470
Antimatter falls down, not up: CERN experiment confirms theory
(www.nature.com)
Subscribe to see new publications and popular science coverage of current research on your homepage
Well yeah. The concensus at the time was that light is a wave, and waves need a medium to travel through, so they just made up some stuff that must be everywhere and called it the aether. The null result of the interferometer experiment is part of what led to the discovery that light is a particle that acts like a wave, and so doesn't need a medium.
The medium for the electromagnetic field is space time