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Galaxy  Spiral Galaxy NGC 4414 9925 |
A system of about 100 billion stars. Our Sun is a member of the Milky Way Galaxy, which is sometimes just designated by capitalization: Galaxy. There are billions of galaxies in the observable universe. Exactly when and how galaxies formed in the Universe is a topic of current astronomical research.
See also: Galactic Corona, Galactic Disc, Galaxy Clusters, Lenticular Galaxy, Seyfert Galaxy, Star, Starburst Galaxy, Supercluster, Universe.
  
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