Anybody Love Black Holes?

[Bahamut]

Please help me!

I need info on black holes... I hope somebody is interested about it so he/she can give me juicy tidbits about it, and which sites are the best, etc.

Please someone be nice enough! [img]smile.gif[/img]

Thanks in advance

[Lord High Eater of Legs]

Originally posted by Bahamut: Please help me! I need info on black holes... I hope somebody is interested about it so he/she can give me juicy tidbits about it, and which sites are the best, etc. Please someone be nice enough! [img]smile.gif[/img] Thanks in advance

Black holes are created when a planet its completely destroyed, after going through the red giant-white dwarf phase, the gravitational pull of the planet then sucks itself inside itself, forming a black hole, hope ive been of good service [img]smile.gif[/img]

[Bahamut]

It's a good start! hehehe thanks man!

Anything else? Help ol me!

[Triconan]

I just learned this in science class so here goes

Nothing can escape black holes not even light
They are formed by a huge star imploding on itself
Scientist find where they are by watching the patterns of objects moving in
space
Scientists assume there is at least one black hole in our galaxy.

Whew I hope this helps.

[whacky]

Now if i remember correctly :
Black holes were first encountered as mathematical "freaks" in einstien's equations of relativity, yes it is right that they are formed when stars collapse inwards. At the centre of a blackhole is a singularity, a point so dense that noting can escape its gravitational pull. As light tries to get out of a black hole it experiences a red-shift due to loss in energy used in escaping the black-holes gravity. It is also presumed that the singularity of a blackhole might actually connect it to a white-hole, something fundametally opposed to a black-hole. Hence the combination forms a "worm-hole" connecting one parallel universe to another.
Hope tha is of help [img]smile.gif[/img]
-Whacky

[Azred]

Only stars that are at least 3 solar masses (3 times the mass of our Sun) can become black holes at the end of their lifespan; stars smaller than this simply become brown dwarves.
The intense gravitational fields generated by black holes will convert any matter into x-ray bursts, as in the case of Cygnus-X1; in fact, only by observing such secondary effects is it possible to locate suspected black holes.
Why are black holes "black"? Gravity bends light; a black hole's gravity is so strong that any light that might be emitted from the collapsed star is bent to the point that it never "escapes". Any object that neither emits nor reflects light is invisible.
It is suspected that there are "super-massive" black holes at the center of all galaxies, but we cannot yet filter out all the interference from the dense star fields near galactic centers to make any reasonable observations.
All known laws of physics break down at the event horizon, or Swarzchild radius, making it impossible to know what is going on inside a black hole.
Stephen Hawking hypothesizes that black holes do emit a form of radiation and eventually disappear. The smaller the hole the faster it emits and disppears. Also, his hypotheses allow for the existence of miniature black holes that exist for only milliseconds.

That's just some starter information; a reasonable Internet search will turn up much more information. Good luck! [img]graemlins/petard.gif[/img]

[Attalus]

Good reply, Azred. This is from The World Book's article. The link is: http://www.aolsvc.worldbook.aol.com/.../wbArticle.jsp

Black hole is a region of space whose gravitational force is so strong that nothing can escape from it. A black hole is invisible because it even traps light. The fundamental descriptions of black holes are based on equations in the theory of general relativity developed by the German-born physicist Albert Einstein. The theory was published in 1916.

Characteristics of black holes. The gravitational force is strong near a black hole because all the black hole's matter is concentrated at a single point in its center. Physicists call this point a singularity. It is believed to be much smaller than an atom's nucleus.

The surface of a black hole is known as the event horizon. This is not a normal surface that you could see or touch. At the event horizon, the pull of gravity becomes infinitely strong. Thus, an object can exist there for only an instant as it plunges inward at the speed of light.

Astronomers use the radius of the event horizon to specify the size of a black hole. The radius of a black hole measured in kilometers equals three times the number of solar masses of material in the black hole. One solar mass is the mass (amount of matter) of the sun.

No one has yet discovered a black hole for certain. To prove that a compact object is a black hole, scientists would have to measure effects that only a black hole could produce. Two such effects would be a severe bending of a light beam and an extreme slowing of time. But astronomers have found compact objects that are almost certainly black holes. The astronomers refer to these objects simply as "black holes" in spite of the small amount of uncertainty. The remainder of this article follows that practice.

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.

Galactic black holes. Most astronomers believe that the Milky Way Galaxy—the galaxy in which our solar system is located—contains millions of black holes. Scientists have found a number of black holes in the Milky Way. These objects are in binary stars that give off X rays. A binary star is a pair of stars that orbit each other.

In a binary system containing a black hole, that object and a normal, visible star orbit one another closely. As a result, the black hole strips gas from the normal star, and the gas falls violently toward the black hole. Friction between the gas atoms heats the gas near the event horizon to several million degrees. Consequently, energy radiates from the gas as X rays. Astronomers have detected this radiation with X-ray telescopes.

Astronomers believe that a number of binary star systems contain black holes for two reasons: (1) Each system is a source of intense and variable X rays. The existence of these rays proves that the system contains a compact star—either a black hole or a less compact object called a neutron star. (2) The visible star orbits the compact object at such a high velocity that the object must be more massive than three solar masses.

Supermassive black holes. Scientists believe that most galaxies have a supermassive black hole at the center. The mass of each of those objects is thought to be between 1 million and 1 billion solar masses. Astronomers suspect that supermassive black holes formed several billion years ago from gas that accumulated in the centers of the galaxies.

There is strong evidence for a supermassive black hole at the center of the Milky Way. The clearest indication of its presence is that several dozen stars are moving very rapidly near the galactic center. The fastest one is moving at a speed of 870 miles (1,400 kilometers) per second. The motion of the stars leads astronomers to conclude that an unseen object weighing 2.6 million solar masses lies at the galactic center. Other evidence shows that the object's radius is less than 300 billion miles (480 billion kilometers). The only known object that could have that mass and be so compact is a black hole.

[Bruce The Aussie]

all i can add is that the "singularity" is called a nuetron star and is super heavy. a pin head sized neutron star is like 100 million tons or something like that. other than that, all i know is andromeda (the starm ship) was caught on the event horizon of a black hole for 300 years.

i could tell you a million more usless sci fi bits on info but there not black hole related [img]smile.gif[/img]

[SomeGuy]

www.ravenna.com/blackhole.html [img]graemlins/hehe.gif[/img] It's the Black Hole of The web!

[Heartless Butterscotch]

I think someone mentioned Stephen Hawking. His book, "A Brief History of Time : From the Big Bang to Black Holes" can be had at your local library. You'll get an "A" for effort just for attempting to understand his work.

Interesting idea to consider: Black holes are so impossibly dense that it's been theorized that our universe could be the center of a black hole.

**Cue Twilight Zone music**