Ugh..this writing style, so unreadable. I think the first paragraph could be rewritten better as: "Dark matter puzzles us. Einstein's theory of gravity, plus

Ugh..this writing style, so unreadable. I think the first paragraph could be rewritten better as: "Dark matter puzzles us. Einstein's theory of gravity, plus known matter and radiation in the Universe, including particles and antiparticles described by the Standard Model, cannot explain cosmic observations. We need an additional gravity source - dark matter."