The Outer Scutum-Centaurus Arm is one of two major spiral arms in the Milky Way. It's a long stream of stars, gas and dust that spirals outward. It extends more than 360 degrees around the galaxy. The region where the Scutum-Centaurus Arm connects with the Galactic Centre has many star-forming clusters.[1]

The other major spiral arm is the Perseus Arm.

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