  Experimental tests of Newton law put stringent constraints on potential
deviations from standard theory with ranges from the millimeter to the size of
planetary orbits. Windows however remain open for short range deviations, below
the millimeter, as well as long range ones, of the order of or larger than the
size of the solar system. We discuss here the relation between long range tests
of the Newton law and the anomaly recorded on Pioneer 10/11 probes.
