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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. In this work, we present a…

Instrumentation and Methods for Astrophysics · Physics 2026-01-19 Jian-Kang Li , Zhen-Zhao Tao , Pei Wang , Tong-Jie Zhang

The Milky Way Galaxy contains an unknown number, $N$, of civilizations that emit electromagnetic radiation (of unknown wavelengths) over a finite lifetime, $L$. Here we are assuming that the radiation is not produced indefinitely, but…

Popular Physics · Physics 2018-04-11 Claudio Grimaldi , Geoffrey W. Marcy , Nathaniel K. Tellis , Frank Drake

The rapid growth of human activities in outer space sounds urgent alarms around ethical and philosophical issues, particularly concerning space militarization. The present international legal framework governing activities in space, the…

Instrumentation and Methods for Astrophysics · Physics 2026-05-05 John Barentine , Aparna Venkatesan

Astronomy is the study of the Universe and all the objects that it comprises. Our attention is therefore usually focused beyond Earth, home to the only form of life known today. However, how can we continue to explore the secrets of the…

Direct detection and characterization of Earth-like planets around Sun-like stars is a core task for evaluating the prevalence of habitability and life in the Universe. Here, we discuss a promising option for achieving this goal, which is…

Instrumentation and Methods for Astrophysics · Physics 2021-09-03 Markus Janson , Thomas Henning , Sascha P. Quanz , Ruben Asensio-Torres , Lars Buchhave , Oliver Krause , Enric Palle

The Square Kilometre Array (SKA) will operate in frequency ranges often used by military radar and other communications technology. It has been shown that if Extraterrestrial Intelligences (ETIs) communicate using similar technology, then…

Earth and Planetary Astrophysics · Physics 2015-05-19 D. H. Forgan , R. C. Nichol

In SETI, when searching for "beacons" -- transmissions intended for us and meant to get our attention -- one must guess the appropriate frequency to search by considering what frequencies would be universally obvious to other species. This…

Instrumentation and Methods for Astrophysics · Physics 2023-06-22 Jason T. Wright

After having left the heliosphere, Voyager 1 and Voyager 2 continue to travel through interstellar space. The Pioneer 10, Pioneer 11, and New Horizons spacecraft are also on paths to pass the heliopause. These spacecraft have communicated…

Solar and Stellar Astrophysics · Physics 2023-04-18 Reilly Derrick , Howard Isaacson

Interstellar signals might be intermittent for many reasons, such as targeted sequential transmissions, or isotropic broadcasts that are not on continuously, or many other reasons. The time interval between such signals would be important,…

Instrumentation and Methods for Astrophysics · Physics 2021-10-26 Robert H. Gray

Over the past decade, astronomers have been using an increasingly larger number of web-based applications and archives to conduct their research. However, despite the early success in creating links across projects and data centers, the…

Instrumentation and Methods for Astrophysics · Physics 2015-03-17 Alberto Accomazzi , Michael J. Kurtz , Stephen S. Murray

Ultra Fast Astronomy is a new frontier becoming enabled by improved detector technology allowing discovery of optical transients on millisecond to nanosecond time scales. These may reveal counterparts of energetic processes such as fast…

Instrumentation and Methods for Astrophysics · Physics 2021-11-08 Mikhail Denissenya , Eric V. Linder

Because of the scheduled GLAST mission by NASA, there is strong scientific justification for preparation for very extensive blazar monitoring in the optical bands to exploit the opportunity to learn about blazars through the correlation of…

Astrophysics · Physics 2007-05-23 J. R. Mattox

Nowadays many telescopes around the world are automated and some networks of robotic telescopes are active or planned as shown by the lists we draw up. Such equipment could be used for the training of students and for science in the…

Astrophysics · Physics 2007-05-23 F. R. Querci , M. Querci

We now know that the outer solar system is host to at least six diverse planetary ring systems, each of which is a scientifically compelling target with the potential to inform us about the evolution, history and even the internal structure…

We explore a much-neglected area of SETI: solar system techno-signatures. As our cursory solar system exploration consolidates into commercial industrialisation, it is crucial that we determine what to look for and where. We first consider…

Instrumentation and Methods for Astrophysics · Physics 2025-10-02 Alex Ellery

This paper explores how automation and artificial intelligence (AI) are transforming U.S. cyber diplomacy. Leveraging these technologies helps the U.S. manage the complexity and urgency of cyber diplomacy, improving decision-making,…

Cryptography and Security · Computer Science 2024-11-22 Michael Stoltz

ESA and NASA are studying projects having a tremendous return on variable star research. Other national space agencies are also studying or developing projects of smaller costs but with impressive returns. The projects range from global…

Astrophysics · Physics 2007-05-23 Laurent Eyer

Interstellar radar is a potential intermediate step between passive observation of exoplanets and interstellar exploratory missions. Compared to passive observation, it has the traditional advantages of radar astronomy. It can measure…

Instrumentation and Methods for Astrophysics · Physics 2015-06-12 Louis K. Scheffer

We discuss a Galaxy-wide coordinated signaling scheme with which a SETI observer needs to examine a tiny fraction of the sky. The target sky direction is determined as a function of time, based on high-precision measurements of a progenitor…

Instrumentation and Methods for Astrophysics · Physics 2019-04-24 Naoki Seto

Pulsars have at least two impressive applications. First, they can be used as highly accurate clocks, comparable in stability to atomic clocks; secondly, a small subset of pulsars, millisecond X-ray pulsars, provide all the necessary…

Popular Physics · Physics 2017-11-28 Clement Vidal