Quantitative Habitability
Abstract
A framework is proposed for a quantitative approach to studying habitability. Considerations of environmental supply and organismal demand of energy lead to the conclusions that power units are most appropriate and that the units for habitability become watts per organism. Extreme and plush environments are revealed to be on a habitability continuum, and extreme environments can be quantified as those where power supply only barely exceeds demand. Strategies for laboratory and field experiments are outlined that would quantify power supplies, power demands, and habitability. An example involving a comparison of various metabolisms pursued by halophiles is shown to be well on the way to a quantitative habitability analysis.
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Many environmental effects on maintenance energy are not well constrained, and maintenance energy is still empirically derived.
“Energy demand, on the other hand, is slightly more complex, as many environmental effects on ME are not well constrained. This lack of knowledge presents limitations for developing accurate quantitative models; thus ME is still empirically derived (Shock and Holland, 2007; Smith and Shock, 2007).”
From The Astrobiology Primer v2.0 (2016) · cites this paper as Shock and Holland, 2007
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- Authors
- Shock, E. L., & Holland, M. E.
- Affiliations
- Arizona State University (US)
- Geotek (United Kingdom) (GB)
- Venue
- Astrobiology
- Publisher
- SAGE Publications
- Published
- 2007-12
- Volume
- 7
- Issue
- 6
- Pages
- 839-851
- ISSN
- 1531-1074 (ISSN-L)
- 1557-8070
- OpenAlex
- W4245319209
- Semantic Scholar
- ab8b67b0e804aa6a33634809fe6fbbb76188d6cd
- Cited by
- 63
- References
- 31
- Citations by year
- 2026: 5 · 2025: 4 · 2024: 3 · 2023: 8 · 2022: 5 · 2021: 5 · 2020: 2 · 2019: 3 · 2018: 7 · 2017: 2 · 2016: 4 · 2015: 1 · 2013: 4 · 2012: 5
- FWCI
- 1.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Astrobiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Space Science and Extraterrestrial Life
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
- Keywords
- habitability, power units, energy supply, energy demand, extreme environments, power supply and demand balance, halophiles, metabolism
- MeSH terms
- Animals, Ecology, Environment, Biological Evolution, Humans, Electric Power Supplies, Ecosystem, Exobiology
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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