The Process We Call Earth: Relationships Between Dynamic Feedbacks and the Search for Gaiasignatures in a New Paradigm of Earthlikeness DOI Creative Commons
Michael L. Wong,

Marissa Duckett,

Emilia S. Hernandez

et al.

Perspectives of Earth and Space Scientists, Journal Year: 2024, Volume and Issue: 5(1)

Published: March 6, 2024

Abstract Standard notions of an “Earthlike” planet rely solely on physical and material properties, like planetary mass, radius, surface temperature. Here, we introduce a novel, relational perspective what defines “Earthlikeness.” In our process‐based framework, rocky planets are local pockets free energy that have the potential to drive emergence dynamically persistent systems coevolve with one another. Examples phenomena include magnetic dynamos, mantle convection, tectonic regimes, deep volatile cycles, global climate feedbacks, biogeochemical biosphere. When two or more processes couple another such they gain causal efficacy over another's persistence, some degree planetary‐scale homeostasis may emerge. astrobiology, Earthlike exoplanets often considered be priority targets for search life elsewhere. We suggest framework Earthlikeness has widen space inspire novel biosignatures, “Gaiasignatures,” essential detecting exoplanetary biospheres. Additionally, view can influence development agnostic biosignatures at all scales. contrast dominant scientific perspective, which tended engender materialistic worldview, ontologies contribute understanding Earth as network systems, humanity integral part nature, in universe.

Language: Английский

A robust, agnostic molecular biosignature based on machine learning DOI Creative Commons
Henderson James Cleaves, Grethe Hystad, Anirudh Prabhu

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(41)

Published: Sept. 25, 2023

The search for definitive biosignatures—unambiguous markers of past or present life—is a central goal paleobiology and astrobiology. We used pyrolysis–gas chromatography coupled to mass spectrometry analyze chemically disparate samples, including living cells, geologically processed fossil organic material, carbon-rich meteorites, laboratory-synthesized compounds mixtures. Data from each sample were employed as training test subsets machine-learning methods, which resulted in model that can identify the biogenicity both contemporary ancient samples with ~90% accuracy. These methods do not rely on precise compound identification: Rather, relational aspects chromatographic peaks provide needed information, underscores this method’s utility detecting alien biology.

Language: Английский

Citations

16
The Average Symmetry Index of Minerals Co-Varies with Their Hydrogen Content, Rarity, and Paragenetic Mode DOI Open Access
Marko Bermanec, Noa Vidović, Xiaogang Ma

et al.

Minerals, Journal Year: 2024, Volume and Issue: 14(4), P. 387 - 387

Published: April 8, 2024

Variations in the Dolivo-Dobrovol’sky symmetry index for minerals through time reveal several factors that influence emergence of crystalline natural processes. Of special interest this regard are numerous paragenetic modes—different processes mineral genesis reflect changes physical, chemical, and ultimately biological environments foster new species. Here, we consider roles hydrogen content, rarity, formation temperature pressure, age on average from 57 different modes (i.e., modes). We find four significant trends all each mode: specifically, is (1) lower with greater content; (2) formed at higher pressure; (3) rarity; (4) older modes. These findings elucidate some intricate relationships among modes, attributes, index, providing insights into geological governing formation.

Language: Английский

Citations

5
An Overview of Exoplanet Biosignatures DOI
Edward W. Schwieterman, Michaela Leung

Reviews in Mineralogy and Geochemistry, Journal Year: 2024, Volume and Issue: 90(1), P. 465 - 514

Published: July 1, 2024

Language: Английский

Citations

5
An Informational–Entropic Approach to Exoplanet Characterization DOI Creative Commons
Sara Vannah,

Ian D. Stiehl,

Marcelo Gleiser

et al.

Entropy, Journal Year: 2025, Volume and Issue: 27(4), P. 385 - 385

Published: April 4, 2025

In the past, measures of “Earth-likeness” exoplanets have been qualitative, considering an abiotic Earth, or requiring discretionary choices what parameters make a planet Earth-like. With advent high-resolution exoplanet spectroscopy, there is growing need for method quantifying Earth-likeness that addresses these issues while making use data available from modern telescope missions. this work, we introduce informational–entropic metric makes spectrum to directly quantify how Earth-like is. To illustrate our method, generate simulated transmission spectra series and super-Earth exoplanets, as well exoJupiter several gas giant exoplanets. As proof concept, demonstrate ability information evaluate similar it powerful tool in search candidate Earth 2.0.

Language: Английский

Citations

0
A Complex Systems Approach to Exoplanet Atmospheric Chemistry: New Prospects for Ruling Out the Possibility of Alien Life As We Know It DOI Creative Commons
Theresa Fisher, Estelle Janin, Sara Imari Walker

et al.

