Re: 50 turns . . .
I don’t think that would be enough to counter the skewing effects of an intergalactic collision, Raoul. NGC 4622 looks like a very well-ordered spiral. This effect, I believe, would have to be formed at the source, approx. 13 billion years ago, possibly lost in the BB event itself.
Could it be that density waves have a motion that is not necessarily related to the shape of the galaxy?
That, I like. It could be completely dependant upon the attracting force of the galactic center, presumably hiding a very heavy black hole.
I wonder what the magnetosphere of a galaxy would look like -- and would the magnetotails be traceable all the way back to the point of origion...?
Dan