There is a very interesting article in the October "Scientific American" about spiral arms and bars in galaxies. In particular it seems to go along with the idea that not just stars but gas and dust are very significant factors with regards the development of spiral structures in galaxies.
It also mentions how limited computing power was always a big problem in the early days (as recently as the 1980s) trying to analyse these structures. There is a lot more computer power now of course but even so I wonder if there is enough to do these problems full justice?
Best wishes from the Grumpy Old Codger Cliff
The non amateur stuff. Hawking, black holes, that sort of thing
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