What I want to say is that the idea of eternal particles moving through an absolute space is wrong, because relativity requires spacetime to be observed and that observation generates space as we know it.
It is a bit like an aether or a perfect fluid. But aether would be wrong, since that is stuff in space. Relativity requires space to be dependent on the observer and on its movement. We could imagine spacetime of GR to be that what we observe. Now that space needs a structure. We know a lot from electrodynamics and relativity. Spacetime is a kind of space, too, with weired features. Mainly it is multiplicative and imaginary.