QUOTE(Awakened_Angel @ Oct 5 2009, 01:21 PM)
-how it occurs when a star blows up
when a star explodes, it will expand at unimaginable rate to mind blowing sizes.... and when it reach max point, it`ll bounce back... take a spring for example... when u toss it, it will elongate till a point and it`ll bouce back... at that point, the star contracts at the same rate it expand to very dense "rock" some rock turn out to be white dwaf; some become dead star; some become black hole...
-why it keeps 'eating' light/mass near itnk you should
i think you should read on space continumn on this.. i recommend stephen hawking`s brief history of time and the universe in nutshell
once you read it, you`ll understand everything
Well the spring explanation u talked on is just a simple analogy. in fact the whole life of a star is just a fighting between gravity and nuclear reaction. if the expansion due to nuclear fusion win, then the star keep on expanding, so, when the fuel is out, the expansion will tend to be smaller, so expansion to outward direction is getting more and more weaker than gravity. when gravity grew stronger so is the bending of the light become more and more. so, when the gravity grew stronger untill a certain limit (this is quite simple but in fact a complicate process. i cant talk in more technical terms here, involve too many things) even the light from the star itself is bent to the inward direction towards the star(think of this as a 180 degree), so light cannot escape from the star. since all observables involve light signal, so no light means that we cannot see it directly, so it is black in the area! because the gravity is so strong that even light cannot escape from falling back into the star, so it is like a hole sucking everything, even the light while we cannot see and setect the hole directly, so in simple word this is a "black hole".
am i making any confuse? comment on it.
Added on October 8, 2009, 3:16 pmQUOTE(Awakened_Angel @ Oct 5 2009, 04:55 PM)
agreed
I was scold the hell out of my parents when I say I wana study astrophysic for my Uni...
Well, if u seriously interested in this and wants to make it ur career, the n u shld convince ur parents that u are not playing around with it! regarding the job prospect, it does have little selection if campare with engineering or economics or even administration, but, there are many job u can take too if u search carefully.
Malaysians(including me) are too ignorant in this kind of things that they think that a researcher cannot have a good income compare to others. yes, we cannot make an income of 1 million per yr or even per week unless we invent something which is every valuable, but we still can have a moderate income which is sometimes is better than an office worker. our working time is flexible also. so u have to conviced ur parents that u are serious! this is thew most important thing.
actually i'm quite happy seeing that there are still people in Malaysia who interestered in all this kind of knowledge. this kind of knowledge is not useless but have a variety of usage, some already applied in other field, some maynot, probably due to other reason like we still have no technology that can apply them etc.
Added on October 8, 2009, 3:23 pmQUOTE(empire23 @ Oct 7 2009, 08:05 PM)
Schwarzchild Radiussssss........
Schwarzchild radius derived when Schwarzchild solvingfor the exact solution of Einstein equation for the spherical, non rotating mass. Any non-rotating and non-charged mass that is smaller than the Schwarzschild radius forms a black hole. The solution of the Einstein field equations is valid for any mass M, so in principle (according to general relativity theory) a Schwarzschild black hole of any mass could exist if conditions became sufficiently favorable to allow for its formation. The Schwarzschild black hole is characterized by a surrounding spherical surface, called the event horizon, which is situated at the Schwarzschild radius, often called the radius of a black hole.
quote from wikipedia. is it clear for u?
Added on October 8, 2009, 3:30 pmQUOTE(empire23 @ Oct 7 2009, 08:05 PM)
IIRC there is a distinction between Black holes and a worm holes, the former having no end and the latter having an exit.
The reason why they're black? Well, simply they bend spacetime itself, all gravity bends space and once space becomes infinitely deep and the curvature of space itself is also infinite once you get to the singularity in the middle.
there are in deed distinction between black holes and worm hole as u said. and should have been tell u is that worm hole is not neccessarily connecting black hole, they are just a warp through spacetime which we can travel from 1 point to other through a short cut. but anyway there are in fact a hypotetical object only. no proof of a worm hole is given yet. even the black hole has not been found yet, although we do have a few candidate which we suspect that they are black hole. u can search for candidate for balck holes if u interested. in fact the supermassive black hole in the center of our galaxy is one of the candidate for balck hole.
regarding why it is black, read my above argument.
This post has been edited by nobunaga84: Oct 8 2009, 03:35 PM 
Oct 8 2009, 11:52 AM
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