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Concur with the observation that even edge stars don't seem to be moving fast eough to account for the weight/mass difference needed.
Conceptually, I have a problem with any cosmological theories that require 90% of our universe be "dark matter" that cannot be seen nor observed, simply for the convenience (or "beauty") of the equations needed to create closed or open universes ....
But having said that, I can only observe that Hawkings theorizes that matter can "escape" the interior of black holes quantumly.
If so, and if such escapes can "go" far enough to leave the vicinity of the black hole, then why not assume that such matter "pops" back into space to allow the expansion force that Einstein originally projected?