  It is shown that space curvature can be disposed of by properly taking into
account gravitational self energies. This leads to a parameter free
modification of Newton's law, violating Gauss theorem, which accounts for the
crucial tests of gravitation in a flat space. Strong gravitational fields
entail opposing big gravitational self energies. The negative gravitational
self energy of a gravitational composite object, which results in a mass defect
with respect to the sum of the constituents, thus cancels out the latter at the
Schwarzschild radius. Hence a black hole, possible end result of the radiative
shrinkage of a star, having zero total energy cannot any longer interact with
other objects. Baryon number non conservation may result .
