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Niche amplitude, tidal-locking and Fermi's Paradox

Published online by Cambridge University Press:  12 July 2018

David S. Stevenson
David S. Stevenson*
Affiliation:
Department of Science, Carlton le Willows Academy, Wood Lane, Nottingham NG4 4AA, UK
*
Author for correspondence: David Sinclair Stevenson, E-mail: [email protected]
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Abstract

‘Where is everybody?’ remarked Enrico Fermi, leading to the famous, and as yet unanswered ‘Fermi's Paradox’ as this remark has come to be known. While there are a number of possible solutions that vary from the distances are too great; the cost prohibitive or civilizations naturally decline or eliminate themselves before interstellar travel becomes possible, none of these are intellectually satisfying. More recently, Manasvi Lingam and Abraham Loeb suggested that for those planets orbiting red dwarfs, atmospheric erosion may be a partial solution to this ‘paradox’. Such planets may experience greater exposure to stellar winds and/or extreme ultraviolet and X-radiation (henceforth abbreviated to EUV). While this proposition is undeniably reasonable, it is likely incomplete. A more fundamental limitation on the development of biological complexity is imposed by plate tectonics: time. On asynchronously rotating planets, the habitable area for any species is defined by latitudinal bands that encompass the globe. Conversely, on synchronous rotators, the comparative habitable area is limited to broadly concentric regions surrounding the Sub-Stellar Point (SSP). Given that terrestrial mammals and from them humans evolved in tropical or subtropical regions, the geographical area subtended with these conditions is likely to be smaller and transected by suitable landmasses for shorter periods than on asynchronously rotating worlds. Habitable subaerial regions for individual species are therefore more limited in area. This leads to a greater limitation on the temporal intervals over which biological complexity can evolve.

Keywords

ClimateevolutionFermi Paradoxhabitablenicheplate tectonicsselectionsynchronous rotationtidal locking
Type
Research Article
Information
International Journal of Astrobiology , Volume 18 , Issue 4 , August 2019 , pp. 377 - 383
Copyright
Copyright © Cambridge University Press 2018 

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