What is a Black Hole? What is there on the other side of the Black Hole? What happens if someone enters it?

Answer 1

A black hole is an object predicted by general relativity with a gravitational field so strong that nothing can escape it — not even light.

A black hole is defined to be a region of spacetime where escape to the outside universe is impossible. The boundary of this region is a surface called the event horizon. This surface is a set of points (not an actual substance) in spacetime. Nothing can move from inside the event horizon to the outside, even briefly.

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 hypothesized that black holes radiate energy due to quantum mechanical effects known as Hawking radiation.


General relativity (as well as most other metric theories of gravity) not only says that black holes can exist, but in fact predicts that they will be formed in nature whenever a sufficient amount of mass gets packed in a given region of space, through a process called gravitational collapse; as the mass inside the given region of space increases, its gravity becomes stronger and (in the language of relativity) increasingly deforms the space around it, ultimately until nothing (not even light) can escape the gravity; at this point an event horizon is formed, and matter and energy must inevitably collapse to a density beyond the limits of known physics. For example, if you compressed the Sun to a radius of three kilometers (about four millionths of its present size), the resulting high density would create an event horizon around it, and thus a black hole.

A quantitative analysis of this idea led to the prediction that a stellar remnant above about three to five times the mass of the Sun (the Tolman-Oppenheimer-Volkoff limit) would be unable to support itself as a neutron star via degeneracy pressure, and would inevitably collapse into a black hole. Stellar remnants with this mass are expected to be produced immediately at the end of the lives of stars that are more than 25 to 50 times the mass of the Sun, or by accretion of matter onto an existing neutron star.

Stellar collapse will generate black holes containing at least three solar masses. Black holes smaller than this limit can only be created if their matter is subjected to sufficient pressure from some source other than self-gravitation. The enormous pressures needed for this are thought to have existed in the very early stages of the universe, possibly creating primordial black holes which could have masses smaller than that of the Sun.

Supermassive black holes are believed to exist in the center of most galaxies, including our own Milky Way. This type of black hole contains millions to billions of solar masses, and there are several models of how they might have been formed. The first is via gravitational collapse of a dense cluster of stars. A second is by large amounts of mass accreting onto a "seed" black hole of stellar mass. A third is by repeated fusion of smaller black holes.

Intermediate-mass black holes have a mass between that of stellar and supermassive black holes, typically in the range of thousands of solar masses. Intermediate-mass black holes have been proposed as a possible power source for ultra-luminous X ray sources, and in 2004 detection was claimed of an intermediate-mass black hole orbiting the Sagittarius A* supermassive black hole candidate at the core of the Milky Way galaxy. This detection is disputed.

Certain models of unification of the four fundamental forces allow the formation of micro black holes under laboratory conditions. These postulate that the energy at which gravity is unified with the other forces is comparable to the energy at which the other three are unified, as opposed to being the Planck energy (which is much higher). This would allow production of extremely short-lived black holes in terrestrial particle accelerators. No conclusive evidence of this type of black hole production has been presented, though even a negative result improves constraints on compactification of extra dimensions from string theory or other models of physics.

Answer 2

A black hole is a super massive object srunk to a tiny size that produces VERY LARGE amounts of gravity.(Light cannot escape ,hence "Black" Hole) they are about 30+ times more massive than the sun but do to the extream gravity they are srunk to a tiny size which produces even more gravity. the higher the density the higher the gravitational pull.

There is nothing on the other side of a black hole if one gets to close to a black hole they would be torn apart and would not live to see what happens.

Answer 3

Black hole is a star that dies because of its own gravity. It collapses into a very tiny ball of matter with a density of (or at least close to) infinity. Even light, the fastest thing in the universe, cannot escape the greatness of its gravity. Once something/body enters it, it cannot get out.
Nobody knows what happens to it, because it is not observable. The only way to know what happens inside is by entering it, but once you're in you cannot get out to tell others about it : )

Answer 4

There is no inside to a black hole. People keep trying to apply the laws of spacetime to an area beyond the event threshold when those laws no longer mean anything at that point.

Answer 5

Well..... in lay man's language black hole is same as an assholee!!!!!! It's a dangerous thing its created by the death of a star & if something enters a black hole then it comes out from the other side completely squessed out!!!! Its gotta high gravity so it virtually pulls everything near it & then swallow it!!!!!! Thats all.

Answer 6

A black hole is like a government. It's black and unseeable, it's gravity sucks everything in and makes it larger and larger, and emits nothing but harmful rays. We don't know if there's anything beyond because nothing that goes in ever comes out.

Answer 7

its a time independent planet. on this Time has no sense. you will be in past, present and in futrue, if u enter there. your mind will be refused to think. you will be a sense less being.

Answer 8

http://en.wikipedia.org/wiki/Black_hole

Answer 9

U CAN HAVE D BEST ANSWER FRM THE BOOK CALLED ''A BRIEF HISTORY OF TIME'' BY STEPHEN HAWKINGS.

Answer 10

If you enter it, your gonna die!!!