Spiral Arms
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Transcript: Doppler mapping of the disk of the Milky Way by radio astronomers has revealed spiral arms. Spiral arms are regions of enhanced star density, enhanced star formation, and large amounts of gas and obscuring dust. We live on the inner edge of what’s called the Orion arm. The arm beyond us is called the Perseus arm, and inside us is the Sagittarius and then the Centaurus arms. These spiral arms coil outward from the galactic center, trailing the direction of rotation.
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