Even Sunspots and Ball Lightning are assumed to be Dark Matter Black Holes.
However All Dark Matter has minimal Inertia, because it is not formed by Quarks (baryonic) matter but made from naked strings compacted into globule knots, by the pressure of the oscillating Axion vacuum Space Frame.
see: Galaxy Cluster Merging and Vacuum Absorption by black holes
as a Support for a Contracting Universe
