Results 11 to 20 of about 11,825 (205)

Dyson spheres [PDF]

open access: yesSerbian Astronomical Journal, 2020
I review the origins and development of the idea of Dyson spheres, their purpose, their engineering, and their detectability. I explicate the ways in which the popular imagining of them as monolithic objects would make them dynamically unstable ...
Wright Jason T.
doaj   +1 more source

The Abundance of Belatedly Habitable Planets and Ambiguities in Definitions of the Continuously Habitable Zone

open access: yesThe Astrophysical Journal, 2023
A planet’s history dictates its current potential to host habitable conditions and life. The concept of the continuously habitable zone (CHZ) has been used to define the region around a star most likely to host planets with long-term habitability ...
Noah W. Tuchow, Jason T. Wright
doaj   +1 more source

The search for extraterrestrial intelligence—SETI [PDF]

open access: yesActa Astronautica, 1979
Abstract This article is taken from a NASA Special Publication, SP-419, released in March 1978. The publication deals with most of the current major topics in the field of the Search for Extraterrestrial Intelligence (SETI), and, as described in the Preface, was the result of a two year series of Science Workshops carried out for NASA by a team of ...
PHILIP MORRISON   +2 more
openaire   +1 more source

Multibeam Blind Search of Targeted SETI Observations toward 33 Exoplanet Systems with FAST

open access: yesThe Astronomical Journal, 2023
The search for extraterrestrial intelligence (SETI) is to search for technosignatures associated with extraterrestrial life, such as engineered radio signals.
Xiao-Hang Luan   +10 more
doaj   +1 more source

Biosemiotic knowledge — a prerequisite for valid explorations of extraterrestrial intelligent life

open access: yesSign Systems Studies, 2002
The scientific search for extraterrestrial intelligent life is probably one of the most ambitious projects ever taken in biology. The article discusses methodological problems associated with the search.
Elling Ulvestad
doaj   +1 more source

¿Cómo enviar mensajes a extraterrestres?

open access: yesChasqui, 2015
Durante más de treinta años, los humanos han utilizado la tecnología de radio para buscar evidencia de inteligencia extraterrestre -ETI-. Colectivamente, estos esfuerzos se conocen como SETI.
Comité Seti
doaj   +1 more source

The Most Sensitive SETI Observations Toward Barnard's Star with FAST

open access: yesThe Astronomical Journal, 2023
Search for extraterrestrial intelligence (SETI) has been mainly focused on nearby stars and their planets in recent years. Barnard’s star is the second closest star system to the Sun and the closest star in the Five-hundred-meter Aperture Spherical radio
Zhen-Zhao Tao   +6 more
doaj   +1 more source

Genoegsame voorwaardes vir buite-aardse rasionaliteit: Filosofiese en teologiese oorwegings

open access: yesHTS Teologiese Studies/Theological Studies, 1996
Sufficient conditions for extraterrestrial intelligence:  Philosophical and theological considerations. Sufficient conditions would include confirmation of extraterrestrial intelligence.
A. J. Antonites
doaj   +1 more source

Is the "Star trek" concept of aliens really naive?: A comment on Duric and Field [PDF]

open access: yesSerbian Astronomical Journal, 2004
Several assumptions used in the recent review paper on the search for extraterrestrial intelligence (SETI) by Duric and Field (2003) are critically discussed.
Ćirković Milan M.
doaj   +1 more source

A note on the Vukotić-Gordon mini-earths [PDF]

open access: yesSerbian Astronomical Journal, 2023
A recent proposal for a new kind of astroengineering artifact due to Vukotić and Gordon (2022) is discussed, in particular in light of multiple benefits offered by the magnetic Penrose process.
Ćirković Milan M.
doaj   +1 more source

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