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Galaxies are long-lived gravitational systems where stars, gas, dust, and dark matter evolve together over billions of years. Their visible structure is shaped by gravity and angular momentum, while dark matter dominates the total mass and governs rotation far beyond the stellar disk. Stars form inside cold molecular clouds, regulated by internal dynamics, feedback from massive stars, and energy released near galactic centers. Most large galaxies host supermassive black holes whose activity can
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