Main Question or Discussion Point
Hi again. I just re-read the paper from 1920 where Einstein ponders "ether". Based on General Relativity he seemed to conclude that there must be something in space besides nothing. It does not have mechanical properties as the old "aether" was assigned before Relativity, but it must be capable of transporting electromagnetic energy/waves (light, etc). Has there been any advance in the thinking about or modeling of the substance of space since then?