Log in

Relevant bibliographies by topics / Extraterrestrial civilizations / Journal articles

To see the other types of publications on this topic, follow the link: Extraterrestrial civilizations.

Journal articles on the topic 'Extraterrestrial civilizations'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Extraterrestrial civilizations.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Sotos, John G. "Biotechnology and the lifetime of technical civilizations." International Journal of Astrobiology 18, no. 05 (2019): 445–54. http://dx.doi.org/10.1017/s1473550418000447.

Full text

Abstract:

AbstractThe number of people able to end Earth's technical civilization has heretofore been small. Emerging dual-use technologies, such as biotechnology, may give similar power to thousands or millions of individuals. To quantitatively investigate the ramifications of such a marked shift on the survival of both terrestrial and extraterrestrial technical civilizations, this paper presents a two-parameter model for civilizational lifespans, i.e. the quantity L in Drake's equation for the number of communicating extraterrestrial civilizations. One parameter characterizes the population lethality

APA, Harvard, Vancouver, ISO, and other styles

2

Rodríguez, Elio. "Introducing the Exoplanet Escape Factor and the Fishbowl Worlds (two conceptual tools for the search for extra terrestrial civilizations)." Journal of the British Interplanetary Society 76, no. 10 (2024): 365–68. http://dx.doi.org/10.59332/jbis-076-10-0365.

Full text

Abstract:

The search for extraterrestrial intelligence on exoplanets is a rich field of conceptual exploration. Author introduces two definitions that could help to narrow down the possibilities that an extraterrestrial civilization may or may not have initiated exploration of its own star system and beyond. It is concluded that in some cases certain extraterrestrial civilizations may not be able to leave their home worlds before their biological extinction, purely because of physical limitations. Keywords: SETI, ETI, Exoplanets, Alien Civilizations, Alien Exploration

APA, Harvard, Vancouver, ISO, and other styles

3

Hair, Thomas W. "Temporal dispersion of the emergence of intelligence: an inter-arrival time analysis." International Journal of Astrobiology 10, no. 2 (2011): 131–35. http://dx.doi.org/10.1017/s1473550411000024.

Full text

Abstract:

AbstractMany reasons for why extraterrestrial intelligences might avoid communications with our civilization have been proposed. One possible scenario is that all civilizations follow the lead of some particularly distinguished civilization. This paper will examine the impact the first successful civilization could have on all other subsequent civilizations within its sphere of influence and the ramifications of this as it relates to the Fermi Paradox. Monte Carlo simulation is used to map the inter-arrival times of early civilizations and to highlight the immense epochs of time that the earli

APA, Harvard, Vancouver, ISO, and other styles

4

Charbonneau, Rebecca. "Imaginative Cosmos: The Impact of Colonial Heritage in Radio Astronomy and the Search for Extraterrestrial Intelligence." American Indian Culture and Research Journal 45, no. 1 (2021): 71–94. http://dx.doi.org/10.17953/aicrj.45.1.charbonneau.

Full text

Abstract:

Astronomers conducting searches for extraterrestrial intelligence (SETI) have long been interested in the history of “first contact” between foreign civilizations as a proxy for extraterrestrial contact and have often employed frontier metaphors and colonial analogies in their pursuit of extraterrestrials. This article shows this language was more than mere rhetoric; drawing from the history of Orientalism and the US frontier, this article investigates SETI’s physical and disciplinary homes, ultimately arguing that, even when attempting to convey universality, SETI scientist’s pursuit of the a

APA, Harvard, Vancouver, ISO, and other styles

5

Antonov, Alexander Alexandrovich. "Hidden Multiverse Extraterrestrial Super Civilizations." Natural Science 09, no. 03 (2017): 43–62. http://dx.doi.org/10.4236/ns.2017.93005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Strelkov, Evgeniy. "Radio hunt for extraterrestrial civilizations." Энергия: экономика, техника, экология, no. 4 (472) (2024): 2. https://doi.org/10.7868/s0233361924040013.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Rampino, Michael R. "Super-Eruptions and the Search for Extraterrestrial Intelligence (SETI)." Symposium - International Astronomical Union 213 (2004): 439–44. http://dx.doi.org/10.1017/s0074180900193684.

