On Apr 25, 8:17*am, Yousuf Khan wrote:
On 24/04/2011 9:19 PM, Sam Wormley wrote:

On 4/21/11 7:45 AM, john wrote:

The arms break up about as frequently as
electrons break up.

Too bad you have never done any self-education about
density waves and spiral arms, John. You might want
to start hehttp://casa.colorado.edu/~danforth/science/spiral/

Actually, Sam, this study is debunking the density wave theory.

* * * * Yousuf Khan

The funny thing is I cannot ever remember hearing the density wave
theory as a credible theory.