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  1. wikipedia.org
    https://en.wikipedia.org/wiki/Quasi-star

    Quasi-star - Wikipedia

  2. nasa.gov
    https://www.nasa.gov/universe/what-are-black-holes

    What Are Black Holes? - NASA

  3. harvard.edu
    https://www.cfa.harvard.edu/research/topic/black-holes

    Black Holes | Center for Astrophysics | Harvard & Smithsonian

  4. astronomy.com
    https://www.astronomy.com/science/black-holes...

    Black holes, explained by an astrophysicist - Astronomy Magazine

  5. britannica.com
    https://www.britannica.com/science/black-hole

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

  6. nasa.gov
    https://science.nasa.gov/universe/10-questions-you...

    10 Questions You Might Have About Black Holes - NASA Science

  7. nasa.gov
    https://science.nasa.gov/universe/black-holes/types

    Black Hole Types - Science@NASA

  8. nasa.gov
    https://science.nasa.gov/.../hubble-black-holes

    Black Holes - Science@NASA

  9. hubblesite.org
    https://hubblesite.org/contents/articles/black-holes

    Black Holes - HubbleSite

  10. nasa.gov
    https://www.nasa.gov/universe/birth-of-massive...

    Birth of Massive Black Holes in the Early Universe Revealed