Quasi-star
A quasi-star, also known as black hole star, is a hypothetical type of star believed to have existed in the beginning of the universe when most of the existing material was hydrogen and helium. Instead of a normal nuclear fusion core, the core of a quasi-star would be a black hole.
Formation and properties
Quasi-stars are stars that were so massive that while they were still alive, their cores became a black hole. But, the quasi-star didn't go supernova like in normal stars today. The star was so big that the supernova happening inside the star didn't destroy it.
These quasi-stars might have been made in dark matter halos. The gravity of these dark matter halos brought in a lot of gas, which created very big stars.
Normally in stars today, nuclear fusion stops the star's gravity from crushing it. But in quasi-stars, the black hole inside causes matter from the star to move around it. This releases a lot of energy and stops the star's gravity from crushing the star.
Quasi-stars lived for about 7 million years. The black hole at the center of the star could grow up to 1,000 to 10,000 solar masses. If quasi-stars existed the black holes they created could have become the supermassive black holes we see at the center of most galaxies, including our own Milky Way.[1] Quasi-stars were very very very big, as big as our solar system. They were also as bright and heavy as a small galaxy.[2]
