Stars do not orbit their galactic center with any coherence to Newtonian Physics. They orbit faster than they should in the outer reaches of their galaxy. That is why more mass with the accompagning gravity is needed to account for the faster than normal outer orbits.

It is believed that dark matter is made of very basic particles like wimps, neutrinos or other elemntal tiny bits. My idea that they come from the other side of what black holes swallow is a brand new idea that I hope is borrwed by those who will claim all the credit once a mathmatical proof is offered.

If the particles of dark matter are in a seperate dimension is also an interesting question.

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There is a 5th dimension beyond which is unkown to man. It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadows, between science and superstition and it lies betweent he pit of man's fears and the summit of his knowledge. This is the dimension of imajination.
It is an area we BS.