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Light propagates in "nothing at all", or rather, does not propagate.'nuff said! :-D
Sound has a medium: air.
Light has no medium, and it was a mistake to look for something that could support its propagation.
Light is an instantaneous transaction of energy between two atoms, so we cannot really talk about "propagation" which requires a speed, that is to say a ratio of distance over time.
The question is what gives light an aspect of propagation when there is no propagation? What gives it a wave-like appearance, when there is no wave? What gives it the appearance of a particle when there is no particle.
If you think about it, what the photon seems to be surfing on is not an ether, it is not something metric, it is not something compact.
It is simply universal enisochrony.
In short, the photon does not exist, but seems to exist, and if we had to propose something on which it surfs, it would be spatial anisochornia.
In short, it surfs on time.
By crossing space, it crosses time for the observer who studies it, and thus gives an impression of speed, of surfing on "this time".
But this is only an illusion. Between the two atoms, between here and there, there is nothing at all; not the slightest existence.
When the quantum leaves the atom, it is already instantly at the level of an atom of the receiver.
Niet, ether.
R.H.
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