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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. What is the universe? - Live Science

  7. What is the universe made of? - Center for Astrophysics

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

  9. How Big is the Universe? A Theoretical Physicist Explains

  10. Observable vs. Entire Universe | Overview, Size & Difference

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