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According to the Weak Equivalence Principle, all bodies should fall at thesame rate in a gravitational field. The MICROSCOPE satellite, launched in April2016, aims to test its validity at the $10^{-15}$ precision level, by measuringthe force required to maintain two test masses (of titanium and platinumalloys) exactly in the same orbit. A non-vanishing result would correspond to aviolation of the Equivalence Principle, or to the discovery of a new long-rangeforce. Analysis of the first data gives $\delta\rm{(Ti,Pt)}= [-1 \pm 9(\mathrm{stat}) \pm 9 (\mathrm{syst})] \times 10^{-15}$ (1$\sigma$ statisticaluncertainty) for the titanium-platinum E\"otv\"os parameter characterizing therelative difference in their free-fall accelerations.

The MICROSCOPE mission: first results of a space test of the Equivalence Principle