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So black holes may well be spinning but the spiral shape of our galaxy is related to stars closer to the center taking less time to orbit the center than ones further towards the edge of the galaxy. That makes sense. Thanks guys that's cleared a lot of things up.

Hi. I'm very interested in black holes but I don't know much about them and was wondering if anyone who does know something, or who has any ideas, could answer a question for me. Looking at the curved spiral arms of our galaxy swirling around the supermassive black hole that is believed to be at it's centre, I am often reminded of a liquid going down a plug hole which also has a curved path veering to the right or the left depending on which hemisphere you are in before it goes down the plug hole. It does this because the Earth is rotating, as far as I understand, so would it be reasonable to hypothesize that black holes might also be rotating?