MICROSCOPE Mission Presents Most Precise Test of General Relativity’s Weak Equivalence Principle

The MICROSCOPE satellite.

Published in 'Physical Review Letters' and a special issue of 'Classical Quantum Gravity' on September 14, the final results from the MICROSCOPE mission measured accelerations of free-falling objects in a satellite orbiting Earth. The team found that the accelerations of pairs of objects differed by no more than about one part in 10^15, ruling out any violations of the Weak Equivalence Principle or deviations from the current understanding of general relativity at that level. (Image via ONERA)