  The asymmetry in the cosmic microwave background (CMB) towards several nearby
galaxies detected by Planck data is probably due to the rotation of "cold gas"
clouds present in the galactic halos. In 1995 it had been proposed that
galactic halos are populated by pure molecular hydrogen clouds which are in
equillibrium with the CMB. More recently, it was shown that the equillibrium
could be stable. Nevertheless, the cloud chemical composition is still a matter
to be studied. To investigate this issue we need to trace the evolution of
these virial cloud from the time of their formation to the present, and to
confront the model with the observational data. The present paper is a short
summary of a paper [1]. Here we only concentrate on the evolution of these
clouds from the last scattering surface (LSS) up to the formation of first
generation of stars (population-III stars).
