what are galaxies ?
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Explanation:
Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity. Nearly all large galaxies are thought to also contain supermassive black holes at their centers.
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A galaxy is a huge collection of gas,dust and billion of stars and their solar system. A galaxy is held together by gravity. Our galaxy, The Milky Way also has a supermassive black hole in the middle. When you look up at star in the night sky you are seeing other stars in the Milky way
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