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From: moroney@world.std.spaamtrap.com (Michael Moroney)
Newsgroups: sci.physics
Subject: Re: Asymmetrical GRCs
Date: Sun, 25 Nov 2018 14:10:40 +0000 (UTC)
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john <johnsefton288@gmail.com> writes:

>If there were a 'slow side ' and a 'fast side', in about two rotations 
>most of the stars would be on the 'slow side'.

What do you think the arms of spiral galaxies are?

They're just regions where many stars have caught up with each other
temporarily.