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Quasi-star - Wikipedia
What Are Black Holes? - NASA
Black Holes | Center for Astrophysics | Harvard & Smithsonian
Black holes, explained by an astrophysicist - Astronomy Magazine
Black hole | Definition, Formation, Types, Pictures, & Facts
10 Questions You Might Have About Black Holes - NASA Science
Black Hole Types - Science@NASA
Black Holes - Science@NASA
Black Holes - HubbleSite
Birth of Massive Black Holes in the Early Universe Revealed