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Astrobiology: resolution of the statistical Drake equation by Maccone's lognormal method in 50 steps

Published online by Cambridge University Press:  14 June 2023

E. Mieli*
Affiliation:
Via Oceano Pacifico, 2/A – 00071 Pomezia (Rome), Italy
A. M. F. Valli
Affiliation:
Istituto Italiano di Paleontologia Umana, Museo Civico di Zoologia, Via Aldrovandi 18, 00197 Roma (Italia), Société Scientifique du Bourbonnais pour l’Étude et la Protection de la Nature, Moulins-sur-Allier, France
C. Maccone
Affiliation:
Istituto Nazionale di Astrofisica (INAF), Rome, Italy International Academy of Astronautics (IAA), Paris, France
*
Corresponding author: E. Mieli; Email: eugenio.mieli@gmail.com

Abstract

The authors use the mathematical tool of Maccone's lognormal distribution to further factor the Drake equation, which calculates the number of advanced civilizations in the galaxy, from the seven original levels of the Drake equation to 49 levels of overall analysis. The Maccone approach, in fact, supported by the central limit theorem, becomes more reliable the more levels are introduced. The resulting study necessarily draws upon an array of disciplines ranging from astronomy, chemistry and geology to biology, palaeontology and futurology. The final result calculates the number of planetary systems suitable for life in its various stages of development: those which have probably hosted life in the past and those which still host it at its various evolutionary levels. The final evolutionary level is the so-called galactic civilization (often called ETC, or extraterrestrial civilizations). The number of resulting galactic civilizations is divided between static civilizations, which do not move around the galaxy and whose Kardašëv rating is still low (<1.4), of which we find three examples (we ourselves plus, perhaps, two others), and potentially dynamic civilizations, which move around the galaxy and have a sufficiently high Kardašëv rating (≥1.4), of which we find 2000.

Type
Research Article
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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