holes

The Astrophysical Journal
Are we alone? It is a compelling question that human beings have confronted for centuries. The search for extraterrestrial life is a broad range of quests for finding simple forms of life up to intelligent beings in the Universe. The plausible assumption
Shant Baghram
doaj   +1 more source

Detecting Extraterrestrial Civilizations that Employ an Earth-level Deep Space Network

The Astrophysical Journal Letters
A major aspect of the search for extraterrestrial intelligence (SETI) involves searching for electromagnetic transmissions from extraterrestrial sources, often using our own transmissions as a guide.
Pinchen Fan, Jason T. Wright, T. Joseph W. Lazio   +2 more
doaj   +1 more source

Life in a Random Universe: Sciama's Argument Reconsidered

The Astrophysical Journal
Random sampling in high dimensions has successfully been applied to phenomena as diverse as nuclear resonances, neural networks, and black hole evaporation. Here we revisit an elegant argument by the British physicist Dennis Sciama, who demonstrated that
Zhi-Wei Wang, Samuel L. Braunstein
doaj   +1 more source