The MICROSCOPE satellite, launched by the French space agency on April 25, 2016, has achieved the most accurate test of the principle of weak equivalence: two different masses in free fall fall with the same acceleration of gravity. After 120 orbits around the Earth at 710 km altitude, Einstein’s theory of relativity is confirmed with an accuracy of 10-14, a result ten times more accurate than the best result obtained in a laboratory on the mainland.

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