how black holes r formed?

Answer 1

it's formed when a star implodes on itself. gravity crushes the star in on itself until it becomes one point called a singularity. then everything goes screwy, which is a very technical scientific term......

Answer 2

A black hole is an object predicted by general relativity with a gravitational field so strong that nothing can escape it, not even light. Under the description provided by general relativity, as an object moves closer to a black hole, the energy required for it to escape continues to increase until it becomes infinite at the event horizon, the surface beyond which the escape is impossible. Inside the event horizon, the geometry of spacetime is distorted in a way that moving closer to the central singularity is inevitable no matter how the infalling object moves.

The existence of black holes in the universe is well supported by astronomical observation, particularly from studying X-ray emission from X-ray binaries and active galactic nuclei. It has also been hypothesised that black holes radiate energy due to quantum mechanical effects known as Hawking radiation.
Contents

Analysis of cosmic string breaking with formation of black holes
attached to
the ends reveals a reAnalysis markable feature: the black holes can be
correlated or uncorrelated.
We find that, as a consequence, the number-of-states enhancement
factor
in the action governing formation of uncorrelated black holes is
twice the one for
a correlated pair. We argue that when an uncorrelated pair forms at
the ends
of the string, the physics involved is more analogous to thermal
nucleation than
to particle-antiparticle creation. Also, we analyze the process of
intercommuting
strings induced by black hole annihilation and merging. Finally, we
discuss the
consequences for grand unified strings. The process whereby
uncorrelated black
holes are formed yields a rate which significantly improves over
those previously
considered, but still not enough to modify string cosmology.

Answer 3

Suppose that you are standing on the surface of a planet. You throw a rock straight up into the air. Assuming you don't throw it too hard, it will rise for a while, but eventually the acceleration due to the planet's gravity will make it start to fall down again. If you threw the rock hard enough, though, you could make it escape the planet's gravity entirely. It would keep on rising forever. The speed with which you need to throw the rock in order that it just barely escapes the planet's gravity is called the "escape velocity." As you would expect, the escape velocity depends on the mass of the planet: if the planet is extremely massive, then its gravity is very strong, and the escape velocity is high. A lighter planet would have a smaller escape velocity. The escape velocity also depends on how far you are from the planet's center: the closer you are, the higher the escape velocity. The Earth's escape velocity is 11.2 kilometers per second (about 25,000 m.p.h.), while the Moon's is only 2.4 kilometers per second (about 5300 m.p.h.).

Now imagine an object with such an enormous concentration of mass in such a small radius that its escape velocity was greater than the velocity of light. Then, since nothing can go faster than light, nothing can escape the object's gravitational field. Even a beam of light would be pulled back by gravity and would be unable to escape.

When a sufficiently massive star runs out of fuel, it is unable to support itself against its own gravitational pull, it collapses into a black hole.

In short black holes are massive stars(tens of thousand times that of Sun) which ran out of fuel and collapsed due to its own gravitational pull,the pull being so high that even light cannot escape from its surface.Hence one can never phisically see a black hole although scientifically its existence has been proven.

Answer 4

A black hole is an object predicted by general relativity with a gravitational field so strong that nothing can escape it, not even light. Under the description provided by general relativity, as an object moves closer to a black hole, the energy required for it to escape continues to increase until it becomes infinite at the event horizon, the surface beyond which the escape is impossible. Inside the event horizon, the geometry of spacetime is distorted in a way that moving closer to the central singularity is inevitable no matter how the infalling object moves.

The existence of black holes in the universe is well supported by astronomical observation, particularly from studying X-ray emission from X-ray binaries and active galactic nuclei. It has also been hypothesised that black holes radiate energy due to quantum mechanical effects known as Hawking radiation.

Answer 5

A black hole is formed when a dying star shrinks beyond the neutron star stage. While the star is burning, its heat and expanding gases help it keep its shape against the force of its own gravity, which is always pulling it inward. As the star cools, its gravity overpowers it, andthe whole surfacre begin to get smaller and smaller.
Eventually, the star has no mass at all. Everything is pulled into its center and becomes invisible. Not even the tiny particles that make up lght rays can escape the star's gravity. The star has become a black hole in space.

Answer 6

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Answer 7

Formation of black holes

According to general relativity, a black hole can form when a massive star runs out of nuclear fuel and is crushed by its own gravitational force. While a star burns fuel, it creates an outward push that counters the inward pull of gravity. When no fuel remains, the star can no longer support its own weight. As a result, the core of the star collapses. If the mass of the core is three or more solar masses, the core collapses into a singularity in a fraction of a second.

Answer 8

The black holes r formed when the stars turn dead. The stars begin to contract and then expand massively with lots of energy pulling inward. At ,last it reaches a stage where it can even take in light ,as it becomes so powerful.Such a structure is called a black hole

Answer 9

Black holes are nothing but dead stars.
At the time of death the stars are condensed to become a single atom(When all the helium atoms are vanished).i.e., Every element in the star is broken down to Hydrogen which Atomic number is 1. After this stage the star begins to shrinks and swallow the atoms near by what ever it may be.
I sucks all the nearby materials even the light particles also. That much of powerful black holes are also in universe.
The Sun will also become a Black hole one day.
But we cannot be here to see that.

Answer 10

CORRECT: Black holes are not formed. Actually, when there is no stars and any other heavenly bodies present in Universe upto long distance and there is no light from sun or any other source is called Black hole. Once, if something gone to black hole, it can't come back.

Answer 11

Well black holes simply forms at the death of a big star even more than our own sun.so when the hydrogen of a star gets completely converted into helium The death phase of a star arrives n then it goes for a supernova blast followed by the contraction n increase in density of it n it contracts to such an extent that it acquires the sizeof a lemon n its whole of mass get concentrated in that compact size. this leads to a grand increase in its gravititional attraction power n start pulling everything in it Even Light cant escape out from its grip n high attraction power!Therefore named a black hole!