Full text

Abstract:

Volcanic super-eruptions that produce >1000 km3 of ejected material and ≥ 1000 Mt (1015g) of stratospheric aerosols and sub-micron dust may be capable of creating global climatic disturbances sufficient to cause a severe setback or crash of modern civilization. Eruptions of similar magnitude are estimated to occur on average about every 50000 to 100000 years, which may be considerably more frequent than impacts by asteroids and comets that could cause similar climatic disasters. Prediction, prevention, and mitigation of global volcanic climatic disasters are potentially more difficult than

APA, Harvard, Vancouver, ISO, and other styles

8

Beskin, Gregory, Nikolai Borisov, Victoria Komarova, et al. "The Search for Extraterrestrial Civilizations in Optical Range – Methods, Objects, Results." International Astronomical Union Colloquium 161 (January 1997): 595–600. http://dx.doi.org/10.1017/s025292110001513x.

Full text

Abstract:

AbstractPerspectives and possibilities of search for signals of extraterrestrial civilizations in optical range are discussed. Two criteria of an artificial origin of an optical emission – the variations of its intensity which have a time structure of semiotic character and the presence of narrow laser lines are analyzed. For detection and study of these signals we propose to investigate the astronomical objects under suspection with extremely high time resolution – 10−7s. To solve this problem we use a special hard/software photometrical complex MANIA (Multichannel Analysis of Nanosecond Inte

APA, Harvard, Vancouver, ISO, and other styles

9

Baghram, Shant. "In Search of Extraterrestrial Artificial Intelligence Through Dyson Sphere–like Structures around Primordial Black Holes." Astrophysical Journal 978, no. 2 (2025): 132. https://doi.org/10.3847/1538-4357/ad9b10.

Full text

Abstract:

Abstract 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 is that there is a chance that intelligent life will be followed by advanced civilization equipped or even dominated by artificial intelligence (AI). In this work, we categorize advanced civilizations (on an equal footing, an AI-dominated civilization) on the Kardashev scale. We propose a new scale known as the space exploration dista

APA, Harvard, Vancouver, ISO, and other styles

10

Narens, Louis. "Surmising Cognitive Universals for Extraterrestrial Intelligences." International Astronomical Union Colloquium 161 (January 1997): 561–70. http://dx.doi.org/10.1017/s0252921100015104.

Full text

Abstract:

AbstractCognitive universals are concepts that our civilization and technologically advanced extraterrestrial civilizations can easily interpret. The universality of certain mathematically and perceptually based concepts are discussed. It is argued that continuously based concepts are more fertile ground for surmising cognitive universals than discretely based ones, and in particular, one should be suspicious of the use of inductively based numerical concepts, including the totality of natural numbers. Ideas about intuitive evolutionary theory, physical and perceptual invariance, and the effic

APA, Harvard, Vancouver, ISO, and other styles

11

Ivanov, Valentin D., Juan Carlos Beamín, Claudio Cáceres, and Dante Minniti. "A qualitative classification of extraterrestrial civilizations." Astronomy & Astrophysics 639 (July 2020): A94. http://dx.doi.org/10.1051/0004-6361/202037597.

Full text

Abstract:

Context. Interest in searches for extraterrestrial civilizations (ETCs) has been boosted in recent decades by the discovery of thousands of exoplanets. Aims. We turn to the classification of ETCs for new considerations that may help to design better strategies for searching for ETCs. Methods. This study is based on analogies with our own biological, historical, technological, and scientific development. We took a basic taxonomic approach to ETCs and investigated the implications of the new classification on ETC evolution and observational patterns. Finally, we used the quantitative scheme of K

APA, Harvard, Vancouver, ISO, and other styles

12

Horvat, Marko, Anamari Nakić, and Ivana Otočan. "Impact of technological synchronicity on prospects for CETI." International Journal of Astrobiology 11, no. 1 (2011): 51–59. http://dx.doi.org/10.1017/s1473550411000322.

Full text

Abstract:

AbstractFor over 50 years, astronomers have searched the skies for evidence of electromagnetic signals from extraterrestrial (ET) civilizations that have reached or surpassed our level of technological development. Although often overlooked or given as granted, the parallel use of an equivalent communication technology is a necessary prerequisite for establishing contact in both leakage and deliberate messaging strategies. Civilization advancements, especially accelerating change and exponential growth, lessen the perspective for a simultaneous technological status of civilizations thus puttin

APA, Harvard, Vancouver, ISO, and other styles

13

Starling, Jonathan, and Duncan H. Forgan. "Virulence as a model for interplanetary and interstellar colonization – parasitism or mutualism?" International Journal of Astrobiology 13, no. 1 (2013): 45–52. http://dx.doi.org/10.1017/s1473550413000347.

