  The Milky Way satellite dwarf spheroidal (dSph) galaxies are the smallest
dark matter dominated systems in the universe. We have underway dynamical
studies of the dSph to quantify the shortest scale lengths on which Dark Matter
is distributed, the range of Dark Matter central densities, and the density
profile(s) of DM on small scales. Current results suggest some surprises: the
central DM density profile is typically cored, not cusped, with scale sizes
never less than a few hundred pc; the central densities are typically 10-20
GeV/cc; no galaxy is found with a dark mass halo less massive than ~5.10^7
M_sun. We are discovering many more dSphs, which we are analysing to test the
generality of these results.
