I would like to put a casimir device in orbit around the Earth, with the plates first oriented so that the gap points at the Earth and get readings for a few orbits, and then repeat with the gap perpendicular to that radial direction, to see if the quantum vacuum can be polarized by the presence of matter (Earth, Moon, Sun).

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The ether of general relativity therefore differs from that of classical mechanics or the special theory of relativity respectively, in so far as it is not 'absolute', but is determined in its locally variable properties by ponderable matter.

Albert Einstein, "On the Ether", 1924