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I don't know if it is pushing outwards or what it's doing.
I don't know anything about it other than what I have learned when reading about it.
It seems to me we assume the laws of physics to be universal and our current laws of gravity tell us there should be mass where we do not observe it.
As we can't see it and because we can't explain this situation without more matter than we observe the unseen matter has been called dark matter,
If our gravity laws are valid, and it is somewhat reasonable to expect they are valid then something is interacting gravitationally with matter we can see (stars that are moving faster than our gravity laws predict )
So it is a curious matter.
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