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Many articulations of the Fermi Paradox have as a premise, implicitly or explicitly, that humanity has searched for signs of extraterrestrial radio transmissions and concluded that there are few or no obvious ones to be found. Tarter et al.…

天体物理仪器与方法 · 物理学 2020-07-21 Jason T. Wright , Shubham Kanodia , Emily G. Lubar

A formula is proposed to quantitatively estimate the signal emission rate of Communicating Extra-Terrestrial Intelligent civilizations (CETIs) in the Galaxy. I suggest that one possible type of CETI signal would be brief radio bursts…

科普物理 · 物理学 2020-11-10 Bing Zhang

A new solution to the Fermi Paradox is presented: probes or visits from putative alien civilizations have a very low probability until a civilization reaches a certain age (called the Contact Era) after the onset of radio communications. If…

科普物理 · 物理学 2022-12-27 Amri Wandel

SETI@home is a radio Search for Extraterrestrial Intelligence (SETI) project that looks for technosignatures in data recorded at the Arecibo Observatory. The data were collected over a period of 14 years and cover almost the entire sky…

天体物理仪器与方法 · 物理学 2025-07-25 David P. Anderson , Eric J. Korpela , Dan Werthimer , Jeff Cobb , Bruce Allen

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.…

天体物理仪器与方法 · 物理学 2025-05-08 Snir Pardo , Dovi Poznanski , Steve Croft , Andrew P. V. Siemion , Matthew Lebofsky

The existence of intelligent extraterrestrial life forms among the thousands of billions of galaxies that dance in the Universe is beyond doubt. Meeting with one of them is only a matter of time. SETI (Search for Extraterrestrial…

科普物理 · 物理学 2017-08-22 Olivier Auber

In the winter of 1967 Cambridge radio astronomers discovered a new type of radio source of such an artificial seeming nature that for a few weeks some members of the group had to seriously consider whether they had discovered an…

物理学史与哲学 · 物理学 2013-02-05 Alan Penny

We consider interstellar scintillations as a cause of intermittency in radio signals from extraterrestrial intelligence (ETI). We demonstrate that scintillations are very likely to allow initial detections of narrowband signals from distant…

天体物理学 · 物理学 2009-10-30 James M. Cordes , T. Joseph W. Lazio , Carl Sagan

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.…

科普物理 · 物理学 2023-07-31 John Gertz

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…

天体物理仪器与方法 · 物理学 2021-07-27 Michael Hippke

Searches for radio technosignatures place constraints on the prevalence of extraterrestrial transmitters in our Galaxy and beyond. It is important to account for the complete stellar population captured within a radio telescope's field of…

天体物理仪器与方法 · 物理学 2025-11-26 Louisa A. Mason , Michael A. Garrett , Andrew P. V. Siemion

Within the SETI community, a school of thought holds that ET might prefer to send information physically in so-called "probes," rather than by radio or optical beacon, in effect, a message in a bottle. In this paper, a related solution to…

科普物理 · 物理学 2021-06-09 John Gertz

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…

信号处理 · 电气工程与系统科学 2018-09-19 Gregory Hellbourg

Since it began \cite{CocconiMorrison}, the search for extraterrestrial intelligence (SETI) has focused on interstellar \emph{classical} communication. Recently, Berera \cite{Berera:2020rpl} pointed out that, at certain frequencies, photon…

量子物理 · 物理学 2024-08-06 Latham Boyle

The Search for Extraterrestrial Intelligence (SETI) makes certain assumptions which guide all current search programs. To illustrate some, this includes (1) that interstellar flight is not possible (2) that the motivations of interstellar…

科普物理 · 物理学 2019-01-31 Kelvin F Long

The Search for Extraterrestrial Intelligence aims to find evidence of technosignatures, which can point toward the possible existence of technologically advanced extraterrestrial life. Radio signals similar to those engineered on Earth may…

The Search for Extraterrestrial Intelligence (SETI) has heretofore been a largely passive exercise, reliant on the pursuit of technosignatures. Still, there are those that advocate a more active approach. Messaging Extraterrestrial…

科普物理 · 物理学 2020-08-11 T. Cortellesi

The Square Kilometre Array is conceived as a telescope which will both test fundamental physical laws and transform our current picture of the Universe. However, the scientific challenges outlined in this book are today's problems--will…

天体物理学 · 物理学 2009-11-10 P. N. Wilkinson , K. I. Kellermann , R. D. Ekers , J. M. Cordes , T. Joseph W. Lazio

The cosmological case for a next generation radio observatory, the Square Kilometer Array, is discussed and reviewed. An instrument like the SKA would be able to measure galaxy redshifts of normal late-type galaxies, via the 21 cm line of…

天体物理学 · 物理学 2007-05-23 Rien van de Weygaert , Tjeerd S. van Albada

The discovery of many Earth-like planets has renewed interest in whether life and technological civilizations exist elsewhere. The Search for Extraterrestrial Intelligence (SETI) seeks evidence for technological civilizations via…

地球与行星天体物理 · 物理学 2026-03-03 Keitaro Takahashi