earthist Posted August 6, 2009 Share Posted August 6, 2009 I had always assumed that the galaxy's "arms" were more-or-less stable structures. Thus, I assumed that the solar system would more-or-less "always" be located at a given spot in one of the arms, and would spin around galactic center along with the rest of the arm. Lately, I have heard several references to the idea that the solar system actually travels through the arms. I am confused as to why that would be the case. Cursory thinking suggests to me that the same gravitic circumstances that create the arms would be the deciding factor. But I am apparently wrong, So, can anyone please explain a) whether the solar system does actually move through the arms, and b) why this is the case. Thanks! Link to comment Share on other sites More sharing options...
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