Searching for extraterrestrial civilizations

Details Searching for extraterrestrial civilizations Searching for extraterrestrial civilizations

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sci...196..616k&link_type=abstract

Science, vol. 196, May 6, 1977, p. 616-621.

Astronomy and Astrophysics

Astronomy

3

Extraterrestrial Life, Interstellar Travel, Space Colonies, Galactic Evolution, Intelligence, Milky Way Galaxy, Radio Astronomy, Research Projects, Signal Detectors

Scientific paper

Three interrelated assumptions are critically examined in an attempt to outline a productive strategy for a search for extraterrestrial intelligence. Questions concerning the feasibility of interstellar travel are investigated. It is concluded that the probability of interstellar travel is high enough that, given a modest number of advanced civilizations, at least one of them will engage in interstellar voyages and colonize the galaxy. Assuming, however, that technological civilizations are rare the galaxy would be essentially unpopulated. Attention is given to the present lack of contact with extraterrestrial beings and frequencies for interstellar beacons.

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