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Spiral Tracer?

  1. Jul 17, 2006 #1
    Spiral Tracer??

    Hello. Has anyone ever heard of a spiral tracer? and what characteristics they have??
    any good link on the topic would also be appreciated
    thank you
  2. jcsd
  3. Jul 21, 2006 #2


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    I'm not familiar with it as any special terminology, I think it just refers to something that traces spiral arms, such as neutral hydrogen gas or stars.
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