Scutum–Centaurus Arm

The Scutum–Centaurus Arm is a major spiral arm of the Milky Way, extending from the galaxy’s central region toward its outer disk.

Milky Way: The barred spiral galaxy containing the Sun and its planetary system. The Scutum–Centaurus Arm is one component of this galaxy’s disk.
Spiral density wave theory: A theory that explains spiral arms as regions of enhanced density moving through a rotating galactic disk. It describes how a long-lived arm pattern can persist as stars orbit the galaxy.
Westerhout 2: A massive star-forming region in the Milky Way associated with the Carina–Sagittarius Arm. It illustrates how prominent star-forming regions help map neighboring spiral structure.
Milky Way spiral structure: The arrangement and geometry of spiral arms in the Milky Way’s disk. Different maps disagree on how the arm connects to neighboring segments.
Spiral galaxy: A galaxy whose disk contains a spiral pattern of stars, gas, and dust. The Milky Way’s arm belongs to this broad galactic form.
Differential rotation: Rotation in which different parts of a system orbit at different angular speeds. The Milky Way’s varying orbital speeds shape and wind its spiral pattern.
Carina Nebula: A large, active star-forming nebula in the Milky Way’s Carina–Sagittarius Arm. It provides a nearby comparison for star-forming complexes in major arms.
Galactic rotation curve: A plot of orbital speed against distance from the center of a galaxy. Rotation measurements constrain the arm’s location within the disk.
Galactic disk: The flattened, rotating region of a galaxy containing most of its stars, gas, and dust. The arm is a large-scale structure within the Milky Way’s disk.
Star formation: The process by which dense regions of gas collapse to form stars. The arm’s gas-rich regions host sites where new stars form.

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