Full text

Abstract:

AbstractIn the light of current scientific assessments of human-induced climate change, we investigate an experimental model to inform how resource-use strategies may influence interplanetary and interstellar colonization by intelligent civilizations. In doing so, we seek to provide an additional aspect for refining the famed Fermi Paradox. The model described is necessarily simplistic, and the intent is to simply obtain some general insights to inform and inspire additional models. We model the relationship between an intelligent civilization and its host planet as symbiotic, where the relati

APA, Harvard, Vancouver, ISO, and other styles

14

Rodríguez, Elio Quiroga. "Frank Drake is Alive! (Rethinking the Drake Equation for the Search For Biological Life)." Journal of the British Interplanetary Society 77, no. 4 (2024): 114–18. http://dx.doi.org/10.59332/jbis-077-04-0114.

Full text

Abstract:

In 1961, astronomer Frank Drake formulated the Drake Equation as a cornerstone for scientific discourse regarding the prevalence of communicative extraterrestrial civilizations within the Milky Way galaxy. This equation, often referred to as the “Classic Drake Equation”, outlines the key factors influencing the number of potential civilizations with which we might establish communication. This article submerges into the Drake Equation and proposes a simplified version focused on the broader detection of extraterrestrial non-intelligent life. The established terms of the equation, such as the r

APA, Harvard, Vancouver, ISO, and other styles

15

Tough, Allen, and Guillermo A. Lemarchand. "Searching for Extraterrestrial Technologies Within Our Solar System." Symposium - International Astronomical Union 213 (2004): 487–90. http://dx.doi.org/10.1017/s0074180900193763.

Full text

Abstract:

We speculate about possible cosmic exploration by extraterrestrial civilizations using interstellar smart probes. We call attention to some emerging technologies that may be used for interstellar exploration. We estimate that advanced civilizations may already have these technologies and may be using them to contact their galactic neighbors. We explore some observational consequences of these contacting strategies.

APA, Harvard, Vancouver, ISO, and other styles

16

Barlow, Martin T. "Galactic exploration by directed self-replicating probes, and its implications for the Fermi paradox." International Journal of Astrobiology 12, no. 1 (2012): 63–68. http://dx.doi.org/10.1017/s1473550412000419.

Full text

Abstract:

AbstractThis paper proposes a long-term scheme for robotic exploration of the galaxy, and then considers the implications in terms of the ‘Fermi paradox’ and our search for extraterrestrial intelligence (ETI). We discuss the ‘Galactic ecology’ of civilizations in terms of the parameters T (time between ET civilizations arising) and L, the lifetime of these civilizations. Six different regions are described.

APA, Harvard, Vancouver, ISO, and other styles

17

Miletić, Tomislav. "Extraterrestrial artificial intelligences and humanity’s cosmic future." Journal of Ethics and Emerging Technologies 25, no. 1 (2015): 56–73. http://dx.doi.org/10.55613/jeet.v25i1.41.

Full text

Abstract:

A probable solution of the Fermi paradox, and a necessary step in humanity’s cosmic development, is the construction of a Bracewell-Von Neumann (BN) Artificial General Intelligence (AGI). The use of BN probes is the most plausible method of initial galactic exploration and communication for advanced ET civilizations, and our own cosmic evolution lies firmly in the utilization of, and cooperation with, AGI agents. To establish these claims, I explore the most credible developmental path from carbon-based life forms to planetary civilizations and AI creation. I consider the likely physical chara

APA, Harvard, Vancouver, ISO, and other styles

18

Haliki, Emir. "Broadcast network model of pulsars as beacons of extraterrestrial civilizations." International Journal of Astrobiology 18, no. 05 (2018): 455–62. http://dx.doi.org/10.1017/s1473550418000459.

