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A galaxy is a large collection of matter bound together by gravity. Visibly, a galaxy consists of stars and nebulae, along with dust clouds detectable because they block the light from stars. The stars may nor may not have planets, asteroids, or comets. In addition there are gas clouds which can be found because they alter light that passes through them. The final component is what scientists have named "dark matter", because except for its gravitational influence it can't be detected.

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Q: How Would You Describe A Galaxy?
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