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Habitability: a process versus a state variable framework with observational tests and theoretical implications

Published online by Cambridge University Press:  21 January 2021

A. Lenardic
Affiliation:
Department of Earth Science, Rice University, Houston, TX 77251-1892, USA
J. Seales
Affiliation:
Department of Earth Science, Rice University, Houston, TX 77251-1892, USA
Corresponding
E-mail address:

Abstract

The term habitable is used to describe planets that can harbour life. Debate exists as to specific conditions that allow for habitability but the use of the term as a planetary variable has become ubiquitous. This paper poses a meta-level question: What type of variable is habitability? Is it akin to temperature, in that it is something that characterizes a planet, or is something that flows through a planet, akin to heat? That is, is habitability a state or a process variable? Forth coming observations can be used to discriminate between these end-member hypotheses. Each has different implications for the factors that lead to differences between planets (e.g. the differences between Earth and Venus). Observational tests can proceed independent of any new modelling of planetary habitability. However, the viability of habitability as a process can influence future modelling. We discuss a specific modelling framework based on anticipating observations that can discriminate between different views of habitability.

Type
Research Article
Copyright
Copyright © The Author(s) 2021. Published by Cambridge University Press

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