Full text

Abstract:

AbstractAccording to the Kardashev scale, likely extraterrestrial civilizations above Type-I might use natural energy sources of the Universe, which is also true for transmitting their signals out to distances. A variety of studies have shown that radio pulsars are most likely candidates for this. First, the current study examined how the radio beams of pulsars scan across their environment. Later when the radio beams of pulsars have been modulated, a network model has been proposed on how many habitable planets possible to be home for other assumed advanced civilizations could be reached. It

APA, Harvard, Vancouver, ISO, and other styles

19

Werthimer, Dan, and Mary Kate Morris. "Are We Alone? The Search for Extraterrestrial Civilizations." Leonardo 37, no. 1 (2004): 39. http://dx.doi.org/10.1162/002409404772828085.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Wandel, Amri. "On the abundance of extraterrestrial life after the Kepler mission." International Journal of Astrobiology 14, no. 3 (2015): 511–16. http://dx.doi.org/10.1017/s1473550414000767.

Full text

Abstract:

AbstractThe data recently accumulated by the Kepler mission have demonstrated that small planets are quite common and that a significant fraction of all stars may have an Earth-like planet within their habitable zone. These results are combined with a Drake-equation formalism to derive the space density of biotic planets as a function of the relatively modest uncertainty in the astronomical data and of the (yet unknown) probability for the evolution of biotic life, Fb. I suggest that Fb may be estimated by future spectral observations of exoplanet biomarkers. If Fb is in the range 0.001–1, the

APA, Harvard, Vancouver, ISO, and other styles

21

Forgan, Duncan H. "Spatio-temporal constraints on the zoo hypothesis, and the breakdown of total hegemony." International Journal of Astrobiology 10, no. 4 (2011): 341–47. http://dx.doi.org/10.1017/s147355041100019x.

Full text

Abstract:

AbstractThe Zoo Hypothesis posits that we have not detected extraterrestrial intelligences (ETIs) because they deliberately prevent us from detecting them. While a valid solution to Fermi's Paradox, it is not particularly amenable to rigorous scientific analysis, as it implicitly assumes a great deal about the sociological structure of a plurality of civilizations. Any attempt to assess its worth must begin with its most basic assumption – that ETIs share a uniformity of motive in shielding Earth from extraterrestrial contact. This motive is often presumed to be generated by the influence of t

APA, Harvard, Vancouver, ISO, and other styles

22

Appell, David. "The technosignature researcher on the lookout for exo-civilizations." Physics World 35, no. 2 (2022): 31–33. http://dx.doi.org/10.1088/2058-7058/35/02/33.

Full text

Abstract:

Meet Sofia Sheikh, one of a handful of postdoctoral researchers who have specialized in the search for extraterrestrial intelligence. She talks to David Appell about strange signals, Star Trek, picking a tricky research field and the importance of mentorship.

APA, Harvard, Vancouver, ISO, and other styles

23

Wandel, Amri. "The Fermi Paradox Revisited: Technosignatures and the Contact Era." Astrophysical Journal 941, no. 2 (2022): 184. http://dx.doi.org/10.3847/1538-4357/ac9e00.

Full text

Abstract:

Abstract 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 biotic planets are common, putative advanced civilizations may send probes not to any planet showing biosignatures, but rather to planets with technosignatures, such as radio broadcasts. The contact probability is defined as the chance to find a nearby civilization located close enough so that it could have detected the earliest radio emissions (

APA, Harvard, Vancouver, ISO, and other styles

24

Weinberger, R., and H. Hartl. "A search for ‘frozen optical messages’ from extraterrestrial civilizations." International Journal of Astrobiology 1, no. 1 (2002): 71–73. http://dx.doi.org/10.1017/s1473550402001040.

Full text

Abstract:

For a quarter of a century we have been engaged in a systematic examination of high-quality photographic (optical) sky surveys in the search for new celestial bodies of various kinds. It took about 5000 hours to cover the whole northern celestial hemisphere and half of the southern one. In total, about 12000 new objects were discovered. From the very beginning of our programme we also searched for objects (or groupings of them) of rather peculiar morphology. The motivation was to detect objects revealing exceptional physical processes, on the one hand, but also to discover constructions possib

APA, Harvard, Vancouver, ISO, and other styles

25

Galera, E., G. R. Galanti, and O. Kinouchi. "Invasion percolation solves Fermi Paradox but challenges SETI projects." International Journal of Astrobiology 18, no. 4 (2018): 316–22. http://dx.doi.org/10.1017/s1473550418000101.

