dark matter - a conjecture in the dark

dark matter accounts for 80% of the total matter in the universe. what's dark matter?

scientists are still in the dark.

could it that dark matter is just like ordinary matter, only that they existed not long enough for it's light and electromagnetic waves to reach the earth; so it's not observable?

if that's the case, then all matters were created not at the same time when the big bang happened. after the big bang, new matters were created as time passed by, and when the galaxies expanded far enough, that the light of these new matters did not have enough time to reach the earth to be observed, hence scientists on earth observed a certain far-away galaxy moved in certain way which suggest there were more matters than that could be observed.


NO - conjecture is rejected.

if the phenomenon of the galaxy movement that's obesreved NOW could not be explained by whatever observable matters, the extra unobservable matters MUST be DARK matters as defined, since their em waves also would travel at the same speed as those of the obseravble matters, and they could have reached earth if those observables ones already have.