Question

define galaxy........​

Answer 1

a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

Answer 2

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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.