Black holes devour galaxies, a claim that no one has ever heard of?
In the universe, a black hole has always been a mysterious existence, it is not as directly observable as other celestial bodies, it can only be calculated by indirect means (the trajectory of stars or interstellar cloud gas masses in the universe) to calculate its position and mass, and its density and gravity are quite large, can swallow everything.
In the general theory of relativity once proposed by Einstein, there is a view about the generation of gravity, that the matter that exists in the universe will bend space-time and appear "gravitational waves". The difference in the curvature and size of the curvature of the space-time bending phenomenon is determined by the mass of matter, and the gravitational force is the specific manifestation of the curvature of space-time.
Astronomers have found that black holes and neutron stars have a "megaface" beyond the century, but the black holes are a little too rude, directly "eating" the neutron star, and producing gravitational waves. This further proves the correctness of the theory of relativity.
<h1 class="pgc-h-arrow-right" data-track="5" > space-time curvature and gravitational force</h1>
Newton proposed the idea of "universal gravity" according to the law of the motion of matter, arguing that all matter itself has a gravitational force, and that the gravitational force is linked to the mass of matter (F=GMm/r).
The specific principle is that any matter has a gravitational force, and there is only a difference in the size of the gravitational force. The greater the gravitational pull of a massive object, the more gravitational material is affected by and close to the gravitationally large material, there is a so-called "fall", such as an apple landing.
The cosmic velocity is calculated in this way, and the gravitational force of different celestial bodies can be calculated according to the mass size of different celestial bodies, and the orbital speed of the satellite (earth satellite), the detachment speed (the spaceship that opens the earth's gravity) and the escape speed (the artificial object escaping the gravitational force of the sun) can be calculated.
On the basis of Newton's "universal gravity", Einstein put forward the hypothesis of the source of gravity, believing that the mass of the celestial body caused the space-time disturbance, which led the small mass object to his own side, and the reason why the small celestial body did not run directly to the mass object was also because of the mass difference that produced a certain equilibrium. He interprets this situation as the "space-time curvature" effect.
Similarly, the greater the mass of the celestial body, the greater the degree of curvature of space-time, and the more obvious the "gravitational force" embodied.
In order to facilitate understanding, individuals think that the difference in space-time bending can be seen as an adult republican child playing trampoline, the depression formed by the mass adult when moving on the trampoline is greater than the depression formed when the child moves, and when two people move together, the child will move to the depression caused by the adult, and the depression on the trampoline is similar to the curvature of time and space. So what does this have to do with "black holes"?
<h1 class="pgc-h-arrow-right" data-track="12" > black hole</h1>
A black hole is a celestial body that exists in space in modern general relativity. Gravity is so strong that escape velocities within the event horizon are greater than the speed of light. Thus, "a black hole is a celestial body with a curvature so great that light cannot escape from its event horizon."
The name "black hole" did not originate from Einstein at the earliest, but only proposed a general conceptual theory in his general theory of relativity.
Here we can make a simple statement, when a star's life expectancy comes to an end and collapses, it will collapse towards its center and become a very dense celestial body. At the same time, it also compresses the time and space inside itself, and this process of collapse will continue due to its own gravitational mass, and finally form an "incredible celestial body" that can swallow all nearby matter (including light). Later, based on this theory, the American physicist Wheeler named it "black hole".
Because the mass of this celestial body is quite large, it is already very obvious in the degree of influence of the curvature of space-time, coupled with the continuous engulfment and collapse of increasing its own mass and density, the degree of curvature of space-time caused by it is even greater, and the gravitational force generated is greater. It's just that in the early days, people didn't detect the presence of gravitational waves.
<h1 class="pgc-h-arrow-right" data-track="16" > neutron star</h1>
Neutron stars are the most densely populated stars outside of black holes. After the collapse of gravity at the end of the star, because its mass does not reach the standard of black hole formation, it can only collapse into a star between a white dwarf star and a black hole at the end of life.
If the curvature of space-time caused by black holes has exceeded the speed of light, then neutron stars are only half the speed of light. That is to say, no matter how hard the neutron star runs, it will not be able to escape the devouring of the black hole in the end. True Cosmic Edition· It flees, it chases, it can't fly with its wings."
It wasn't until recent years, when astronomers demonstrated new discoveries in the universe in the Astrophysical Journal Letters, that they first observed gravitational wave shocks from black holes devouring neutron stars, and Einstein's theory of black holes was once again verified. What's that for?
<h1 class="pgc-h-arrow-right" data-track="19" > devoured</h1>
Astronomers found strong gravitational wave signals based on gravitational wave detectors, and at first, they only observed that the signals of gravitational waves came from the depths of the universe 900 million light-years away, proving that 900 million years had passed since the "collision". Then, 10 days later, the same gravitational wave signal was observed again, 100 million light-years away from the previous one.
According to later observations, astronomers tried to find traces of electromagnetic signals generated after the collision of celestial bodies at this location, but finally returned disappointed.
This shows that the generation of gravitational waves is not an ordinary "collision", but is "swallowed". That is, the black hole pulls the neutron star into its own gravitational range, or the gravitational pull of the neutron star that has not escaped from the black hole is "eaten".
Therefore, in the process of devouring, a strong gravitational wave is generated, and the mass of the black hole and neutron star is quite large, just like two masters fighting, the surrounding air will be pulled, and this gravitational wave will be transmitted to the earth hundreds of millions of light-years away.
These two neutron star impacts on black holes just fill the gap in the scientific community's observation of black holes, which can help human beings study the formation and extinction of cosmic celestial bodies.
The collision between celestial bodies reflects that the physical knowledge is really quite strong. Suddenly, it seems that hundreds of years ago, Einstein's view of relativity when there were no observations was really quite magical? There are many shortcomings in the views, and all readers are welcome to discuss them together.