The Planetary Science Journal, Journal Year: 2025, Volume and Issue: 6(5), P. 116 - 116

Published: May 1, 2025

Abstract The near-term ability to characterize terrestrial exoplanet atmospheres may bring us closer discovering alien life through atmospheric data. However, remotely detectable candidate biosignature gases are subject false-positive signals because they can also be produced abiotically, raising a critical need develop methods determine whether gas is abiotically or not. To distinguish biological, abiotic, and anomalous sources (unidentified as abiotic biotic) of gases, we take complex systems approach implementing chemical reaction network analysis planetary atmospheres. We simulated 30,000 atmospheres, organized in two data sets: Archean-Earth-like worlds modern-Earth-like worlds. For worlds, study cases where CH 4 via serpentinization, biologically methanogenesis, from sources. simulate with without industrial CFC-12. show how properties effectively scenarios methanogenesis serpentinization. Network distinguishes CFC-12 those it. Using Bayesian analysis, demonstrate statistics provide stronger confidence for ruling out biological explanations compared abundance alone. Our results confirm theoretic allows distinguishing hypotheses about drivers and, importantly, know it possible explanation. conclude discussion further developing statistical inference spectral that incorporate could significantly strengthen future detection efforts.

Language: Английский

Citations

0
Direct Analysis of Complex Reaction Mixtures: Formose Reaction DOI Creative Commons
Anamarija Briš, Mathieu G. Baltussen, Guilherme L. Tripodi

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(6)

Published: Dec. 15, 2023

Complex reaction mixtures, like those postulated on early Earth, present an analytical challenge because of the number components, their similarity, and vastly different concentrations. Interpreting networks is typically based simplified or partial data, limiting our insight. We a new approach online monitoring mixtures formed by formose ion-mobility-separation mass-spectrometry. Monitoring led to large data sets that we analyzed non-negative matrix factorization, thereby identifying ion-signal groups capturing time evolution network. The comprised ≈300 major ion signals corresponding sugar-calcium complexes during reaction. Multivariate analysis kinetic profiles these provided overview interconnected processes in solution, highlighting pathways for sugar growth effects initiators initial kinetics. Reconstructing network's topology further, revealed so far unnoticed fast retro-aldol ketoses, which significantly affects dynamics. also detected onset sugar-backbone branching C

Language: Английский

Citations

8
An information theory approach to identifying signs of life on transiting planets DOI Creative Commons
Sara Vannah, Marcelo Gleiser, Lisa Kaltenegger

et al.

Monthly Notices of the Royal Astronomical Society Letters, Journal Year: 2023, Volume and Issue: 528(1), P. L4 - L9

Published: Oct. 17, 2023

ABSTRACT Can information theory provide insights into whether exoplanets are habitable? Here, we apply to a range of simulated exoplanet transmission spectra as diagnostic tool search for potential signatures life on Earth-analogue planets. We test the algorithms three epochs evolution Earth-like planets orbiting host stars. The JWST and upcoming ground- space-based missions promise achieve sufficient high-resolution data that can be applied assess habitability. This approach provides framework observers an shows signs

Language: Английский

Citations

2
Direct Analysis of Complex Reaction Mixtures: Formose Reaction DOI Creative Commons
Anamarija Briš, Mathieu G. Baltussen, Guilherme L. Tripodi

et al.

Angewandte Chemie, Journal Year: 2023, Volume and Issue: 136(6)

Published: Dec. 15, 2023

Abstract Complex reaction mixtures, like those postulated on early Earth, present an analytical challenge because of the number components, their similarity, and vastly different concentrations. Interpreting networks is typically based simplified or partial data, limiting our insight. We a new approach online monitoring mixtures formed by formose ion‐mobility‐separation mass‐spectrometry. Monitoring led to large data sets that we analyzed non‐negative matrix factorization, thereby identifying ion‐signal groups capturing time evolution network. The comprised ≈300 major ion signals corresponding sugar‐calcium complexes during reaction. Multivariate analysis kinetic profiles these provided overview interconnected processes in solution, highlighting pathways for sugar growth effects initiators initial kinetics. Reconstructing network's topology further, revealed so far unnoticed fast retro‐aldol ketoses, which significantly affects dynamics. also detected onset sugar‐backbone branching C 6 sugars cyclization reactions starting 5 sugars. This top‐down opens way analyze complex dynamic with unprecedented coverage resolution.

Language: Английский

Citations

1
The Process We Call Earth: Relationships Between Dynamic Feedbacks and the Search for Gaiasignatures in a New Paradigm of Earthlikeness DOI Creative Commons
Michael L. Wong,

Marissa Duckett,

Emilia S. Hernandez

et al.

Perspectives of Earth and Space Scientists, Journal Year: 2024, Volume and Issue: 5(1)

Published: March 6, 2024

Abstract Standard notions of an “Earthlike” planet rely solely on physical and material properties, like planetary mass, radius, surface temperature. Here, we introduce a novel, relational perspective what defines “Earthlikeness.” In our process‐based framework, rocky planets are local pockets free energy that have the potential to drive emergence dynamically persistent systems coevolve with one another. Examples phenomena include magnetic dynamos, mantle convection, tectonic regimes, deep volatile cycles, global climate feedbacks, biogeochemical biosphere. When two or more processes couple another such they gain causal efficacy over another's persistence, some degree planetary‐scale homeostasis may emerge. astrobiology, Earthlike exoplanets often considered be priority targets for search life elsewhere. We suggest framework Earthlikeness has widen space inspire novel biosignatures, “Gaiasignatures,” essential detecting exoplanetary biospheres. Additionally, view can influence development agnostic biosignatures at all scales. contrast dominant scientific perspective, which tended engender materialistic worldview, ontologies contribute understanding Earth as network systems, humanity integral part nature, in universe.

Language: Английский

Citations

0