Number 10.000 is a joke! 2000ly under or above galactic plane at SagA is full of black holes.Going 8000ly "west" should be "graveyard" with even more BH if im not mistaken.
As many as 20,000 black holes are predicted to settle into the central parsec of the Galaxy as a result of dynamical friction
Are there not already at least 10k black holes in the center? They seem quite common there.
Have you seen 10k BH within 3.26 LY of SagA?
Have you seen 10k BH within 3.26 LY of SagA?