What really bugs me is barred spirals.
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I read one theory that stated glaxies might be formed by matter being ejected from the center. (petty wacky huh?.)
I liked it because you could imagine the arms of barred galaxy forming this way. Could there be some type of "back pressure", once enough matter is ahead of the source that would cause the arms to begin rotating? The problem is (I think) the rotation would start at the center and not the ends of the arms.
Anyone up to date on barred spiral formation?