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  1. Quasi-star - Wikipedia

  2. What Are Black Holes? - NASA

  3. Black Holes | Center for Astrophysics | Harvard & Smithsonian

  4. Black holes, explained by an astrophysicist - Astronomy Magazine

  5. Black hole | Definition, Formation, Types, Pictures, & Facts

  6. 10 Questions You Might Have About Black Holes - NASA Science

  7. Black Hole Types - Science@NASA

  8. Black Holes - Science@NASA

  9. Black Holes - HubbleSite

  10. Birth of Massive Black Holes in the Early Universe Revealed