  The possibility is explored that neutrino condensates, possible candidates
for the explanation of very massive objects in galactic centers, could act as
background for the Mikheyev-Smirnov-Wolfeinstein mechanism responsible of
neutrino oscillations. Assuming a simple neutrino star model with constant
density, the lower limit of the mass squared difference of neutrino
oscillations is inferred. Consequences on neutrino asymmetry are discussed.
