This is what scientists in Newton's time thought about. They believed that since a medium is necessary to 'carry' anything, what is space made out of, so it carries light?
This mechanistic principle existed up until the end of the 19th century, until some observations showed up, that couldn't be explained by it.
The mechanical view, however, has to be abandoned in the light of overwhelming evidence that light propagates 'all by itself' - Einstein realised that no medium is necessary; that the empty vacuum is the medium.
It's hard to get the hang of because we always consider 'contents', and so 'containers'; a container made out of nothing is a bit of a stretch, but that's what empty space is. So our logic struggles with how 'nothing' can carry something.
But the math and its logic (Einstein's theories, and Maxwell's) absolutely imply this - light propagates as itself, it's a carrier and the thing that gets carried.
Space is empty except for all the waves in it, some of which have a mass - mass is another kind of wave though. Every particle with mass has a wavelength. Mass is the 'medium' for matter-waves, the electromagnetic fields of massive particles with charge, is the medium for light waves.
Einstein believed a photon had to be a particle because it emitted electrons in the photoelectric effect experiment.
A burst traveling through the medium of space will emit electrons off of the metallic surface.
A molecule creating a wave in the medium of space is a much simpler explanation for the observed behaviors in the DSE.
A photon as a burst traveling through the medium of space is a much simpler explanation for the observed behaviors in both the photoelectric effect experiment and the DSE.
Why doesn't Occam's razor apply to Einstein?
And why does your interpretation of Einstein's theory lead you to believe Einstein thought space was a void?
Einstein quotes:
"More careful reflection teaches us, however, that the special theory of relativity does not compel us to deny ether." and "To deny the ether is ultimately to assume that empty space has no physical qualities whatever".
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