There is space. Vacuum space does not containing atoms, true, but there's more to the universe than atoms. Space is probably everywhere in this universe, including here on Earth where there is no vacuum. The fact that you are in it and can travel through it already proofs that it ain't nothing. It is there, but what is it exactly?
Space contains all we know, and most likely more.
In vacuum space (a space without atoms) can be present a:
- Electromagnetic wave/particle
- Gravitational force field
- Magnetical force field
And more.
A wave needs a medium. But a wave isn't a thing that exist. Most things that we recognize in our image of reality, don't exist in the reality it self, not like one would expect at first sight. A sound wave in air is just the air atoms transferring motion. Without air (or such atomic medium) there is no "sound".
So, how about all the electromagnetic waves that travel through space? If they really are pure waves, then there must be a medium. And if there is a speed limit for electromagnetic waves (being the speed of light), the the structure of space must be kind of fixed. See; speed is a relative thing, always "compared to", thus the speed of light is relative to the fixed space it is traveling through. People have named this content of space "Luminiferous Aether".
Given that the earth orbits around the sun at some 100km/hour and turns around its axis, one would expect to detect the flow of “aether wind”. But precise experiments where not able to measure any flow at all. (By Albert Michelson and Edward Morley in 1887, using an interferometer. And in 1903, Frederick Trouton and H.R. Noble took a slightly different approach, but they produced the same result)
So what is going on?
Light in vacuum isn't like sound in air. A wave needs a medium, and light is a medium itself. Light is vibrating between its electric and magnetic force fields, and the speed of light is relative to itself.
But are the electromagnetic force fields part of the light, or is the motion-energy causing these to appear in space, just like how a large mass causes gravity in space? A collapsing magnetic force field releases its energy, transforming it into the next shape of being.
If it's like that, then are these electro magnetic and gravity force fields rising out of nothing, or is it the energy just altering the condition of space?
So; space could be really dense stuff under extremely high pressure. Not a fluid but not absolutely fixed either. Elastic, kind of like springs.. ah; "spring theory"!
This would explain why the universe -including my nose- is expanding (they say it is)