Light
Light and radio transmissions are waveforms at different frequencies. This is well understood. What is clear though, is that a particle of light cannot exist and travel. If a particle was to be emitted from a distant star, then it would have to travel in all directions at the same time to be seen from opposite sides of the universe, or even at two different positions such as where I stand and where you stand. The amount of matter that would have to move to all parts of the universe simultaneously would be so great as to empty the whole star of matter. Even the transmission of the minutest particles in that way would involve unimaginable amounts of particles to be made and moved every microsecond. Instead, it is clear that the whole of space is filled with micro-particles or "dark matter" (which really ought to be called "light matter"!) The micro-particles are loosely attached to each other and transmit the wave or vibration that we perceive as light. The particles do not move, but the transmission of light and all frequencies of radio waves proves that they are there.
Please note that the transmission of waves shows that the particles are not only in contact but lightly attached to each other. Transmission of vibrations between separate particles, with a gap between them, or which are entirely unattached, is not possible. Just try to get some billiard balls or similar to transmit a pulse or vibration between them. This cannot be done unless they are glued or strung together.
This proves that space is not a vacuum, there is something there with a physical structure, but which transmits what we call light, from a source, but which does not emit vibrations itself, so we cannot see it.
Because the particles are connected together, they are able to transmit light. This means that the whole Universe is an invisible "world", in which the spirit dwells after life ceases in molecular form. Richard Dawkins for one, had better beware of what he says. Life is not here by accident.
Two tides daily prove that the moon acts via an intermediate substance