Michelson and Morley in the 1890s made an experiment proving, quote: "beyond any doubts" there is no "aether", or that space is empty and does not exist!
And this interpretation is still in force in science as it is mandatory to explain light's absolute speed (from the point of view of science).
Now because material particles where found to pop out this non existing back ground, Quantum Mechanics came up with the anti-matter concept; one anti-material particle plus a material particle in effect amounting to nothing, could in the end pop out of nothing.
To complicate things in the Quantum Field Theory, a quantum field comes now and permeates space-time, contradicting Michelson and Morley revered experiment.
And even more troubling are science's dark energy and dark matter, not mentionning the cosmic microwave background (CMB), which would be related to dark energy.
In gravimotion's interpretation of Nature nothing can occur without occurring under something real, as is the case for space-time in science; any volume, having dimensions other than zero, has to be defined by one or more real entity within its boundaries; otherwise such emptiness is per definition dimensionless and does not occur.
In gravimotion's interpretation of Nature, and as already mentioned, the present mo(ve)ment (for Einstein's space-time) is actually occurring as pure dynamic-motion-volumes abolishing altogether (or merging) both our concepts of time and space.