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  1. Curved space - Wikipedia

  2. Shape of the universe - Wikipedia

  3. 42 Curved Space - The Feynman Lectures on Physics

  4. What is the shape of the universe? - NASA

  5. Curvature of Space | Is space flat or curved? - Sky & Telescope

  6. Introduction to Astronomy - Weber State University

  7. The Curvature of the Universe Background - Department of …

  8. The CMB and the Curvature of Space - Physics LibreTexts

  9. The Curvature of Space - Scientific American

  10. 1854: Riemann’s classic lecture on curved space