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How are the spiral arms of the milky way detected?
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How are the spiral arms of the milky way detected?

User Sahil Ralkar
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The spiral structure emerges when galactic clusters (open), H II regions and O & B type stars (young stars) are used as tracers. We know this to be true as other pinwheel galaxies exhibit the same patterns across these tracers as in the milky way.
User Tom Copeland
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