Physics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jbis...34..486s&link_type=abstract
British Interplanetary Society, Journal (Interstellar Studies), vol. 34, Nov. 1981, p. 486-490.
Physics
Classifications, Culture (Social Sciences), Energy Sources, Extraterrestrial Intelligence, Interstellar Communication, Energy Consumption, Technology Assessment
Scientific paper
A novel classification of the forms that an extraterrestrial culture might take is made, the classification being based on well-established physical principles as an aid in the search for extraterrestrial intelligences. The most popular current classification (Kardeshev, 1964), which has three divisions identified by the energy consumption of the culture, is critically examined. The new classification of the technically developing cultures, based on the energy sources that a culture has harnessed, is described in detail. It is assumed that all intelligent species evolved on or near the surface of planets similar to the earth in that they are part of the inner system of a stable star and possess a hard surface. Areas of activity (e.g., favorable surface conditions, nearby planetary systems, widespread in the Galaxy), energy sources (e.g., unmodified and modified surface sources, fusion of all light isotopes, annihilation of matter), and primary energy sources (e.g., local primary, ancient supernova events, later and early stages of 'Big Bang') are examined for the six classes of civilization. Inferences, that might suggest improved approaches to the current searches for extraterrestrial intelligences, are drawn from the proposed classification.
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