The most known feature of black holes was a myth


2019-01-03 20:45:11




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The most known feature of black holes was a myth

Black holes are the strangest and most fascinating objects in the Universe. With a huge amount of mass concentrated in an extremely small volume, they will inevitably quanta collapse into the dark singularity surrounded by an event horizon, beyond which there can enter nothing. These are the most dense objects in the Universe. Whenever anything approaches a black hole, the force tearing him apart; when all matter, antimatter or radiation to cross the event horizon, it just falls to the center, a singularity, a black hole is growing and gaining weight.

But who would you do or say, black holes do not suck anything.


a Black hole in space

All the above mentioned properties of black holes are true. But we used to live with an absolutely fantastic idea: a black hole sucks in surrounding matter. This is absolutely not true and distorts the principles of gravity. The biggest myth about black holes is that they suck. We will tell you the scientific truth.

Both in principle and in practice, there are many different ways of forming a black hole. You can take a large, massive star and turn it into a supernova, so that the Central core collapsed into itself and formed a black hole. You can use as the basis for the merger of two neutron stars, when they lead to the formation of a black hole when crossing a certain threshold mass. It would be possible to collect a pile of stuff — a supermassive star or a huge cloud of liquefied gas — and get him to curl up into a black hole.

If there is enough mass in a sufficiently concentrated amount of space around it formed an event horizon. Beyond it you can escape if you move away from the black hole at the speed of light. But if you find yourself in over the event horizon, even driving at the speed of light will inevitably pave the way to a Central singularity. From the event horizon of a black hole to get away no chance.

However, for objects outside the black hole is not so simple. Because black holes are such massive objects, when you approach one of them, you begin to experience significant tidal forces. You may be familiar with the tidal forces of the moon and how they affect the Earth.

If the average, we can consider the moon as a point mass and the Earth as a point mass separated by a relatively large distance of 380,000 kilometers or so. But in reality that's not the point, and the object occupying a real volume. Some part of the Earth will be closer to the moon than others. Closer parts will experience more gravitational pull on the average; the more distant will experience less gravity on average.

However, there is something more than just the fact that part of the Earth is closer, and a part farther from the moon. Like all physical objects, the Earth is three-dimensional, which means "upper" and "lower" region of the Earth (from the point of view of the moon) will be attracted inward, toward the center of the Earth, relative to the parts located in the middle.

In General, if you subtract the average force that is felt at every point on Earth, we can see how the different points on the surface of a different feel external forces from the moon. These power lines represent the relative forces experienced by the object, and explain why the object experiencing tides, stretched on the force direction and compressed perpendicular to this direction.

The closer you are to a massive object, the more these tidal forces. They are growing even faster than the gravitational force. Because black holes are extremely massive and compact, they generate the biggest tidal forces in the Universe. That's why when you approach a black hole, you "spagettification", or stretched thin, lapsien form.

It is Clear now why you expect that a black hole will suck you: the closer you get, the stronger the force of attraction and the stronger the tidal forces tearing you to pieces.


Black hole does not suck

However, the idea that you will be sucked into a black hole, remains wrong. This is a misconception. Each individual particle constituting the object, which is exposed to the black hole still obeys the same laws of physics, including gravitational curvature of space-time generated by the General theory of relativity.

Although it is true that the fabric of space is curved by the presence of mass, and that black holes provide the greatest concentration of mass in the Universe, it is also true that the density of the mass plays no role in how the space is curved. If you replace the Sun white dwarf neutron star or a black hole with the same mass, the gravitational force acting on the Earth would not change. The total mass distorts the space around; the density has almost no to do with it.

From a Distance, the black hole will resemble any other mass in the Universe. Only when approached within a few Schwarzschild radii — you will begin to notice deviations from Newtonian gravity. However, the black hole acts just like a attractor, and objects close to her, will have the same orbits as always: circular, elliptical, parabolic or hyperbolic, with a large enough approximation.

Due to the tidal forces approaching objects can be torn apart, and since the substance is going around the black hole in the form of a disk accretion, there may be other effects: the magneticfields, friction, and heat. Part of the substance, taking into account these additional interactions may slow down and eventually be absorbed by the black hole, but the vast majority of it will still run.

The Most important thing is that black holes suck nothing; no power, which the black hole would to an ordinary object (like the moon, planets or stars). Works exclusively by gravity. The main difference is that black holes are denser than most of the other bodies that occupy less space and can be much more massive than any other object separately. Saturn can be a wonderful thing circling in orbit around the Sun, but if you put the lights is a black hole from the center of the milky Way — which in 4 000 000 times more massive than our star tidal forces are powerful enough to pull Saturn in a huge ring, so it will become part of the accretion disk of a black hole. With enough friction, heating and acceleration in the presence of gravitational, electric and magnetic fields that creates matter, sooner or later will be swallowed up and fall into a black hole.

Black holes, apparently, suck matter into only due to its weight, and the combination of tidal forces and substances already present near the black hole, breaks the object into smaller particles that are fond of the accretion disk and eventually the black hole. However, the vast majority of the substance, which will pass near a black hole would be spit out back in one form or another. Only a small part falling into the event horizon, will lead to the growth of the black hole.

If you replace the entire mass of the Universe is equivalent to a black hole and clean up the friction material in the form of accretion disks, very little of which will generally be sassano. The only friction that will be experienced by the particle is due to gravitational radiation emitted in the process of movement of particles through a curved black hole space. Only the material that formed the inner part, three times greater than the radius of the event horizon, will sacosan inside due to the behavior of Einstein's theory. But it's nothing compared to what gets into the event horizon in our physical reality.

The Idea that black holes do something to suck, it seems, has become the hallmark of these mysterious objects. But this is a myth. Black holes only grow because of gravity, nothing more. In our Universe this is more than enough.

Well, it's time to tell everyone who still knows the truth. Start in our



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