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- Dictionarygal·ax·y/ˈɡaləksē/
noun
- 1. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction. Similar
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noun
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A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. The word is derived from the Greek galaxias (γαλαξίας ), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a thousand stars, to the largest galaxies known... Wikipedia