At https://phys.org/print435551406.html … new research challenges existing models of black holes as recent findings seem to show magnetic fields associated do not come up to scratch. However, for a different view of the nature of black holes go to www.thunderbolts.info/wp/2018/01/19/electric-nodes/ … we are told astronomers know black holes exist because they can see energetic radiation and collimated jets erupting. The latter are thought to result from matter falling into a black hole's gravity field. As material orbits closer it accelerates causing collisions among particles within the accretion disc. Kenetic energy converts to x-rays and other high frequency radiation. This in turn creates a powerful filamentary jet. The article goes on to mention the weaker than expected magnetic field with the claim that the electric side of electro-magnetism is largely ignored – and quotes Anthoney Peratt (plasma scientist).