I had this thought today; If I have a cup of pure water I know that it is composed of hydrogen and oxygen atoms. But there is also the empty space between the individual molecules and between the individual atoms and between the atomic particles. This empty space must be no different to the vacuum between the sun and earth in its basic composition and behaviour (if it can be said to possess properties at all), although the 'state' of the vacuum may well be different at the different scales. If I now pour the water into another cup, will I also pour the vacuum between the molecules, atoms, particles etc., or will it stay behind in the empty cup? Will the 'aether' drift?