A conservative estimate of the number of habitable planets in the Galaxy

Details A conservative estimate of the number of habitable planets in the Galaxy A conservative estimate of the number of habitable planets in the Galaxy

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jbis...31..411b&link_type=abstract

(British Interplanetary Society, Conference on Interstellar Travel and Communication, London, England, Apr. 4, 5, 1977.) British

Mathematics

Probability

Extrasolar Planets, Extraterrestrial Life, Milky Way Galaxy, Mathematical Models, Probability Theory

Scientific paper

An estimate is made of the number of habitable planets in the Galaxy, based upon conservative grounds. That is, the number of stars in the disk of the Galaxy that are similar to the sun, and the probability that these stars have a planet in orbit about them with properties similar to the earth, are estimated. The restrictions applied give values of 10 million habitable planets in the Galaxy (mean separation about 110 light years) and 4-1/2 million planets orbiting stars of sufficient age for intelligent life to have formed (mean separation about 140 light years).

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