[Spirochete]

[“On Earth, life uses left-handed amino acids and right-handed sugars. Since it’s possible that the opposite would work fine–right-handed amino acids and left-handed sugars. Scientists want to know where this preference came from,” the report explained.”]

I’ve wondered that for years.

The best explanation for chirality that I have found is that the galaxy's magnetic field causes sunlight / starlight to be circularly polarized in one direction only, which preferentially degrades D-amino acids and favors L-amino acids.

Also, the weak nuclear force is (supposedly) chiral. The electrons emitted during beta decay favor one spin state; again making D-amino acids slightly more unstable than the L forms.

[Huskrrrr]

Thank you, that makes sense since enantiomers differ only in the direction of rotation of plane polarized light.