Quasi-star, also known as black hole star, is hypothetically star are believed to have only existed of beginning of the universe when most a the material in the galaxy was hydrogen and helium. A Quasi-star could be as large as 10 billion kilometers or roughly large than 7.000 times the radius of the sun. Quasi-star is supermassive star with a central black hole and are both considered as potential progenitor for the formation of supermassive black hole. They are expeted to form from rapidly accreting protostars in massive primordial halos.
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- Abramowicz, Marek (August 1982). "Twinkle, twinkle quasi star…". Nature. 298 (5877): 789–790. Bibcode:1982Natur.298..789A. doi:10.1038/298789a0. ISSN 0028-0836. S2CID 45589556.
- Schleicher, Dominik R. G.; Palla, Francesco; Ferrara, Andrea; Galli, Daniele; Latif, Muhammad (2013-10-01). "Massive black hole factories: Supermassive and quasi-star formation in primordial halos". Astronomy and Astrophysics. 558: A59. arXiv:1305.5923. Bibcode:2013A&A...558A..59S. doi:10.1051/0004-6361/201321949. ISSN 0004-6361. S2CID 119197147.