Einstein admitted publicly that "the ether" was not incompatible with General Relativity towards the end of his career https://t.co/ky5E71xtcB [Quoted] Einstein tried to bring back the aether! Most people think Michelson-Morley (1887) ended the debate but i only ruled out a static luminiferous aether, not all models. In his 1920 Leiden lecture, Einstein argued that general relativity requires space itself to have physical https://t.co/sl7zwbWqap