What are black holes?

Question

I want to know as much as i can about black holes, thank you all for helping.

Answer 1

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

Anything that gets too close will also collapse with it the same way, whether matter or energy, even light itself, the fastest thing in the universe. This is how it acquires the name black hole.

A black hole is defined to be a region of space-time where escape to the outside universe is impossible. The boundary of this region is a surface called the event horizon. This surface is not a physically tangible one, but merely a figurative concept of an imaginary boundary. Nothing can move from inside the event horizon to the outside, even briefly.

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 energy due to quantum mechanical effects known as Hawking radiation.

hope this helps..

Answer 2

A black hole is an object predicted by general relativity[1] with a gravitational field so powerful that even electromagnetic radiation 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 boundary of this region is a surface called the event horizon. This surface is not a physically tangible one, but merely a figurative concept of an imaginary boundary. Nothing can move from inside the event horizon to the outside, even briefly.

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 energy due to quantum mechanical effects known as Hawking radiation.

Answer 3

Although black holes are where the gravity field is so intense the escape velocity is greater than the speed of light.. Then that poses a similar question answered earlier being "what is the speed of dark." ??? The same as light..not really it must be faster....
By the definition of a Black hole ,....It is obvious that gravity is greater than the speed of light.. I believe it punches a hole in the space/time continium into another universe and all the matter sucked into it, is then ejected into the other universe. Hence the birthplaces of stars,galaxies in the other universe. or simarly in our universe. Jack

Answer 4

See black holes are places in space which sucks all the energy from the near by surrounding stars, etc
It is also said to develop during a death of a star
It is filled with all the -ve energy
Time travel is said to be possible by medium of black holes

Answer 5

We talk about a black hole when the gravity of the enormous amount of mass in one location in space is so high that even "light particles" in form of energy waves will be absorbed and therefore no light emitted. Black holes are in easy words Cosmo universal vacuum cleaner sucking everything in

Answer 6

A black hole is the end result of a super massive star which collapsed in on itself and didn't stop collapsing because the gravity of the star was strong enough to overcome the sub atomic forces which keep you from being able to walk through walls.

Because there is no longer anything to stop it, theoretically the star just keeps collapsing, producing a black hole.

If you truely want to know about these in depth, go here:

Black holes start as supernovae.
http://en.wikipedia.org/wiki/Supernova

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

Answer 7

a black whole is a collapsed star, nothing can escape black holes, gravity nor light thats why its called a black whole because its black if u need more info on this subject try nasa.com time light gravity oxygen none of this can escape a black hole because the gravity pull from it is soo great.

Answer 8

I am sure you will get lots of answers on the theoretical basis for the existence of black holes,which seems very logical.
But an in depth analysis makes them a very poor candidate for a place among celestial objects.

Answer 9

a black hole is a small point with maximum gravity from which nothing can escape even light

Answer 10

a black hole is a region of space-time from which nothing (not even light) can escape to a "far away" region.