A galaxy is a massive system of stars, gas, dust, and dark matter bound together by gravity. Galaxies come in various shapes, such as spiral, elliptical, and irregular. Our galaxy, the Milky Way, is a spiral galaxy containing billions of stars, including our Sun. Galaxies are the fundamental building blocks of the universe, often grouped in clusters and superclusters, and they play a key role in the structure and evolution of the cosmos.

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