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The radio Search for Extra Terrestrial Intelligence (SETI) aims at identifying intelligent and communicative civilizations in the Universe through the detection of engineered transmissions. In the absence of prior knowledge concerning the…

Signal Processing · Electrical Eng. & Systems 2018-09-12 Gregory Hellbourg , Andrew Xu

The Search for Extraterrestrial intelligence (SETI) is a scientific and cultural effort seeking evidence of intelligent life beyond earth. Radio SETI observes the radio spectrum for ''technosignatures" that could be produced by an advanced…

Instrumentation and Methods for Astrophysics · Physics 2021-09-29 Kenneth M. Houston , Andrew P. V. Siemion , Steve Croft

The Search for Extra-terrestrial Intelligence (SETI) aims to find technological signals of extra-solar origin. Radio frequency SETI is characterized by large unlabeled datasets and complex interference environment. The infinite…

Instrumentation and Methods for Astrophysics · Physics 2019-01-16 Yunfan Gerry Zhang , Ki Hyun Won , Seung Woo Son , Andrew Siemion , Steve Croft

The search for extraterrestrial intelligence (SETI) is a scientific endeavor which struggles with unique issues -- a strong indeterminacy in what data to look for and when to do so. This has led to attempts at finding both fundamental…

Information Theory · Computer Science 2021-07-22 Ian George , Xinan Chen , Lav R. Varshney

Arguments are reviewed in support of the hypothesis that ET would more likely send physical probes to surveil our Solar System and communicate with Earth than to communicate from afar with interstellar radio, infrared or laser beacons.…

Popular Physics · Physics 2023-07-31 John Gertz

The discovery of ubiquitous habitable extrasolar planets, combined with revolutionary advances in instrumentation and observational capabilities, has ushered in a renaissance in the search for extra-terrestrial intelligence (SETI). Large…

One of the most interesting questions that astronomy can hope to answer is: are we alone in our Milky Way galaxy? A detection of an electromagnetic (EM) signal generated by an extraterrestrial technological intelligence, or the presence in…

Instrumentation and Methods for Astrophysics · Physics 2026-05-01 B. Zuckerman

As a guide for astronomers new to the field of technosignature search (i.e. SETI), I present an overview of some of its observational and theoretical approaches. I review some of the various observational search strategies for SETI,…

Instrumentation and Methods for Astrophysics · Physics 2021-07-28 Jason T. Wright

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. Previous studies have suggested that…

Instrumentation and Methods for Astrophysics · Physics 2025-08-22 Pinchen Fan , Jason T. Wright , T. Joseph W. Lazio

For more than 60 years, the predominant SETI search paradigm has entailed the observation of stars in an effort to detect alien electromagnetic signals that deliberately target Earth. However, this strategy is fraught with challenges when…

Popular Physics · Physics 2023-08-02 John Gertz

The Search for Extra-terrestrial Intelligence (SETI) using radio telescopes is an area of research that is now more than 50 years old. Thus far, both targeted and wide-area surveys have yet to detect artificial signals from intelligent…

Instrumentation and Methods for Astrophysics · Physics 2015-05-20 Michael A. Garrett

The transmission rate of communication between radio telescopes on Earth and extraterrestrial intelligence (ETI) is here calculated up to distances of 1000 light years. Both phase-shift-keying (PSK) and frequency-shift keying (FSK)…

Instrumentation and Methods for Astrophysics · Physics 2011-09-01 P. A. Fridman

The search for extraterrestrial intelligence by looking for signals from advanced technological civilizations has been ongoing for some decades. We suggest that it could possibly be made more efficient by focusing on stars from which the…

Earth and Planetary Astrophysics · Physics 2009-03-10 Shmuel Nussinov

We applied the Koch snowflake fractal antenna in planning calibration of the Five-hundred-meter Aperture Spherical radio Telescope (FAST), hypothesizing second-order fractal primary reflectors can optimize the orientated sensitivity of the…

Instrumentation and Methods for Astrophysics · Physics 2021-07-15 Yi-Xuan Chen , Wen-Fei Liu , Zhi-Song Zhang , Tong-Jie Zhang

The Search for Extra-Terrestrial Intelligence (SETI) has been conducted for over sixty years, yet no technosignatures have been identified. Previous studies have focused on stars in our galaxy, with few searches in the extragalactic…

High Energy Astrophysical Phenomena · Physics 2023-04-12 Yuri Uno , Tetsuya Hashimoto , Tomotsugu Goto , Simon C. -C. Ho , Tzu-Yin Hsu , Ross Burns

Much work in SETI has focused on detecting radio broadcasts due to extraterrestrial intelligence, but there have been limited efforts to transmit messages over interstellar distances. As a check if such messages can be interpreted once…

Instrumentation and Methods for Astrophysics · Physics 2011-01-20 Michael W. Busch , Rachel M. Reddick

The main purpose of this article is to make Astronomers aware that Searches for Extraterrestrial Intelligence can be carried out by analyzing standard astronomical spectra, including those they already have taken. Simplicity is the…

Instrumentation and Methods for Astrophysics · Physics 2015-06-11 Ermanno F. Borra

The Breakthrough Listen Initiative has embarked on a comprehensive SETI survey of nearby stars in the Milky Way that is vastly superior to previous efforts as measured by a wide range of different metrics. SETI surveys traditionally ignore…

High Energy Astrophysical Phenomena · Physics 2022-09-20 M. A. Garrett , A. P. V. Siemion

The lack of evidence for the existence of extraterrestrial life, even the simplest forms of animal life, makes it is difficult to decide whether the search for extraterrestrial intelligence (SETI) is more a high-risk, high-payoff endeavor…

Popular Physics · Physics 2017-04-14 Claudio Grimaldi

Almost all SETI searches to date have explicitly targeted stars in the hope of detecting artificial radio or optical transmissions. It is argued that extra-terrestrials (ET) might regard sending physical probes to our own Solar System as a…

Popular Physics · Physics 2021-06-09 John Gertz
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