The number of inhabited planets in the Galaxy

Details The number of inhabited planets in the Galaxy The number of inhabited planets in the Galaxy

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jbis...37..410t&link_type=abstract

British Interplanetary Society, Journal (Interstellar Studies) (ISSN 0007-084X), vol. 37, Sept. 1984, p. 410-413.

Biology

Extrasolar Planets, Extraterrestrial Life, Milky Way Galaxy, Planetology, Exobiology, Planetary Atmospheres, Planetary Evolution, Planetary Temperature

Scientific paper

Planets that at present host life number about 10 million in the Galaxy of 100 billion stars, according to the theoretical calculation presented here. The argument is based on five premises: (1) Planets that have mean surface temperatures in the range of 273 to 280 K at birth do not undergo runaway greenhouse heating nor runaway glaciation in the course of their evolution. (2) These planets do not retain their primordial hydrogenic atmospheres. (3) Any such planet found around a late-F or Population-I G or early-K star residing in a spiral arm is almost certain to be capable of harboring biological activity. (4) Nearly every star possesses planets, the orbital radii of which follow a geometrical progression with 1.73 being the common ratio. (5) In an ensemble of solar systems around stars of a given spectral class, planets are uniformly distributed over the orbital radius zone that corresponds to the 273-280 K temperature range.

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