The Search for Extraterrestrial Intelligence, SETIPhilip Morrison, John Billingham, John Wolfe National Aeronautics and Space Administration, Scientific and Technical Information Office, 1977 - 276 páginas |
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Página 5
... technique , only a generation or so old , has now reached such maturity that a signal sent from an existing radio dish on Earth , with sending and receiving devices already at hand , could be detected with ease across the Galaxy by a ...
... technique , only a generation or so old , has now reached such maturity that a signal sent from an existing radio dish on Earth , with sending and receiving devices already at hand , could be detected with ease across the Galaxy by a ...
Página 14
... techniques need to be developed in associa- tion with existing facilities and comprehensive searches made before it becomes evident that a more sensitive system is needed . Great discoveries are often the result more of courage and ...
... techniques need to be developed in associa- tion with existing facilities and comprehensive searches made before it becomes evident that a more sensitive system is needed . Great discoveries are often the result more of courage and ...
Página 21
... of extrasolar planetary systems ( see Section III - 3 ) , the development of techniques for compiling extensive lists of target stars ( see Section III - 4 ) , the study of alternative search strategies , and the continuing study of the 21.
... of extrasolar planetary systems ( see Section III - 3 ) , the development of techniques for compiling extensive lists of target stars ( see Section III - 4 ) , the study of alternative search strategies , and the continuing study of the 21.
Página 22
... techniques could be improved to the point where the existence of near - by planets could be proved or disproved , but the effort might require two or three periods of a major planet , i.e. , two or three decades . Preliminary ...
... techniques could be improved to the point where the existence of near - by planets could be proved or disproved , but the effort might require two or three periods of a major planet , i.e. , two or three decades . Preliminary ...
Página 28
... techniques to be tested . With respect to space borne antennas , it may be desirable , as studies proceed , to fly one or more medium size designs as shuttle payloads . The missions should be designed not only to test the structures but ...
... techniques to be tested . With respect to space borne antennas , it may be desirable , as studies proceed , to fly one or more medium size designs as shuttle payloads . The missions should be designed not only to test the structures but ...
Otras ediciones - Ver todas
The Search for Extraterrestrial Intelligence, SETI Philip Morrison,John Billingham,John Wolfe Vista completa - 1977 |
The Search for Extraterrestrial Intelligence, SETI Philip Morrison,John Billingham,John Wolfe Vista completa - 1977 |
The Search for Extraterrestrial Intelligence, SETI Philip Morrison,John Billingham,John Wolfe Vista completa - 1977 |
Términos y frases comunes
Ames Research Center antenna Arecibo array astrometric bandwidth beam biological capabilities CETI clouds collecting area COMPLEMENTARY DOCUMENT cosmic cost cultural Cyclops density detection direction distance Earth Earth-based electromagnetic emission energy extraterrestrial civilizations extraterrestrial intelligence factors flux level frequency band galactic Galaxy ground-based hydrogen interstellar communication interstellar medium interstellar search Jesse Greenstein Jet Propulsion Laboratory main sequence maser microwave window NASA noise observations Observatory optimum orbit Philip Morrison planetary systems planets polarization possible present problem Project Cyclops pulsars pulse radar radial velocity radiation radio astronomy radio frequency interference radio telescopes range received resolution satellite Science Workshop scientific search for extraterrestrial search for signals search strategy search system Section sensitivity SETI Program Office SETI system signals from extraterrestrial solar system sources space spectral type spectrum star formation stellar studies techniques temperature terrestrial transmitters University W/m² water hole wavelength
Pasajes populares
Página 8 - Some conjecture that we might hear from nearimmortals the views of distant and venerable thinkers on the deepest values of conscious beings and their societies! Perhaps we will forever become linked with a chain of rich cultures, a vast galactic network. Who can say? If it is true that such signals might give us, so to speak, a view of one future for human history, they would take on even greater importance. Judging that importance lies quite outside the competence of the members of this committee,...
Página 177 - L, libration point of the Earth-Moon system, a point at lunar distance but on the opposite side of the Earth from the Moon. Among several desirable features of an orbiting antenna system are the complete sky coverage, the ability to track a given star continuously if a signal is detected, the reduced system temperature, and the potential structural simplicity and longevity made possible by the weightlessness and benign environment. Further studies are needed of the space-based SETI and of the alternatives...
Página 271 - Tyler, director, Center for Advanced Study In the Behavioral Sciences, 202 Junipero Serra Boulevard, Stanford, Calif.
Página 193 - Services; (j) that available technology will allow a search for these signals from the earth, from earth-orbit, and, eventually, from the moon and to minimize interference, certain locations on earth and in space may be preferred; DECIDES that the following question should be studied: 1. what are the most probable characteristics of radio signals which might be broadcast by extraterrestrial civilizations and the technical characteristics and requirements of a system to search for them; 2. what are...
Página 8 - Other imaginative and enthusiastic speculators foresee big technological gains, hints and leads of extraordinary value. They imagine too all sorts of scientific results, ranging from a valid picture of the past and the future of the Universe through theories of the fundamental particles...
Página 30 - US space program has provided not only excitement and scientific knowledge, but numerous practical satellite services not for this country alone, but for the whole world. It is in this same spirit of providing a focal point for international cooperation and support that we feel the US can and should take the initiative in SETI. The material, technological and intellectual resources of the US are such that a large-scale SETI program could be carried on indefinitely by this country alone without appreciable...
Página 192 - Technical criteria for allowable spurious radiation from out-of-band uses, iv) Phase-out of interfering uses now operating in the protected bands. Subsequent to the Science Workshop deliberations and during the preparation of the final report, the SETI radio frequency protection need received its first international recognition.
Página 19 - For these reasons it is premature to adopt only one strategy to the exclusion of others. To cover a wide range of other possibilities it is recommended that in addition to a high sensitivity search of nearby stars, there also be a complete search of the sky to as low a flux level and over as wide a frequency band as practicable.
Página vii - It is precisely because I believe theologically that there is a being called God, and that He is infinite in intelligence, freedom, and power, that I cannot take it upon myself to limit what He might have done.
Página 216 - ... to the character of the signals. Thus the problem of methodically searching for signals from extraterrestrial civilizations will include the following aspects: a) a search for sources of radiation with respect to direction, frequency, and time; b) an analysis of the structural properties of the radiation; c) determination of its artificial nature. Accordingly, this program provides for the following steps in research activity: 1 . Search for and selection of sources according to preliminary criteria....