  Recent observations of the space distribution of quasars indicate a very
notable peak in space density at a redshift of $2$ to $3$.It is pointed out in
this article that this may be the result of a phase transition which has a
critical temperature of roughly a few meV (in the cosmological units h=c=k=1 ).
It is further pointed out that such a phase transition is natural in the
context of massive neutrinos. In fact,the neutrino masses required for quasar
production and those required to solve the solar neutrino problem by the MSW
mechanism are consistent with each other.
