what is define galaxy?
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A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. 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 stars in the night sky, you're seeing other stars in the Milky Way.
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any of the large systems of stars, etc. in outer
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the system of stars that contains our sun and its planets, seen as a bright band in the night sky
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