  We report some results from one of the largest hydrodynamical cosmological
simulations of large scale structures that has been done up to date. The
MareNostrum Universe SPH simulation consists of 2 billion particles (2 times
1024^3) in a cubic box of 500 h^-1 Mpc on a side. This simulation has been done
in the MareNostrum parallel supercomputer at the Barcelona SuperComputer
Center. Due to the large simulated volume and good mass resolution, our
simulated catalog of dark matter halos comprises more than half a million
objects with masses larger than a typical Milky Way galaxy halo. From this
dataset we have studied several statistical properties such as the evolution of
the halo mass function, the void distribution, the shapes of dark and gas halos
and the large scale distribution of baryons.
