what is known as black hole?

Question

hi i want to know more about the black holes... any one can explain me about it more basically...

Answer 1

A black hole is an object so massive that it's gravity prevents light from escaping, thus they are called black holes.

There are two main types of black holes:

1. "normal" black holes - formed when large stars die
2. supermassive black holes believed to exist in the center of galaxies

Some scientists believe that there are miniature black holes, but none are known to exist yet.

Answer 2

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.

Theoretically, a black hole can be any size. Astrophysicists expect to find black holes with masses ranging between roughly the mass of the Sun ("stellar-mass" black holes) to many millions of times the mass of the Sun (supermassive black holes).

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 an undetectably small amount of energy due to quantum mechanical effects. This is called Hawking radiation.

Answer 3

Normal matter is made up of atoms. Atoms are made of protons, neutrons and electrons. Protons, neutrons and electrons are made of combinations of tinier particles called quarks. There is a lot of empty space in atoms. When matter falls into a black hole the gravity crushes all the space out of the atoms so the black hole is a tiny ball of quarks. It may well be that quarks themselves are made of even smaller particles, and so on, so that the black hole might be an object so small as to not have any dimensions at all, just a gigantic mass.

Answer 4

A "black hole" as we can best determine is a star that has collapsed in on it's self. The density has become so high that it actually bends light that passes close to it. A "black hole" is also referred to as a "neutrino star".

Answer 5

Go to Hubblesite.org There are basics of black holes there, also whatch a show about them online at www.pbs.org

Answer 6

they r basically stars which after dying forms black hole

Answer 7

black holes are places where gravity is so strong that it sucks everything inside,even light,they form when a star or galaxy collapses

Answer 8

extremely tough point. search with yahoo and bing. it can help!