That's what they tell us. Light can travel through a vacuum with nothing in it. And maybe so but what is the evidence?
So I looked up the best vacuum on planet Earth. It contains 2.5 million molecules of air per cubic cm. This is said to replicate conditions between stars. So how then can we say we've ever tested light waves going through "nothing". We haven't.
To test the validity of my suspicions I've asked the science guys on reddit if they have an answer for this. The first few responses have already been hostile and that usually indicates this is one of those issues they simply don't have a good answer for. I was very polite in my question btw, so no I didn't provoke anybody, this is all on them.
We'll see how it goes. I'm open to a good explanation of why this is a valid test, but this light has 2 million molecules to interact with ever cubic cm it propagates, so you didn't rule out matter.
I hate to tell you this, but so does dust and particulate, mainly ice, float in the stellar of space too. (and gasses as well)
https://en.wikipedia.org/wiki/Cosmic_dust
Which leads some credence to the idea that the earth is getting larger as it goes through time and space.
Anyway my first thought when I was reading your topic was "crookes radiometer"
https://en.wikipedia.org/wiki/Crookes_radiometer
I dont think anyone has properly explained how this works.
But it clearly shows that light is transferring some kind of energy/mass at high speeds.
Light exists on all sorts of wavelengths as well, your heating element in your stove turns a dull red, but is still emitting light at a very low wavelength.
In fact, everything we see is basically light bouncing off of things and being absorbed at different wavelengths and then bouncing back in our eyeballs, upside down, where our brain decodes the signals, and flips it back.
So I dont get your point, really. Other than science is a farce, god is real.
edit
https://www.youtube.com/watch?v=Ji8ONGV_N6E
This is prolly the best explanation for how a radiometer works btw. I vaguely remember this explanation from physics class.
But again, all it shows is light is transporting something. energy/heat/light, its all the same thing.