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Supercomputers Reveal How Spiral Galaxy Arms Grow

New supercomputer simulations show how spiral galaxies like the Milky Way get, and keep, their skinny, star-studded arms. Spiral galaxies are quite common in the universe. We live in one and 70 percent of our closest galactic neighbors are spiral-shaped, too — flat, rotating disks with arms of stars, gas and dust curling outward from a central stellar bulge.

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