Mathematics – Logic
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...25..360o&link_type=abstract
Icarus, vol. 25, June 1975, p. 360-367.
Mathematics
Logic
5
Biological Evolution, Extraterrestrial Life, Interstellar Communication, Milky Way Galaxy, Astronomical Models, Extrasolar Planets, Main Sequence Stars, Mathematical Models, Probability Theory, Proximity
Scientific paper
Approximate expressions are derived for the number of civilizations within a few tens of light years of each other since intelligent life first evolved in the galaxy. The number is proportional to the square of the usual selectivity factors and to the first power of the longevity. Arguments are presented for expecting intelligent life in certain multiple star systems, and the number of coexistent civilizations in such systems is estimated.
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