- Anonymous1 decade agoFavorite Answer
anything in the world has its mass, even as slight as a molecule has its own mass. In theory and assumption, mass=0 is possible but that limits to papers and math, in physical world this can hardly happen or else it defies physics. Because physics assume mass is greater than 0, if the subject is 0 then most equation cant be applied hence making unsound statement.
For your question of black hole, it cant be 0, yet it cant be measured by the technology nowadays since it sucks everything including light into it. So there is nobody can answer such question, however, with such energy that can suck in even light, it is safe to assume black hole's mass is >0.Source(s): Newtonian Physics