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  1. Spacetime - Wikipedia

  2. Space-time | Definition & Facts | Britannica

  3. What is space-time? - Live Science

  4. What Is Spacetime Really Made Of? | Scientific American

  5. What Is Spacetime? - Scientific American

  6. 1.2: The Spacetime Interval - Physics LibreTexts

  7. What Is Spacetime, Really? - Stephen Wolfram

  8. Lecture 1.4: Space, Time, and Spacetime - MIT OpenCourseWare

  9. GP-B — Einstein's Spacetime - Stanford University