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`Ether-drift' experiments have played a crucial role for the origin ofrelativity. Though, a recent re-analysis shows that those original measurementswhere light was still propagating in gaseous systems, differently from themodern experiments in vacuum and in solid dielectrics, indicate a smalluniversal anisotropy which is naturally interpreted in terms of a non-localthermal gradient. We argue that this could possibly be the effect, on weaklybound gaseous matter, of the temperature gradient due to the Earth's motionwithin the Cosmic Background Radiation (CBR). Therefore, a check with modernlaser interferometers is needed to reproduce the conditions of those earlymeasurements with today's much greater accuracy. We emphasize that anunambiguous confirmation of our interpretation would have far reachingconsequences. For instance, it would also imply that all physical systems onthe moving Earth are exposed to a tiny energy flow, an effect that, inprinciple, could induce forms of self-organization in matter.

Cosmic Background Radiation and `ether-drift' experiments