2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48111We point out that the spectrum and interactions of light states of the heterotic string indicate a string scale close to the GUT scale, and a mass generating scale for the gravitationally interacting states around 10^9 GeV if these states contribute a large fraction to dark matter.7 pages, 1 figure, uses iopconf1.sty, to appear in the proceedings of DARK98, Heidelberg (Germany) 20-24 July 1998High Energy Physics - PhenomenologyAstrophysicstext