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  1. Galaxy - Wikipedia

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

  3. Galaxies - NASA Science

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

  5. Milky Way - Wikipedia

  6. Galaxies - HubbleSite

  7. Galaxies—facts and information - National Geographic

  8. What’s a galaxy? All you need to know - EarthSky

  9. How Galaxies Work | HowStuffWorks

  10. what is galaxy? all you need to know about it ... -