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  1. Galaxies - NASA Science

  2. Stars and Galaxies - NASA Jet Propulsion Laboratory (JPL)

  3. Stars - NASA Science

  4. Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica

  5. Galaxy - Wikipedia

  6. Galaxies - HubbleSite

  7. What Is a Galaxy? | NASA Space Place – NASA Science for Kids

  8. Galaxies—facts and information - National Geographic

  9. Universe - NASA Science

  10. Galaxy Formation and Evolution - Center for Astrophysics