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The modern search for extraterrestrial intelligence (SETI) began with the seminal publications of Cocconi & Morrison (1959) and Schwartz & Townes (1961), who proposed to search for narrow-band signals in the radio spectrum, and for optical…

Instrumentation and Methods for Astrophysics · Physics 2021-07-27 Michael Hippke

The Optical Search for Extraterrestrial Intelligence (OSETI) attempts to detect collimated, narrowband pulses of electromagnetic radiation. These pulses may either consist of signals intentionally directed at the Earth, or signals between…

Popular Physics · Physics 2014-10-30 Duncan H. Forgan

As a major approach to looking for life beyond the Earth, the search for extraterrestrial intelligence (SETI) is committed to detecting technosignatures such as engineered radio signals that are indicative of technologically capable life.…

We are designing and constructing a new SETI (Search for Extraterrestrial Intelligence) instrument to search for direct evidence of interstellar communications via pulsed laser signals at near-infrared wavelengths. The new instrument design…

The Drake Equation has proven fertile ground for speculation about the abundance, or lack thereof, of communicating extraterrestrial intelligences (CETIs) for decades. It has been augmented by subsequent authors to include random variables…

General Physics · Physics 2023-01-10 Reginald D. Smith

Radio Searches for Extra Terrestrial Intelligence aim at detecting artificial transmissions from extra terrestrial communicative civilizations. The lack of prior knowledge concerning these potential transmissions increase the search…

Signal Processing · Electrical Eng. & Systems 2018-09-19 Gregory Hellbourg

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

With the advent of modern astronomy, humans might now have acquired the technological and intellectual requirements to communicate with other intelligent beings beyond the solar system, if they exist. Radio signals have been identified as a…

Popular Physics · Physics 2018-08-22 René Heller

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 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

The search for extraterrestrial intelligence (SETI) has been heavily influenced by solutions to the Drake Equation, which returns an integer value for the number of communicating civilisations resident in the Milky Way, and by the Fermi…

Astrophysics · Physics 2015-05-13 Duncan Forgan

The search for extraterrestrial intelligence (SETI) is to search for technosignatures associated with extraterrestrial life, such as engineered radio signals. In this paper, we apply the multibeam coincidence matching (MBCM) strategy, and…

Searching for signatures of cosmic-scale archaeological artifacts such as Dyson spheres or Kardashev civilizations is an interesting alternative to conventional SETI. Uncovering such an artifact does not require the intentional transmission…

Astrophysics of Galaxies · Physics 2011-04-14 Richard A. Carrigan

The possibility that extraterrestrial intelligences (ETIs) could be hostile to humanity has been raised as a reason to avoid even trying to contact ETIs. However, there is a distinct shortage of analytical discussion about the risks of an…

Popular Physics · Physics 2013-02-05 Janne M. Korhonen

We implement a machine learning algorithm to search for extra-terrestrial technosignatures in radio observations of several hundred nearby stars, obtained with the Parkes and Green Bank Telescopes by the Breakthrough Listen collaboration.…

Instrumentation and Methods for Astrophysics · Physics 2025-05-08 Snir Pardo , Dovi Poznanski , Steve Croft , Andrew P. V. Siemion , Matthew Lebofsky

The field of the Search for Extraterrestrial Intelligence (SETI) searches for ``technosignatures'' that could provide the first detection of life beyond Earth through the technology that an extraterrestrial intelligence (ETI) may have…

Instrumentation and Methods for Astrophysics · Physics 2025-02-06 Sofia Z. Sheikh , Macy J. Huston , Pinchen Fan , Jason T. Wright , Thomas Beatty , Connor Martini , Ravi Kopparapu , Adam Frank

In 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…

Instrumentation and Methods for Astrophysics · Physics 2026-02-23 Claudio Grimaldi

SETI@home, a search for signals from extraterrestrial intelligence, has been recording data at the Arecibo radio telescope since 1999. These data are sent via the Internet to the personal computers of volunteers who have donated their…

Instrumentation and Methods for Astrophysics · Physics 2011-09-09 Eric J. Korpela , Jeff Cobb , Matt Lebofsky , Andrew Siemion , Joshua von Korff , Robert C. Bankay , Dan Werthimer , David Anderson

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

For centuries, astronomers have discussed the possibility of inhabited worlds - from Herschel's 18th-century observations suggesting Mars may host life, to the systematic search for technosignatures that began in the 1960s using radio…

Instrumentation and Methods for Astrophysics · Physics 2025-10-22 Beatriz Villarroel , Wesley A. Watters , Alina Streblyanska , Enrique Solano , Stefan Geier , Lars Mattsson