Full text

Abstract:

AbstractNon-homogeneous fractal-like colonization processes, where the cluster of visited sites has large voids and grows slowly, could explain the negative results of Search for Extraterrestrial Intelligence (SETI) preserving the possibility of a galactic spanning civilization. Here we present a generalized invasion percolation model to illustrate a minimal colonization process with large voids and delayed colonization. Spatial correlation between unvisited sites, in the form of large empty regions, suggests that to search civilizations in the Sun neighbourhood may be a misdirected SETI strat

APA, Harvard, Vancouver, ISO, and other styles

26

Sullivan, Woodruff T., and Kenneth J. Mighell. "A Milky Way Search Strategy for Extraterrestrial Intelligence." Symposium - International Astronomical Union 112 (1985): 419. http://dx.doi.org/10.1017/s0074180900146777.

Full text

Abstract:

We assume that the density of sites of technical civilizations emitting suitable signals (whether purposeful or unintentional) is proportional to the stellar density at any location in our Galaxy, as modelled by Bahcall and Soneira (1980). A wide variety of possible radio luminosity functions Ø(L) for these civilizations is then assumed and for each the number of detectable signals per square degree over the sky is calculated. We find that most detectable signals occur at galactic latitudes of 10° or less and longitudes within 90° of the galactic center, a region which covers only 9 per cent o

APA, Harvard, Vancouver, ISO, and other styles

27

Huang, Xiuqi. "Universe of Pluralism: Extraterrestrial Intelligence in Liu Cixin's Short Stories." Science Fiction Studies 51, no. 2 (2024): 238–57. http://dx.doi.org/10.1353/sfs.2024.a931154.

Full text

Abstract:

ABSTRACT: This paper examines extraterrestrial intelligence in the short stories of Chinese science fiction writer Liu Cixin and their relation to the alien civilization in Liu's immensely successful Remembrance of Earth's Past trilogy. I will discuss the topic from three aspects: extraterrestrial intelligence's role as both metaphorical and literal mirrors in Liu's short stories; various alien worldviews and existential states that derive their conflicting diversity from the scientific and humanistic divide in the literary tradition of Chinese science fiction; aliens that represent either the

APA, Harvard, Vancouver, ISO, and other styles

28

Forgan, D. H. "A numerical testbed for hypotheses of extraterrestrial life and intelligence." International Journal of Astrobiology 8, no. 2 (2009): 121–31. http://dx.doi.org/10.1017/s1473550408004321.

Full text

Abstract:

AbstractThe 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 civilizations resident in the Milky Way, and by the Fermi Paradox, glibly stated as: ‘If they are there, where are they?’. Both rely on using average values of key parameters, such as the mean signal lifetime of a communicating civilization. A more accurate answer must take into account the distribution of stellar, planetary and biological attributes in the galaxy, as well as the stochastic nature of evolution

APA, Harvard, Vancouver, ISO, and other styles

29

Papagiannis, Michael D. "A Look into the Future." Symposium - International Astronomical Union 112 (1985): 543–46. http://dx.doi.org/10.1017/s0074180900146972.

Full text

Abstract:

The quest for extraterrestrial life and for other stellar civilizations has finally become an international scientific endeavor. As our technology advances and major astronomical observatories are established in space, we will be able to gain a better understanding of ourselves and the Cosmos.

APA, Harvard, Vancouver, ISO, and other styles

30

Forgan, Duncan H. "The Galactic Club or Galactic Cliques? Exploring the limits of interstellar hegemony and the Zoo Hypothesis." International Journal of Astrobiology 16, no. 4 (2016): 349–54. http://dx.doi.org/10.1017/s1473550416000392.

Full text

Abstract:

AbstractThe Zoo solution to Fermi's Paradox proposes that extraterrestrial intelligences (ETIs) have agreed to not contact the Earth. The strength of this solution depends on the ability for ETIs to come to agreement, and establish/police treaties as part of a so-called ‘Galactic Club’. These activities are principally limited by the causal connectivity of a civilization to its neighbours at its inception, i.e. whether it comes to prominence being aware of other ETIs and any treaties or agreements in place. If even one civilization is not causally connected to the other members of a treaty, th

APA, Harvard, Vancouver, ISO, and other styles

31

Livio, Mario. "How Rare Are Extraterrestrial Civilizations, and When Did They Emerge?" Astrophysical Journal 511, no. 1 (1999): 429–31. http://dx.doi.org/10.1086/306668.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Thomas, Alex, Natalie LeBaron, Luca Angeleri, et al. "The Local Galactic Transient Survey Applied to an Optical Search for Directed Intelligence." Astrophysical Journal 985, no. 1 (2025): 60. https://doi.org/10.3847/1538-4357/adc43d.

