Stellar Metallicity Is A Key Parameter For The Search Of Life In The Universe

By Keith Cowing
July 10, 2022
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Stellar Metallicity Is A Key Parameter For The Search Of Life In The Universe
Periodic table of elements and their nucleosynthesis. Biological utilisation of the elements and biometals (in orange and yellow) and their nucleosynthesis processes in the Universe. CHNOPS elements and elements used as electron donors/acceptors by biology are also reported. Iron and Manganese are the only biometals that not only serve as cofactors, but might be used as metabolic substrates for redox reactions.

The search for Life in the Universe generally assumes three basic life’s needs: I) building block elements (i.e., CHNOPS), II) a solvent to life’s reactions (generally, liquid water) and III) a thermodynamic disequilibrium.

It is assumed that similar requirements might be universal in the Cosmos. On our planet, life is able to harvest energy from a wide array of thermodynamic disequilibria, generally in the form of redox disequilibrium. The amount of different redox couples used by living systems has been estimated to be in the range of several thousands of reactions. Each of these reactions has a specific midpoint redox potential accessible thanks to specialised proteins called oxidoreductases, that constitute life’s engines. These proteins have one or more metal cofactors acting as catalytic centres to exchange electrons.

These metals are de facto the key component of the engines that life uses to tap into the thermodynamic disequilibria needed to fuel metabolism. The availability of these transition metals is not uniform in the Universe, and it is a function of the distribution (in time and space) of the supernovae explosions and complex galaxy dynamics. Despite this, Life’s need for specific metals to access thermodynamic disequilibria has been so far completely overlooked in identifying astrobiological targets.

We argue that the availability of at least some transition elements appears to be an essential feature of habitability, and should be considered a primary requisite in selecting exoplanetary targets in the search for life.

Giovanni Covone, Donato Giovannelli

Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Astrophysics of Galaxies (astro-ph.GA); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2207.03748 [astro-ph.EP] (or arXiv:2207.03748v1 [astro-ph.EP] for this version)
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Submission history
From: Donato Giovannelli
[v1] Fri, 8 Jul 2022 08:32:26 UTC (992 KB)
Astrobiology, Astrochemistry,

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