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An enormous collections of stars , planet , dust and gas which contain an average of 100 billion solar mass and ranges in diameter from 1,500 to 300,000 light years .............
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Galaxies
Explanation:
A collection of stars, gas and dust that make up the universe. A galaxy contains an average of 100 billion solar masses (or 100 billion times the weight of the sun) and ranges in diameter from 1,500 to 300,000 light-years
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