Full text

Abstract:

Abstract We discuss our transient search for directed energy systems in local galaxies, with calculations indicating the ability of modest searches to detect optical Search for Extraterrestrial Intelligence sources in the closest galaxies. Our analysis follows P. Lubin, where a messenger civilization follows a beacon strategy we call “intelligent targeting.” We plot the required laser time to achieve a signal-to-noise ratio of 10 and find the time for a blind transmission to target all stars in the Milky Way to be achievable for local galactic civilizations. As high cadence and sky coverage is

APA, Harvard, Vancouver, ISO, and other styles

33

Delev, Hristo, and Todorka L. Dimitrova. "A simple approach to solving the Drake equation." South Florida Journal of Development 6, no. 2 (2025): e4970. https://doi.org/10.46932/sfjdv6n2-007.

Full text

Abstract:

Are we alone in the Universe? What is the probability of finding intelligent extraterrestrial civilizations in our galaxy? By analyzing the essential conditions for springing up and maintaining life on our planet, we may arrive at the conclusion that it may be not a unique phenomenon. During the past decades, the astrophysicists have put a lot of effort into searching for earthlike planets. However, no reliable proofs of life out of the Earth have been found so far. The Drake equation, proposed by Frank Drake in 1961, is a theoretical model for estimating the probability of finding intelligent

APA, Harvard, Vancouver, ISO, and other styles

34

Horvat, Marko. "Calculating the probability of detecting radio signals from alien civilizations." International Journal of Astrobiology 5, no. 2 (2006): 143–49. http://dx.doi.org/10.1017/s1473550406003004.

Full text

Abstract:

Although it might not be self-evident, it is in fact entirely possible to calculate the probability of detecting alien radio signals by understanding what types of extraterrestrial radio emissions can be expected and what properties these emissions can have. Using the Drake equation as the obvious starting point, and logically identifying and enumerating constraints of interstellar radio communications, may yield the possibility of detecting a genuine alien radio signal.

APA, Harvard, Vancouver, ISO, and other styles

35

Holly, Donald H. "Talking to the Guy on the Airplane." American Antiquity 80, no. 3 (2015): 615–17. http://dx.doi.org/10.1017/s0002731600003577.

Full text

Abstract:

There's a popular meme that my archaeology friends have been circulating on social media lately: a picture of Giorgio Tsoukalos, a producer of the popular History Channel show Ancient Aliens, overlaid with the caption “I'm not saying it was aliens, but it was aliens.” The caption is a play on Tsoukalos's and others’ claims that the archaeological and historical record contains ample evidence for alien visits to earth in antiquity. To wit, past episodes of the show have suggested that Kachinas, Egyptian hieroglyphics, and indigenous rock art depict aliens; that much of the monumental art and ar

APA, Harvard, Vancouver, ISO, and other styles

36

Haqq-Misra, Jacob, and Thomas J. Fauchez. "Galactic Settlement of Low-mass Stars as a Resolution to the Fermi Paradox." Astronomical Journal 164, no. 6 (2022): 247. http://dx.doi.org/10.3847/1538-3881/ac9afd.

Full text

Abstract:

Abstract An expanding civilization could spread rapidly through the Galaxy, so the absence of extraterrestrial settlement in the solar system implies that such expansionist civilizations do not exist. This argument, often referred to as the Fermi paradox, typically assumes that expansion would proceed uniformly through the Galaxy, but not all stellar types may be equally useful for a long-lived civilization. We suggest that low-mass stars, and K-dwarf stars in particular, would be ideal migration locations for civilizations that originate in a G-dwarf system. We use a modified form of the Drak

