Friday, May 13, 2022

Quasi-stars: the hypothesis of the origin of the supermassive black hole

Black hole suns are known to science as a quasi-star that, unlike modern stars, maintained by nuclear fusion in their cores, their energy comes from material dredged up by a central black hole. It is estimated that they were formed in the early Universe, when matter was densely packed and most of the material in the galaxy was hydrogen and helium - as other material would be a problem for their existence - therefore never again. could exist because the Universe continues to expand, and what we would see would just be their corpses traveling light-years away. 
While the idea of ​​the existence of quasi-stars is considered highly theoretical, there is a reason it exists. They are often confused with quasars — luminous, energetic objects in the far reaches of the Universe, created by the activity of a supermassive black hole at the center of a galaxy. They are active nuclei larger than an existing star, but smaller than the minimum to be considered a galaxy. Quasars are the centers of galaxies with an active nucleus, while quasi-stars are just stars that, despite being massive, are still too small to rival a galaxy in size, despite carrying the same amount of mass as a galaxy. small.
 It is estimated that the size of a quasi-star could reach up to 10 billion kilometers, equivalent to 67 AU (Astronomical Unit: the distance of the Earth from the Sun). Pluto, for example, is about 40 AU from the Sun, and it took the New Horizons spacecraft 10 years to get from our planet to Pluto, which would take about 5 more years to get close to a quasi-star. Despite this, the quasi-star is not bigger than the Solar System, even though not even the National Aeronautics and Space Administration (NASA) has this kind of answer in a definitive way, and that's considering its distance from the heliopause, the most extreme border. of our system. 
the hypothesis 
It is believed that a quasi-star would have formed at the time when a large protostar (a candidate to become a star) would have collapsed in on itself with its large core, becoming a black hole in the process due to its layers. outermost ones are massive enough to absorb the implosion of energy without being repelled — as is the case with current supernovas when they reach the end of their lives. This is why quasi-stars have been attributed to one of the explanations for the origin of the supermassive black hole, the centers of many galaxies. The other hypothesis is that it would be a supermassive star, which would have 17 times the mass of the Sun, with an average temperature of about 29.7 thousand degrees Celsius. This type of star also no longer exists.

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