  The problem of the enormous gravitational effects observed by the astronomers
in several galactic nuclei with obscure bodies appears puzzling. These bodies
are too large to be neutron stars generated by supernovae of primeval stars and
are too small to be considered a new kind of obscure galaxies. This
contradiction represents a fundamental test which might destroy the established
gravitational theories. We present a new physical paradigm which substitutes
the old "gravitational mass" guessed by Newton more than tree centuries ago.
