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What is a galaxy?
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A galaxy is a huge cluster of stars held together by gravity. There are millions of galaxies in the universe, and even the smallest contain millions of stars. Between the galaxies are vast, starless spaces. Light from the galaxies takes millions of years to reach us. | | The Virgo supercluster of galaxies |
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Previous:
Back
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Book:
1001
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Section:
Space
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Chapter:
Galaxies
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