APA, Harvard, Vancouver, ISO, and other styles

37

Chennamangalam, Jayanth, Andrew P. V. Siemion, D. R. Lorimer, and Dan Werthimer. "Jumping the energetics queue: Modulation of pulsar signals by extraterrestrial civilizations." New Astronomy 34 (January 2015): 245–49. http://dx.doi.org/10.1016/j.newast.2014.07.011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Ashkenazi, M. "On the applicability of human cultural models to extraterrestrial intelligence civilizations." Acta Astronautica 42, no. 10-12 (1998): 739–43. http://dx.doi.org/10.1016/s0094-5765(98)00034-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Haliki, Emir. "Broadcast network model of pulsars as beacons of extraterrestrial civilizations—ERRATUM." International Journal of Astrobiology 19, no. 1 (2019): 99. http://dx.doi.org/10.1017/s1473550419000090.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Cartin, Daniel. "Upper limits on the probability of an interstellar civilization arising in the local Solar neighbourhood." International Journal of Astrobiology 14, no. 4 (2015): 571–75. http://dx.doi.org/10.1017/s1473550415000105.

Full text

Abstract:

AbstractAt this point in time, there is very little empirical evidence on the likelihood of a space-faring species originating in the biosphere of a habitable world. However, there is a tension between the expectation that such a probability is relatively high (given our own origins on Earth), and the lack of any basis for believing the Solar System has ever been visited by an extraterrestrial colonization effort. From the latter observational fact, this paper seeks to place upper limits on the probability of an interstellar civilization arising on a habitable planet in its stellar system, usi

APA, Harvard, Vancouver, ISO, and other styles

41

De la Torre, Gabriel G. "Toward a new cosmic consciousness: Psychoeducational aspects of contact with extraterrestrial civilizations." Acta Astronautica 94, no. 2 (2014): 577–83. http://dx.doi.org/10.1016/j.actaastro.2013.08.021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Evseev, Aleksandr. "Imagination and the international law: Book review: Bohlander M. Contact with extraterrestrial intelligence and human law: The applicability of rules of war and human rights. Leiden : Brill, 2023." Meždunarodnoe pravosudie 15, no. 1 (2025): 150–63. https://doi.org/10.21128/2226-2059-2025-1-150-163.

Full text

Abstract:

This article is a review of the book, written by the German lawyer and international judge M.Bohlander, dedicated to the search for contacts with extraterrestrial civilizations. The author constructs a number of concepts with the help of which such research is given a legal dimension. In particular, this concerns the concept of “metalaw”, which is a certain set of norms and principles applicable in relations with artificial intelligence. The existing international legal regulation of this issue is clarified. Based on futurological works and science fiction, the author of the book tries to iden

APA, Harvard, Vancouver, ISO, and other styles

43

Forgan, Duncan H. "Exoplanet transits as the foundation of an interstellar communications network." International Journal of Astrobiology 18, no. 3 (2018): 189–98. http://dx.doi.org/10.1017/s1473550417000283.

Full text

Abstract:

AbstractTwo fundamental problems for extraterrestrial intelligences (ETIs) attempting to establish interstellar communication are timing and energy consumption. Humanity's study of exoplanets via their transit across the host star highlights a means of solving both problems. An ETI ‘A’ can communicate with ETI ‘B’ if B is observing transiting planets in A's star system, either by building structures to produce artificial transits observable by B, or by emitting signals at B during transit, at significantly lower energy consumption than typical electromagnetic transmission schemes. This can pro

APA, Harvard, Vancouver, ISO, and other styles

44

Osmanov, Z. N., and V. I. Berezhiani. "Prospects of SETI by small size optical telescopes." Serbian Astronomical Journal, no. 00 (2022): 3. http://dx.doi.org/10.2298/saj210922003o.

Full text

Abstract:

In the present manuscript we consider the possibility of conducting SETI with small-size (with diameters less than 1 m) optical telescopes. Calculations are performed for typical parameters of the mentioned type of telescopes. In particular, we show that the techno-signatures of Type-2.x and Type-3.x civilizations might be detected. It is demonstrated that it is possible to detect hot megastructures (up to 4000 K) built around Main Sequence stars and pulsars, as well as von Neumann extraterrestrial probes.

APA, Harvard, Vancouver, ISO, and other styles

45

Cirkovic, M. M., and M. Radujkov. "On the maximal quantity of processed information in the physical eschatological context." Serbian Astronomical Journal, no. 163 (2001): 53–56. http://dx.doi.org/10.2298/saj0163053c.

