High-precision space tests of the equivalence principle coming to reality


On 25 April 2016 the French space agency CNES has launched the Microscope satellite to test to 10^-15 (100-fold improvement) whether two test cylinders of different composition are equally accelerated from Earth. Evidence of a violation would signal that either GR needs fixing, or a new force of nature has been found. Either way, it would be a scientific revolution and need confirmation. Read more...


GG: space test of the universality of free fall and the weak equivalence principle to 10^-17

Last edited, April 2016