write a note on our galaxy as long
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Galaxies are collections of stars, dust, and gas rotating around super massive black holes. It is believed that there are 200 million or more galaxies in the known universe. A galaxy can range in the number of stars as well as its size.
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A galaxy is a group of many stars, with gas, dust, and dark matter. The name 'galaxy' is taken from the Greek word galaxia meaning milky, a reference to our own galaxy, the Milky Way. Gravity holds galaxies together against the general expansion of the universe.
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