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The size comparison of a Quasi-star with other stars.

Quasi-star, also known as black hole star, is a hypothetical type of stars believed to have only existed in the beginning of the universe when most of the material in the Milky Way was hydrogen and helium. A Quasi-star could be as large as 10 billion kilometers in diameter or 7,187 times (for radius, It is 3,593.5 times larger than the Sun) the diameter of the sun.[1] Quasi-star is a supermassive star with a central black hole instead of a core and are both considered as potential progenitor for the formation of a supermassive black hole. They are expected to form from fast accreting protostars in massive primordial halos.[2]

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  1. 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.
  2. 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.