2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178250Spiral galaxies are axi-symmetric objects showing 2D-chirality when projected onto a plane. Features in common with tetrahedral molecules are pointed out, in particular the existence of a preferred chiral modality for genetic galaxies as in aminoacids and sugars. Environmental effects can influence the intrinsic chirality of originally isolated stellar systems so that a progressive loss of chirality is recognised in the Hubble morphological sequence of galaxies.17 pages, 4 figuresChemical PhysicsAstrophysicsSpace Physicstext