Survival miracle! What’s the price of finding a star and surviving in the black hole?

Black holes in the universe are full of mysteries. Some people say that through black holes, it is possible to travel through time and space and return to the past and future. Therefore, the exploration of black holes has never stopped.

A black hole, as the name suggests, is a hole that looks like a black hole.

Black hole is actually a kind of celestial body in the universe, because its gravity is extremely strong, making its escape speed in the event horizon faster than the speed of light, so people say that black hole is a celestial body whose curvature of space-time is so large that light can not escape from its event horizon.

Xiaobian once thought that because the gravity of black hole is very huge, the celestial bodies around it, even the light, can’t escape the fate of being swallowed by black hole.

In the universe, black holes sometimes perform spectacular “light shows” – destroying stars.

Because an international astronomical team once discovered that there is a supermassive black hole about 250 million light-years away from the earth, which is about 400000 times of the sun.

This black hole has its own “meal time”, about every nine hours it will devour the surrounding material, which is really amazing.

But there are also exceptions. Astronomers have found a special phenomenon in the galaxy, that is, there are some small objects around the black hole.

Is someone wondering why these objects are not swallowed up by the gravity of black holes? Even can survive in the black hole around!

In the galaxy GSN 069, there is a star that can avoid the huge gravity of the black hole and survive, it is a miracle of survival! But there are gains and losses, it survived, but also paid a heavy price.

The price is to absorb a lot of material from a red giant to a white dwarf, and in about a trillion years, it will become a real planet.

Are you confused about the celestial bodies mentioned above? Let’s first explain the concepts of planets, white dwarfs and red giants.


There are three conditions to be a planet

It must be a celestial body that revolves around a star; its mass must be large enough to overcome the solid stress to achieve the shape of hydrostatic equilibrium (close to a sphere); it must clear the area near the orbit, and there must be no celestial body larger than it in the orbit.

White dwarf

White dwarf is a kind of late star. According to modern stellar evolution theory, white dwarf is formed in the center of red giant.

A kind of stable star supported by repulsive force of electron incompatibility principle is a small star composed of electron degenerate matter.

Because of its white color, small size, low brightness, but high mass and density, it is named white dwarf.

Red giant

Red giant when a star goes through its long period of youth – the main sequence stage, and enters its old age, it will first become a red giant.

It is called a “giant” in order to highlight its huge size. During the giant stage, the volume of a star will expand to a billion times.

It’s called a “red giant” because it’s huge. At the giant stage, the size of the star will expand to a billion times.

As the star expands rapidly, its outer surface is farther away from the center, so the temperature will decrease and the light will be redder and redder.

Back to business, astronomer Andrew king said:

When it first approached the black hole, it was still a red giant, but after passing, the lighter hydrogen in its outer layer was sucked away, leaving only a white dwarf.

The white dwarf is trapped in an elliptical orbit around the black hole with a cycle of about nine hours.

Fortunately, it has been in an “out of reach” position since then, so it can avoid falling into a black hole.

However, the elliptical orbit is not completely free from the influence of the black hole’s gravity. After each revolution, it can be found to swing away in a slightly different direction. After two days, astronomers saw a rosette like trajectory.

Astronomers revealed this story through X-ray analysis, which can be observed at NASA’s Chandra X-ray Observatory and ESA’s XMM Newton.

Astronomer Andrew King noticed that the X-ray in GSN 069 would explode like a pendulum every nine hours, so he speculated that the star would bring the X-ray explosion when it was closest to the orbit of the black hole.

This process will continue to deprive the white dwarf of its outer material, but it will not be swallowed up by the black hole. Because it loses mass, the size of the star will expand, and the subsequent orbits will become rounder.

The white dwarf is undoubtedly lucky that it will eventually get rid of the black hole. Scientists also speculate that it may become a planet in about 100 billion years.

However, the time of this guess is more than 70 times longer than the known history of the universe, so whether it can wait until that day is still unknown!

What do you think of this? Welcome to comment area.

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