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RE: Knowledge of the universe part 1
Dark matter is only a form of matter "a hypothetical form of matter invisible to electromagnetic radiation, postulated to account for gravitational forces observed in the universe"
And for cosmic rays "Composed primarily of high-energy protons and atomic nuclei, they are of mysterious origin."
This is partially true. Dark matter is hypothetical, but if dark matter is not there, you need something else. And this something else is not something known (at is part of our universe).
Secondly, your definition of a cosmic ray is wrong. Cosmic rays can be neutrinos, photons, protons, electrons, etc. Wikipedia is sometimes very inaccurate... ;)
And cosmic rays exist. They are observed and their composition is known.
If you want to discuss this lively, please pass by the #steemSTEM channel.