Spirits and dark matter

I just now had a crazy thought. You see, Mormons think of spirits differently than most of us do. When most of us think of spirits, we think of beings that are immaterial and intangible. But to Mormons, spirit is a kind of matter. In LDS theology, there are two kinds of matter--ordinary matter that we're all accustomed to and spirit which is a more refined form of matter and which is invisible.

I don't know the details about the Mormon view. In Doctrine & Covenants 131:7-8 it says, "There is no such thing as immaterial matter. All spirit is matter, but it is more fine or pure, and can only be discerned by purer eyes. We cannot see it; but when our bodies are purified we shall see that it is all matter." I don't know if there's anything in Mormon scripture beyond that, so it may be that anything beyond that is speculation. I'd like to know what they mean by "fine or pure." What is impure about ordinary matter? I can't even imagine what kind of impurity might exist in atoms or subatomic particles.

But anyway, what just occurred to me is that maybe all this dark matter physicists have been telling us about is actually the Mormon spirit world! Supposedly, there is more dark matter in the universe than there is regular matter, but nobody knows exactly what it is. It's a mystery. It's invisible.

Mormons believe that Heavenly Father is a physical being who exists in this universe. It would stand to reason that the entire spiritual world would also exist as part of this universe. That means all of Heavenly Father's spiritual children exist in this universe. That includes all the angels and demons and everybody who has not yet been born into this world as well as those who have been born into this world but have died. It may also mean that every other god from every other world exists in this universe as well as their spiritual children, though I'm not sure about that. Mormons sometimes say that Heavenly Father is the god of this world, and maybe "this world" means this whole universe in which case other gods would probably be excluded.

Anyway, it's just a thought I had.