Massive stars mark out Milky Way’s ‘missing arms’

A 12-year study of massive stars has reaffirmed that our Galaxy has four spiral arms, following years of debate sparked by images taken by NASA’s Spitzer Space Telescope that only showed two arms.
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Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_science/~3/8NpJtFMIC8A/131217085054.htm

    

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