2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11625Recent HST/GHRS observations of the z = 0.7010 absorber toward the QSO 1718+4807 (selected because of apparently ideal characteristics for measuring D/H) yield a D/H significantly higher D/H than some recent high-redshift measurements. Our analysis indicates D/H}= 1.8 - 2.5 x 10^{-4}. This may indicate a cosmological inhomogeneity in the deuterium abundance of at least a factor of ten.Latex/conf_iap.sty/10pt.sty, 6 pages, 2 figs. To appear in Proc. of the 13th IAP Colloquium: Structure and Evolution of the IGM from QSO Absorption Line Systems, eds. P. Petitjean & S. Charlot, Nouvelles Frontieres, ParisAstrophysicstext