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2007-11-26 19:42:01 · 21 answers · asked by Yash G 1 in Science & Mathematics Astronomy & Space

21 answers

Get your answer from NASA. See the link.

2007-11-26 19:49:14 · answer #1 · answered by iceman 7 · 0 1

A blackhole is formed when the remnant core of an exploding star is greater than four times the mass of the sun. This whirlpool of no return is a place where nothing can escape. It is a form of a "dead" star which sucks in everything within the distance of the event horizon. The center of the blackhole is called the singularity. The concept of blackholes was developed by Karl Schwarzschild based on Albert Einstein's theory of relativity. In 1994, astronomers uncovered convincing evidence of the existence of blackholes through the use of the Hubble Space Telescope.

2007-12-01 03:46:45 · answer #2 · answered by dimplesoft 3 · 0 0

This question has been answered many times on the forum:

"By definition a black hole is a region where matter collapses to infinite density, and where, as a result, the curvature of spacetime is extreme. Moreover, the intense gravitational field of the black hole prevents any light or other electromagnetic radiation from escaping. But where lies the "point of no return" at which any matter or energy is doomed to disappear from the visible universe?" SEE this link for the answers about Black Holes:

http://archive.ncsa.uiuc.edu/Cyberia/NumRel/BlackHoleAnat.html

EDIT------ by the way it would be helpful if some of the postings were NOT elaborate CUT AND PASTE !! Just post the link to the information---- or put it in the Source "box" ,

2007-11-27 10:31:00 · answer #3 · answered by Bullseye 7 · 0 1

A blackhole is the last stage of a star. This tragic but truly amazing event is when the star collapses within itself and sucks in the matter around it. It is so powerful that NOT EVEN LIGHT CAN ESCAPE IT!!! The matter is then changed to a different type of energy.

2007-11-27 03:50:44 · answer #4 · answered by Anonymous · 0 1

A Black hole is a gravitational field that has very strong gravity; nothing can escape it in space. Although a black hole is invisible if it interacts with matter in space, such as the gas of a star you can observe that it looks like it is being sucked in because of it's gravity. A black hole is possibly no bigger than the size of the period of this sentence. Even light cannot escape it. Any quantity of matter that is compressed enough will become a black hole.

2007-11-28 22:21:04 · answer #5 · answered by rafa0794 2 · 0 0

Black Holes and Beyond

Einstein's general theory of relativity describes gravity as a curvature of spacetime caused by the presence of matter. If the curvature is fairly weak, Newton's laws of gravity can explain most of what is observed. For example, the regular motions of the planets. Very massive or dense objects generate much stronger gravity. The most compact objects imaginable are predicted by General Relativity to have such strong gravity that nothing, not even light, can escape their grip.

Scientists today call such an object a black hole. Why black? Though the history of the term is interesting, the main reason is that no light can escape from inside a black hole: it has, in effect, disappeared from the visible universe.

Do black holes actually exist? Most physicists believe they do, basing their views on a growing body of observations. In fact, present theories of how the cosmos began rest in part on Einstein's work and predict the existence of both singularities and the black holes that contain them. Yet Einstein himself vigorously denied their reality, believing, as did most of his contemporaries, that black holes were a mere mathematical curiosity. He died in 1955, before the term "black hole" was coined or understood and observational evidence for black holes began to mount.

Why Study Black Holes?
Here are some good reasons:

1. Human curiosity: they are among the most bizzare objects thought to exist in the universe.

2. They should be strong sources of gravitational waves.

3. As such, black holes should reveal much about gravity, a fundamental force in the cosmos.

4. Confirmation that they exist will strengthen confidence in current models of cosmic evolution, from the Big Bang to the present universe.

Black holes are all very well in theory, but if they really exist, how do they form?

2007-11-27 05:57:24 · answer #6 · answered by sagarukin 4 · 1 1

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A black hole is a region of space in which the gravitational field is so powerful that nothing can escape after having fallen past the event horizon. The name comes from the fact that even electromagnetic radiation (e.g. light) is unable to escape, rendering the interior invisible. However, black holes can be detected if they interact with matter outside the event horizon, for example by drawing in gas from an orbiting star. The gas spirals inward, heating up to very high temperatures and emitting large amounts of radiation in the process



You can go to www.google.com and search for more interesting information about blackholes.also dont forget to check the external links at the bottom of the page of the link posted below
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2007-11-27 03:47:47 · answer #7 · answered by A Little Sarcasm Helps 5 · 0 2

A black hole is a theoretical entity and may not exist.
However if a black hole could exist it would be a 2 to 3 solar mass sphere about 3 km in diameter whose surface gravity was such that the surface escape velocity would be greater than the speed of light.
Since not radiation could escape the surface it would be invisible. A black hole.

2007-11-27 09:55:48 · answer #8 · answered by Billy Butthead 7 · 0 1

A blackhole is an astronomical theory that said to be a passage thru another dimension in space.

2007-11-27 03:48:13 · answer #9 · answered by mcserzo 1 · 0 2

When a really large sun or star runs out of fule for nuclear fusion(deutirium and tritium) then it collapse into a super heavy object due to its enormous size and high gravitational pull within it

Thus forms a black hole.some scientists believe that black doesn't even allow light to escape from it.It is something like an unimaginably huge vaccum cleaner

2007-11-27 03:47:27 · answer #10 · answered by vazhavandan 3 · 0 2

a quantum singularity

also known as a dark star.

so dense that the gravity is so powerful that even its own light is sucked into its own gravity well.
possibly anti-matter in nature.

or maybe a wormhole vortex that leads from the interior of a galaxy into open space.

no one really knows, or can prove one even exists or how the work

2007-11-27 03:49:23 · answer #11 · answered by Obi137 5 · 0 1

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