  Satellite laser-ranging is successfully used in space geodesy, geodynamics
and Earth sciences; and to test fundamental physics and specific features of
General Relativity. We present a confirmation to approximately one part in a
billion of the fundamental weak equivalence principle (uniqueness of free fall)
in the Earth's gravitational field, obtained with three laser-ranged
satellites, at previously untested range and with previously untested
materials. The weak equivalence principle is at the foundation of General
Relativity and of most gravitational theories.
