[Bradley_A_Pliam]

I'll be up front about this. I'm in way over my head in this discussion, but in my mind, still, not all interactions are with particles. There are fields such as gravity, that affect wavelength.

And what about particles we do see? What if the debris we know is out there (the stuff of collisions and non-congealed leftover particulates, early gases since its many light years away) over immense distances have an accumulative affect? We see the red sunset but do not discern any individual particles with our eyes.

Then there are the things we don't see. Dark matter... and so much of it. I'm guessing that disproving the relevance of all of this has proven tedious, and recounting it to a newbie like myself even more tiresome!