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  1. wikipedia.org
    https://en.wikipedia.org/wiki/Black_hole

    Black hole - Wikipedia

  2. nasa.gov
    https://science.nasa.gov/universe/black-holes/?os...

    Black Holes - NASA Science

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

    What Are Black Holes? - NASA

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

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

  5. nasa.gov
    https://www.nasa.gov/missions/chandra/astronomers...

    Astronomers Find Early Fast-Feeding Black Hole Using NASA …

  6. space.com
    https://www.space.com/1542

    Black holes: Everything you need to know | Space

  7. nasa.gov
    https://spaceplace.nasa.gov/black-holes/en

    What Is a Black Hole? | NASA Space Place – NASA Science for Kids

  8. nationalgeographic.com
    https://www.nationalgeographic.com/science/article/black-holes

    What Is a Black Hole? - National Geographic

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

    10 Questions You Might Have About Black Holes - Science@NASA

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

    Black Holes | Center for Astrophysics | Harvard & Smithsonian