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"Extraterrestrial intelligence"
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Searching for extraterrestrial intelligence : SETI past, present, and future
This book is a collection of essays written by those who have led, and continue to lead, the search for extraterrestrial intelligence. It reviews the history of the subject, details present-day science and technology, and looks ahead to the future.
Book
Discovery of Peculiar Periodic Spectral Modulations in a Small Fraction of Solar-type Stars
A Fourier transform analysis of 2.5 million spectra in the Sloan Digital Sky Survey was carried out to detect periodic spectral modulations. Signals having the same period were found in only 234 stars overwhelmingly in the F2 to K1 spectral range. The signals cannot be caused by instrumental or data analysis effects because they are present in only a very small fraction of stars within a narrow spectral range and because signal-to-noise ratio considerations predict that the signal should mostly be detected in the brightest objects, while this is not the case. We consider several possibilities, such as rotational transitions in molecules, rapid pulsations, Fourier transform of spectral lines, and signals generated by extraterrestrial intelligence (ETI). They cannot be generated by molecules or rapid pulsations. It is highly unlikely that they come from the Fourier transform of spectral lines because too many strong lines located at nearly periodic frequencies are needed. Finally, we consider the possibility, predicted in a previous published paper, that the signals are caused by light pulses generated by ETI to makes us aware of their existence. We find that the detected signals have exactly the shape of an ETI signal predicted in the previous publication and are therefore in agreement with this hypothesis. The fact that they are only found in a very small fraction of stars within a narrow spectral range centered near the spectral type of the Sun is also in agreement with the ETI hypothesis. However, at this stage, this hypothesis needs to be confirmed with further work. Although unlikely, there is also a possibility that the signals are due to highly peculiar chemical compositions in a small fraction of galactic halo stars.
Journal Article
Have aliens visited Earth?
\"In this book, a mysterious figure called the Mystery M aster sets you the challenge of iinvestigating all the myths and sightings surrounding aliens and encourages you to analyse the information that you have gathered\"-- Provided by publisher.
Book
Science, SETI and mathematics
Mathematics is as much a part of our humanity as music and art. And it is our mathematics that might be understandable, even familiar, to a distant race and might provide the basis for mutual communication. This book discusses, in a conversational way, the role of mathematics in the search for extraterrestrial intelligence. The author explores the science behind that search, its history, and the many questions associated with it, including those regarding the nature of language and the philosophical/psychological motivation behind this search.
eBook
Deciding Technosignature Search Strategies: Multi-Criteria Fuzzy Logic to Find Extraterrestrial Intelligence
This study presents the implementation of Multi-Criteria Decision-Making (MCDM) methodologies, particularly the fuzzy technique for order of preference by similarity to ideal solution (TOPSIS), in prioritizing technosignatures (TSs) for the search for extraterrestrial intelligence (SETI). By incorporating expert opinions and weighted criteria based on the established Axes of Merit, our analysis offers insights into the relative importance of various TSs. Notably, radio and optical communications are emphasized, in contrast to dark side illumination and starshades in transit. We introduce a new axis, Scale Sensitivity, designed to assess the variability of TS metrics. A sensitivity analysis confirms the robustness of our approach. Our findings, especially the highlighted significance of artifacts orbiting Earth, the Moon, or the Sun, indicate a need to broaden evaluative criteria within SETI research. This suggests an enhancement of the Axes of Merit, with a focus on addressing the plausibility of TSs. As the quest to resolve the profound question of our solitude in the cosmos continues, SETI efforts would benefit from exploring innovative prioritization methodologies that effectively quantify TS search strategies.
Journal Article
Galactic traversability: a new concept for extragalactic SETI
Interstellar travel in the Milky Way is commonly thought to be a long and dangerous enterprise, but are all galaxies so hazardous? I introduce the concept of galactic traversability to address this question. Stellar populations are one factor in traversability, with higher stellar densities and velocity dispersions aiding rapid spread across a galaxy. The interstellar medium (ISM) is another factor, as gas, dust grains and cosmic rays all pose hazards to starfarers. I review the current understanding of these components in different types of galaxies, and conclude that red quiescent galaxies without star formation have favourable traversability. Compact elliptical galaxies and globular clusters could be ‘super-traversable’, because stars are packed tightly together and there are minimal ISM hazards. Overall, if the ISM is the major hindrance to interstellar travel, galactic traversability increases with cosmic time as gas fractions and star formation decline. Traversability is a consideration in extragalactic surveys for the Search for Extraterrestrial Intelligence (SETI).
Journal Article
البحث عن ذكاء في الفضاء الخارجي : ماضي سيتي وحاضره ومستقبله
يتناول الكتاب منذ بدأ \"سيتي\" البحث عن ذكاء فى الفضاء الخارجي في أبريل 1960، وذلك عندما وحد فرانك دريك قياسات الراديو والطيف في مشروع \"أوزما\"، ليمسح ترددا منفردا يرتبط بحط انبعاث طيفي معروف، واليوم تتضافر المعرفة العلمية الجديدة مع التكنولوجيات البازغة لتقدم وعدا بأننا سنجد إجابة عن تساؤل، ما إذا كنا الحياة الذكية الوحيدة في العالم، وكتاب \"سيتي الماضي والحاضر والمستقبل\" كتبه العلماء والمهندسون أنفسهم الذين قادوا، وما زالوا يقودون البحث العلمي المعروف باسم \"سيتي\". وهو يضم مجموعة من المقالات التي تعرض المشروعات الكبرى الرئيسية التي نفذت في الخمسين سنة الماضية، مع عرض للخلفية التكنولوجية المعاصرة المتعلقة بالأجهزة والتجارب وتقنيات التحليل في \"سيتي\"، ثم يأخذنا إلى المستقبل مع اتجاهات \"سيتي\" المتوقعة خلال الخمسين سنة القادمة.
Book
Searching for extraterrestrial intelligence across a century
SETI, the Search for Extraterrestrial Intelligence, is an old idea but a new science. Both inspirational and controversial, the scientific search for non-human artificial signals or communications, known as technosignatures, was pioneered by a few visionary scientists and through amazing technological advances of recent years is experiencing a renaissance that may soon answer one of the greatest scientific questions of this or any age: Are we alone? This paper describes the origins of SETI science, its rocky road to acceptance and some of the bold new ideas and explorations that are pushing the limits of our understanding of the nature of life and intelligence in the Universe.
Journal Article