Dear Noreese,
The Theoretical Physicists have no idea. They calculate how much mass there has to be to confirm their "theories". To be "right" there has to be 90-95% more mass so they concoct the theory of "dark mass". They do not know yet what mass is! That is physical science nowadays.
Theoretical Physics is hardly a science anymore. It is dogmatic like a religion. QM and RT are declared the absolute truth. Everything pointing in an other direction is ignored and by definition a paradox.
When we grow up we do not believe in fairytales anymore but the biggest fairytale of all; parallel worlds, relativity of time and space, not 3 but 11 dimensions, membranes etc. we have to believe or otherwise we are idiots!
Just do not believe scientists anymore because that is a waste of time.
Carel van der Togt