I greatly appreciate your detailed response.

I get it that we can basically observe the effects of the presence of dark matter and therefore realize it actually exists even though we can't collect direct pieces of evidence, however I find it rather confusing how matter can actually not interact with electromagnetic radiation at all. That basically means no radiation is absorbed nor reflected whatsoever.

There must be some fundamental differences between ordinary and dark matter in terms of frequency and vibration. I'm no expert though, just speaking my thoughts!

Thanks for the information!