A satellite experiment testing the universality of free fall. Electrostatic control keeps test masses made from titanium and platinum alloys on matched orbital motion; the required differential forces constrain composition dependence. A reference sensor uses masses of the same composition. The experiment tests the weak equivalence principle, rather than the full strong equivalence principle.[ref]
The MICROSCOPE mission: first results of a space test of the Equivalence Principle by Pierre Touboul and others. 2017 paper: differential electrostatic measurement and reference instrument
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