Quote:
On 2002-02-13 03:51, Dunash wrote:
Don't some hold that the fact that no spiral galaxy arms have been seen wound up more than 3 times limit their age to not more than 200 million years?!
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That's based on a misunderstanding of galactic arms: the current theory is that they're pressure waves, not bands of stars grouped together. So there's no "winding up" involved.