2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14774Microlensing observations can be used for determining the shape of the Milky Way's halo. It can be shown that the data are best described with moderately flattened halo, 0.5 < q < 0.6. We discuss, by taking into account this result, the constraints on the baryonic mass-density parameter, $Ω_B$, and their implications on the value of the Hubble constant $H_0$, i.e. $h$. Our conclusion is that current data, in order to satisfy BBNS and Galaxy dynamics constraints, strongly suggest that $h$ should take values within the lower part of the permissible range, $h\sim 0.5$.2 pages, 1 figure, uses PASP conference proceedings style, poster contribution to "Gravitational Lensing: Recent Progress and Future Goals", Boston University, July 1999, eds. T.G. Brainerd and C.S. KochanekAstrophysicstext