  We study the distribution of dark matter versus visible matter using a set of
data obtained from strong gravitational lensing in the galaxy cluster
CL0024+1654 and another set of data inferred from the universal rotation curves
in spiral galaxies. The important feature of these two dramatically different
observations is that the mass density profile of both visible and dark
components can be estimated. From these measurements we deduce the mass of the
dark matter particle and our estimate of the mass for the dark matter particle
is $\mu_d \approx (200-800)$MeV. We contrast our estimates from CL0024+1654
data and the universal rotation curves of the spiral galaxies and discuss their
consistency.
