Origins of Chiral Life in Interstellar Molecular Clouds

Valković, Vlado; Obhođaš, Jasmina (2022) Origins of Chiral Life in Interstellar Molecular Clouds. The Astronomical Journal, 163 (6). p. 270. ISSN 0004-6256

PDF - Published Version - article Available under License Creative Commons Attribution. Download (943kB)

Abstract

The exploring of galactic chemical composition across the the Milky Way, and specifically across the solar neighborhood, provides insights into the chemical evolution of the universe. Since the formation of the first stars some hundred million years after the big bang (BB), heavier elements are synthesized in different stellar production processes at the expense of lighter elements. When the relative abundances of the life-forming elements evaluated for the Last Universal Common Ancestor (LUCA) are compared with the solar neighborhood stellar abundances, a striking similarity occurs. In this study, we tested the hypothesis that in some particular regions and at some particular time, the abundance curve of the first living matter and the universe coincided. Indeed, the best agreement between the two curves was obtained for (4 ± 1)× 109 yr after the BB, indicating the time of the origin of life. All organisms evolved on the Earth independently of place and time are leading to the LUCA and involve chiral molecules such as L amino acids and D sugars in fundamental life processes. The growing evidence from carbonaceous meteorites analysis shows an excess of L-type amino acids and D-type sugars, suggesting that the increase in L-type or D-type molecular chirality is the process that takes place in planetary and stellar forming systems, thus the life emerging from interstellar molecular clouds (IMCs) had to be chiral. Here we propose the spin-polarized proton–proton scattering as a potential physical process that takes place in IMCs environments and could lead to enrichment of L-type amino acids and D-type sugars.

Item Type:	Article
Uncontrolled Keywords:	chirality; interstellar molecular clouds; interstellar medium
Subjects:	NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions:	Division of Experimental Physics
Depositing User:	Lorena Palameta
Date Deposited:	14 Dec 2023 12:34
URI:	http://fulir.irb.hr/id/eprint/8308
DOI:	10.3847/1538-3881/ac63d0

Actions (login required)

View Item