You're being silly. There is no point of origin. Space is expanding. The effects of dark matter have been observed for several decades including the collision of two galaxies mentioned in the article.
Utter nonsense. If "space" was expanding then molecules would be growing larger.
If dark matter existed, then its gravity (that's why scientists want to pretend it exists, remember) would pull matter toward it, taking into account the "dark matter" map that you see in the article for this thread, which isn't uniform.
The truth is that dark matter is fiction.