What Is The Meaning Of Black Hole?

[arghyaghosh01 0]

I think that a black hole is also called a dark star, or, you may say invisible astronomical thing which has been there for 10 to 15 million years and which has a very high gravitational power that sucks everything into it. Would appreciate if any of you can come up with opinions about a black hole.

[SeaOfThought 0]

A black hole is a well-defined concept in astronomy. You can check it out here:
http://en.wikipedia.org/wiki/Black_hole

It is generally originated from a star, so huge, that, when it has no more fuel to keep her expanded, starts contracting (and then explodes and contracts again) until nothing can stop the force of gravity to contract it even further and further (everything gets heavier as you approach the center - so if the star is compressed every part of it will get closer to the center and therefore heavier and heavier which will lead to more compression and so on).

No one really knows what happens with such endless contraction, but the general consensus seems to be that all the matter of the star gets compressed to a single point with no dimensions. This is the basics of it, why it's called a black hole has to do with the Schwarzschild radius which you can also check on the above link.

[multfilm 0]

But of course, not everything about black holes is documented, since even that guy in the wheelchair (Hawkins?) was not omniscient; there's still some room for hypothesization. For instance:I've heard that just as liquid forms when the matter cannot stay rigid, and gas forms when its pressure is above that of the atmosphere, just like plasma forms when electrons dissociate and start freely floating, I've heard that there is a phase where even the quarks start freely floating (yeah, wonder how that would feel). So maybe what happens with black holes, is that whatever matter makes up quarks also dissociates, and then there is nothing keeping anything apart. Then it becomes one big goop of matter. Now then, a black hole becomes just one big big element on the periodic table. And as it absorbs more matter, its number on the periodic table keeps going up and up. Apparently the gravity keeps it from radioactively decaying, since anything just comes right back to it. Eventually there are so many decaying particles, that they are decaying more rapidly that coming back. And at that point, they start moving apart, and the gravity becomes less (since the particles are farther apart). Then the gravity is no longer sufficient to bring everything back, and this HUGE element decays radioactively, giving rise to new stars.