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- A galaxy is a large astronomical structure containing several billions of stars and other astronomical bodies, looking like a more or less regular spiral with a thick core and thinner edges.
- The Milky Way is the galaxy where our Earth is located, it has about 200 billion stars.
- The known universe contains billions of galaxies.
- (special) The galaxy : the galaxy we live in, the Milky Way (very often employed with the definite article).
- Some science-fiction writers imagine that mankind will one day settle an empire throughout the galaxy.