Particles from Space may have Given Early Biomolecules an Evolutionary Nudge

Well this is fun. @gbrooks9’s cosmic ray theory of God’s guidance might have just gotten some support behind it. Is this vindication?

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This does not actually seem to constitute an explanation for how the homochirality of biological molecules originated, it merely serves to provide some sort of putative selective explanation for why a biosphere with one chirality might have a selective, evolutionary advantage over another. We are still left wondering why these two competing (left-handed vs right-handed) biospheres came to be homochiral in the first place.

Another unconsidered problem, at least in that pop-sci article is, why we get the D-isomers of sugars, and the L-isomers of amino acids.

I think the paper is Globus, N. and Blandford, R.D., 2020. The Chiral Puzzle of Life. The Astrophysical Journal Letters, 895(1), p.L11.

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True, but cosmic rays! Perhaps you haven’t been around long enough to understand the monumental significance this has to @gbrooks9 :slight_smile: .

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Seems to basically confirm the pop-sci article, in that we aren’t provided an explanation for how we end up with a homochiral double helix in the first place, it’s just assumed that a helical polymer somehow emerges from a racemic mixture. And then this selective pressures favors one hirality over the other.