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

  2. Observable universe - Wikipedia

  3. What is the Universe? - NASA Science

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

  5. Observable universe - Simple English Wikipedia, the free …

  6. Difference between the observable universe and the whole universe

  7. Overview - NASA Science

  8. Observable Universe - Definition & Detailed Explanation

  9. Observable Universe | Mysteries, Scale & Cosmology Explained

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

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