Full text

Abstract:

An estimate of the maximal computing power available to advanced extraterrestrial or future (post)human civilizations is presented. It is shown that the fundamental thermodynamical considerations may lead to a quantitative estimate of the largest quantity of information to be processed by conceivable computing devices. This issue is interesting from the point of view of physical eschatology, as well as general futurological topics, like the degree of confidence in long-term physical predictions or viability of the large-scale simulations of complex systems.

APA, Harvard, Vancouver, ISO, and other styles

46

McGiveron, Rafeeq O. "Heinlein’s Inhabited Solar System, 1940-1952." Science Fiction Studies 23, Part 2 (1996): 245–52. https://doi.org/10.1525/sfs.23.2.0245.

Full text

Abstract:

One aspect common to much of Robert A. Heinlein’s early work, from the Future History stories through the Scribners juveniles, is his depiction of a Solar System populated in the past or the present by four different extraterrestrial civilizations. These worlds, some extinct and some thriving, serve the purpose of humbling the brash young human species. The self-destructive failures of Luna and Lucifer and the unexpected flourishing of Venus and Mars remind us that humans still have far to progress both intellectually and morally. (RM)

APA, Harvard, Vancouver, ISO, and other styles

47

Johnson, Owen A., Vishal Gajjar, Evan F. Keane, et al. "A Simultaneous Dual-site Technosignature Search Using International LOFAR Stations." Astronomical Journal 166, no. 5 (2023): 193. http://dx.doi.org/10.3847/1538-3881/acf9f5.

Full text

Abstract:

Abstract 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 be transmitted by other civilizations, motivating technosignature searches across the entire radio spectrum. In this endeavor, the low-frequency radio band has remained largely unexplored; with prior radio searches primarily above 1 GHz. In this survey at 110–190 MHz, observations of 1,631,198 targets from TESS and Gaia are reported. Observations to

APA, Harvard, Vancouver, ISO, and other styles

48

Lampton, Michael. "Information-driven societies and Fermi's paradox." International Journal of Astrobiology 12, no. 4 (2013): 312–13. http://dx.doi.org/10.1017/s1473550413000153.

Full text

Abstract:

AbstractFermi's paradox is founded on the idea that one or more Galactic extraterrestrial civilizations (ETCs) existed long ago and sustained exploration for millions of years, but in spite of their advanced knowledge, they could not find a way to explore the Galaxy other than with fleets of starships or self replicating probes. Here, I question this second assumption: if advanced technology generally allows long-distance remote sensing, and if ETCs were motivated by gaining information rather than conquest or commerce, then such voyages would be unnecessary, thereby resolving Fermi's paradox.

APA, Harvard, Vancouver, ISO, and other styles

49

Dick, Steven J. "Cultural evolution, the postbiological universe and SETI." International Journal of Astrobiology 2, no. 1 (2003): 65–74. http://dx.doi.org/10.1017/s147355040300137x.

Full text

Abstract:

The Biological Universe (Dick 1996) analysed the history of the extraterrestrial life debate, documenting how scientists have assessed the chances of life beyond Earth during the 20th century. Here I propose another option – that we may in fact live in a postbiological universe, one that has evolved beyond flesh and blood intelligence to artificial intelligence that is a product of cultural rather than biological evolution. MacGowan & Ordway (1966), Davies (1995) and Shostak (1998), among others, have broached the subject, but the argument has not been given the attention it is due, nor ha

APA, Harvard, Vancouver, ISO, and other styles

50

Ilin, Alexander B. "... we lit beacons... in the Universe only we are alone ..." Journal of Cosmology, Filaments and Astrobiology 1, no. 2 (2022): 23–35. http://dx.doi.org/10.54216/jcfa.010205.

Full text

Abstract:

Superluminal contact with extraterrestrial civilizations can be carried out either by observing the appearance of regular gaps in the CMB relic microwave background or by manipulating the state of quantum fluctuation using the dynamic Casimir effect; potentially, it is also possible to observe patterns in the relic background of Goldstone bosons – axions. It is more correct to evaluate the search for a signal on an axion background of noise as a spectrum of intermediate NeutralA - gaps in various relict backgrounds that form a recognizable pattern of NonA formed NeutralA and AntiA, which is th

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!