Dec 19, 2022 07:00:00

What is a ``black hole star'' that is said to have existed in the early universe?

Black holes are celestial bodies that are actively discussed and discovered , but it is said that there were super-giant celestial bodies called ' black hole stars ' in the early days when the universe was born. Kurzgesagt , a scientific YouTube channel, explains the formation and properties of such black holes with animation.

Black Hole Star - The Star That Shouldn't Exist - YouTube


A black hole star, which has a black hole in the center of the star, is thought to be a celestial body that could have existed only for a short period in the early days of the formation of the universe.

At more than 800,000 times the diameter of the Sun, the black hole was 380 times larger than the largest known star,

Stevenson 2-18 , making it the largest star ever to exist. It seems.

In general, new stars are born when matter gathers in the densest place in a huge cloud of hydrogen gas, generating great heat and pressure and causing a

nuclear fusion reaction .

These stars will grow between the release of radiation from nuclear fusion and the gravitational pull that pushes it back.

When a heavy star reaches the end of its life and nuclear fusion reactions stop, it undergoes a gravitational collapse .

On the other hand, it is thought that the universe hundreds of millions of years after the

Big Bang , when black holes existed, was narrower, denser, and hotter than it is today.

In the early universe, a huge structure called 'dark matter halo' where

dark matter gathered was formed, and it is said that the first stars and galaxies were created by taking in a large amount of hydrogen gas.

It seems that the stars formed by the strong gravity of the dark matter halo have grown to an incredible size by repeatedly accumulating hydrogen gas.

A star with too much mass and pressure will not be able to keep its balance, and a

supernova explosion will not destroy the star.

Therefore, there is a core black hole at the center of this star, and thus a black hole star is born.

Generally, matter that is taken into a black hole orbits around the black hole.

The orbiting material heats up due to friction between particles, and emits radiation, blowing away other surrounding materials.

As a result, the black hole will grow slowly.

In black hole stars, on the other hand, matter is pushed directly into the black hole by the enormous pressure around the black hole.

This extremely violent process releases more energy, making it hotter than the core of any star.

As a result, intense

radiation pressure is released, and the black hole star continues to expand.

A black hole star, which is more than 30 times the size of our solar system, blows out a

jet of plasma from the pole of the black hole, breaks through the star, and jumps out into space.

However, it seems that the black hole that became too active has blown away the black hole star body.

One of the biggest mysteries in the universe, the

supermassive black hole at the center of the galaxy, cannot be explained by modern astronomy, so it is thought that the existence of black hole stars may be able to explain it.

While common black holes grow slowly over billions of years, some supermassive black holes are thought to have been born just 690 million years after the Big Bang, suggesting that black hole stars The black hole may have been the source of the supermassive black hole.

The James Webb Space Telescope is said to be able to observe the early universe, which was previously impossible to observe, suggesting the possibility of observing the existence of black hole stars.