Planetary habitability: estimating the number of Gaias in the Milky Way

Details Planetary habitability: estimating the number of Gaias in the Milky Way Planetary habitability: estimating the number of Gaias in the Milky Way

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.496...73f&link_type=abstract

In: Exo-/astro-biology. Proceedings of the First European Workshop, 21 - 23 May 2001, ESRIN, Frascati, Italy. Eds.: P. Ehrenfreu

Biology

Habitable Zone, Gaia: Drake Equation

Scientific paper

Recently, enormous progress in astronomical measurement techniques has confirmed the existence of extra-solar planets and stimulated the ongoing debate about other civilizations outside the solar system. The Drake equation identifying the relevant factors for a statistical estimation can provide further information about the magnitude of possible extraterrestrial civilizations. Although several factors are highly speculative, a subset of them describing the selection of contemporary biospheres interacting with their environment on a global scale (Gaias) can be stated more precisely. In this paper, the effect of geodynamics on the habitability of planetary systems is investigated. It is found that the number of contemporary sisters of Gaia is twofold higher than as calculated with respect to geostatic models. Our estimation for the number of Gaias gives 2.4 millions.

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