What are the four primary spiral arms identified by astronomers in the Milky Way?
Answer
Scutum-Centaurus, Perseus, Sagittarius, and Norma arms
Astronomers identify four primary spiral arms: the Scutum-Centaurus, Perseus, Sagittarius, and Norma arms, although their exact definition is still researched.
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What Is The Orion Arm Of The Milky Way? - Physics Frontier - YouTube
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