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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. Difference between the observable universe and the whole universe

  6. Overview - NASA Science

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

  8. Observable Universe - (Intro to Astronomy) - Fiveable

  9. APOD: 2018 May 8 - The Observable Universe

  10. Observable universe - (Astrobiology) - Fiveable

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