Why doesn't the light come back after entering into BLACK HOLE?

Question

Not even light but any object which enter into the black hole doesnt escape from it. What is the reason behind black hole? please tell proper & understandable answer.

Answer 1

because its most intense gravity there is.

check out the link.

its quite interesting

Answer 2

The basic definition of a black hole is " an object so massive that it's escape Velocity exceeds the speed of light".First of all let's refine my above definition just a bit.What you really need to create an escape velocity greater than the speed of light, is a gravitational field strong enough to do that. And Gravitation in turn depends on the total mass of the object and the distance from the center of that mass. Somebody figured out in 1783 that a star 500 times the size of the sun, but with the same density would have an escape velocity greater than the speed of light. So the principle has been known for a long time.
But aside from having a larger object, you can achieve the same thing by having an object with the same mass as the sun, but much smaller in size, since the total gravity depends not only on the total mass but also on the distanve from the center of that mass. So, the closer you can get to the center of mass, the stronger the gravity A star with a mass greater than 3 times the sun's mass can collapse to the point where degenerate Electrons and neutrons cannot stop the collapse past the size of a normal neutron star. The star can then become small enough in size but massive enough to have a gravity field strong enough so that the escape velocity exceeds the speed of light.
The critical size which the star has to reach to create this strong gravity was figured out by a fellow named Schwartzschild in 1916, right after einstein Published his relativity theores. This size is known as the "Schwartzschild Radius". Every star has a schwartzshild radius and if that star can reach that size, it becomes a black hole.
This radius is: R= 2GM / C (squared) where G is the gravitational constant (6.67X10 (-11) and M is the mass. Then the mass is big enough to form a black hole. This is roughly 1.4 solar masses . Therefore our sun won't form a black holeHowever, to form a black hole the object must contract witin a certain radius (Schwarzshield radius). Then the escape velocity becomes bigger than the speed of light. If that happens, the objects becomes a black hole. Now you may ask: what happens if an object contracts within the Schwarzshield radius but doesn't fulfill the C-limit. Well, it will form an object with an escape velocity bigger than the speed of light.

Answer 3

I'll take a swing at giving you a layman's terms explanation, but the words "general relativity" are going to have to be used. According the Einstein's theory of general relativity (you were warned), gravity causes a curvature of spacetime such that it does affect both mass and light/energy. For example, there's a phenomenon called gravitational lensing, in which light from a star that is directly behind a massive body from Earth's point of view can still be seen because the massive body's gravity bends the light around itself. So light is affected by gravity. If you take the formula for gravitational escape velocity and plug in the speed of light, you get c^2=2*G*M/R. Hence, if the massive body has a radius R=2*G*M/(c^2) or smaller [called the Schawzchild radius], even light cannot move fast enough to get out of the gravitational field. And that's your black hole.

Answer 4

According to Einstein, gravity is not a force. Rather, what we feel as gravity is actually the result of bends in space caused by the presence of matter. Space bends in response to matter like a rubber sheet bends in response to a bowling ball set in its middle.

Everything responds to this - including light even though it lacks mass. This is how gravity can effect light even though light has no mass - light is taking the straightest possible path by curving slightly around a massive body. This effect on light is proven scientifically with phenomenon like gravitational lensing.

A black hole is so dense that the bend great enough to create an in-escapable well. Its possible to orbit a black hole, but if you get too close - if you pass what's known as the event horizon (the boarder where light can't escape) you can't get out because the escape velocity required would be larger than the speed of light, thus matter and light itself are trapped forever.

Answer 5

A black hole is an object predicted by general relativity,[1] with a gravitational field so powerful that even electromagnetic radiation (such as light) cannot escape its pull.[2]

A black hole is defined to be a region of space-time where escape to the outside universe is impossible. The outer boundary of this region is called the event horizon. Nothing can move from inside the event horizon to the outside, even briefly, due to the extreme gravitational field existing within the region. For the same reason, observers outside the event horizon cannot see any events which may be happening within the event horizon; thus any energy being radiated or events happening within the region are forever unable to be seen or detected from outside. Within the black hole is a singularity, an anomalous place where matter is compressed to the degree that the known laws of physics no longer apply to it.

Answer 6

A black hole has so much gravity that it forms a negative universe in which particles travel negative distances. Since black holes have such a strong gravity, it flings particles out from it in the negative universe. The only way for a particle to travel a positive distance is if it travels a negative distance within the negative universe. This is possible by forming a black hole in the negative universe. Since the original black hole has a mirror black hole, the particles can no longer travel any distance, negative or positive. Quarks within the black hole fuse with light entering the black hole forming enough kinetic energy to bounce some light off the edge. The quarks then lose their energy to the light, and they gain this energy back by creating gravity. The black hole combines with it's own mirror black hole and releases gravity with all the energy.

This means that when a black hole holds too much matter, it converts it to energy. When it holds too much energy, it converts it to gravity. Since gravity is massless, the black hole can release gravity into space.This is why black holes can gain matter without losing any. If you want to find out anything else, I'm sure the people above me have found the answer.

Answer 7

Massive objects warp spacetime, which has the effect of bending the trajectories of things hurtling through space, depending on their velocity. This warping is gravity. This affects light rays same as anything else. This is why satellites orbit the earth -- they want to go in a straight line, but that straight line through spacetime is bent around into a circle by the Earth's warping effect.

Since light has a faster velocity than a satellite, it is not bent much if at all by the Earth, but a large star will certainly bend light rays going by.

In the case of a black hole, there is so much mass in such a small volume that the warping of spacetime is enormous. Even light pointed away from the black hole -- and light is the fastest thing that exists -- will have a trajectory that is so bent by the warping that it curves back on itself and goes back into the black hole. If you could travel faster than light you could escape a black hole. But you CAN'T travel faster than light.

Answer 8

A black hole has a gravity field so dense that any object that enters it cannot escape. It creates a rift in space-time and "bends" the plane of space so that any particle or fieid that crosses the event horizon (the black hole's point of no return) cannot escape. Consider it an actual hole in space.

All gravitational fields have a similar effect. Even smaller bodies of mass, such as our sun or the Earth, create a dent in the plane of space. Light will travel in a straight path, unless it is disturbed by one of these dents. For this reason, when observing light from distant stars, astronomers must adjust for the deflection from other stars and celestial bodies to determine the star's actual location.

"Your mama is so fat, that she bends light" Get it?

Answer 9

Gravity bends space. Black holes are extremely massive, and thus have a great deal of gravity. Light has no mass (theoretically), but follows space - like a marble rolling on a table. If the table is warped, the marble follows the warp.

Black holes are created when a massive star dies, concentrating it's mass into a small area.

Answer 10

A black hole is the result of a very large star that has burned out and collapsed under the force of its own gravity. The gravitational pull of a black hole is such that nothing that passes its horizon can escape.

Answer 11

A black hole has a incredable pull of gravity. That gravity is so powerful that light is also pulled towards it, so it how can it escape again.

The only way that I can think of, of any escaping it again is when the black hole dies and the gravity is gone or reduced.