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  1. Observable universe | Definition, Size, Description, & Facts

  2. What is the Universe? - NASA Science

  3. Observable universe - Wikipedia

  4. Defining and measuring the observable universe and the whole universe

  5. Overview - NASA Science

  6. Difference between the observable universe and the whole universe

  7. Our Observable Universe | How the Universe Works - YouTube

  8. Observable Universe | Mysteries, Scale & Cosmology Explained

  9. Observable universe - (Astrobiology) - Fiveable

  10. What is the universe? - Live Science

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