Biology
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.496..379m&link_type=abstract
In: Exo-/astro-biology. Proceedings of the First European Workshop, 21 - 23 May 2001, ESRIN, Frascati, Italy. Eds.: P. Ehrenfreu
Biology
1
Extraterrestrial Intelligence
Scientific paper
In avaluating the number of technological civilizations according to the famous Drake Equation we are matched with the problem of its sixth and seventh terms (fc and L), about which natural sciences can say nothing. Anyway, the need to find suitable energy sources put some constraints on the rise and development of such civilizations. Maybe the strongest one is that intelligent life must evolve on dry land. As Peter D. Ward and Donald Brownlee have recently shown, indeed, this is not so simple, because the only known system to build up dry land is plate tectonics, which need many and very fine-tuned factors to work. Furthermore, life on dry land is more dangerous than submarine one. So, even if intelligent life were common in the universe (e.g. into the oceans), technological life may not. But, on the other side, this would mean that SETI could be directed only towards a very little number of very peculiar stars.
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