Hacker News Reader

Is there a 1:1 relationship between the rotational speed of the black hole itself and the speed of the matter falling into it? If matter would fall straight (with 0 angular momentum) towards a rotating black hole, would its matter fall in straight, or would the black hole drag the matter into rotation?

View on HN

The latter. Unlike Schwarzschild black holes, a Kerr black hole drags spacetime with it as it rotates.

The black hole in Interstellar was a Kerr black hole.

https://en.wikipedia.org/wiki/Kerr_metric

pure speculation but I would assume space around that black hole would act like a vortex, like water going down the drain. so anything get close will be dragged I guess.

Reply on news.ycombinator.com