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black hole
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I was wondering what will happen if an explosion where to take place in a zero air situation. Would this create a blackhole..the reasoning for this is because when blackholes are created in space its usually due to the explosion of a star that has collaps on itself therefor if we create an explosion thats as big enough in a condition such as this would it create a blackhole? Any thoughts |
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Re: black hole
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simply put: no. a black hole doesn't form simply because it's an explosion in a vacuum (i.e. "zero air"). rather, the star (one that is much, much larger than our sun, Sol) goes supernova, wherein the middle layers explode, casting off the top-most layers of gas into space. this explosion would have the power of many, many nuclear bombs. since an entire shell of the star explodes, not only is material outside the shell ejected, but material inside is imploded - that is, pushed inwards from all directions. the result is an ultra-dense lump of matter - if it has sufficient mass it becomes a black hole. thus, you would not only need a massive explosion (the kind only a star could produce) but you would need an enormous amount of matter inside the explosion (the kind only a star would have) the fact that it taken place only in space so far is circumstantial. if we could have the kind of energy and matter required here on the planet earth, then we'd have destroyed ourselves by now. it just so happens that this kind of requirement is only achievable in space. lucky for us.
--Jason
"Artificial Intelligence is the science of making computers act like the ones in movies." |
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Re: black hole
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by
on 2005-04-20 11:25:04 |
jason, are you a real doctor or just a love doctor? :P 
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Re: black hole
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i agree with the statment below but id like to add that also theres the posibility that due to the nature of mass it might form a black hole by acumulating naturally during long periods of time without the need of an explosion ps can someone tell what has to do an explosion in a vacum to a black hole thats just too weird |
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| Actually, according to theory, a star going nova is actually counter productive to creating a singularity. A singularity is formed when matter colapses in on itself, due to the force of gravity being greater than the atomic structure of the star. The more mass you have, the more likely a singularity will form. If a star goes nova, it loses mass. If you take a star that has enough mass to just barely create a singularity, and it goes nova, a singularity will not be formed because there is no longer enough mass to force the atoms to collapse in on themselves. Well at least that was theroy circa 1995. |
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i have a question its pretty dum but i wanna know... if black holes sucks in light also then if we didnt have black holes would the universe be full of light? |
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by EricSoLazy
on 2005-05-26 20:38:49
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pie- well no you can read the "why is the sky dark at night" for the reason why all the Stars dont light up the night. Also all light just isnt atracted to the few black holes in space, just the light that happens to pass by the massive pull by the distortoin of space time.
WHOOOOOOOOOOOOOOOOOOOOO
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So, how was blackhole appear? Why does it have a very strong gravitational force? It sucks everything inside..., will it 'expands'? Just curious, I should ask one at a time ;P --
-nothing is impossible to a willing heart :p-
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by Rukia_chan
on 2005-08-21 03:06:46
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| so when something get sucks in a black hole in can come out right ?? but after a veryyy long time..But u know what the idea of something capable of sucking light and its in our galaxy somewhere, it sort of creeps me out ^_^ |
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by chizuru_chan
on 2005-08-24 01:22:13 (edited 2005-08-24 01:23:08)
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any chance the earth might get sucked into it or anything? (okay, i know this is a really dumb question but can it happen?)
Life starts simply , why change them?
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by Rukia_chan
on 2005-08-24 01:53:22 (edited 2005-08-24 01:54:21)
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| I dunno really...but lets hope not ^_^, and i guess not because black holes are created because of (this is if i'm not mistaken cause i knew it a long time ago...n i sort of forgot...) gravitation pull...its sort of hard to say it but imagine a paper then but a marker on it. The middle part where u put the marker is going to bend down n create this sort of u shape (if u see it from the side). Then imagine a thing going on the paper then because of the dent the thing rolls down the dent. Black hole is sort of like that abut the dent is much much deeper , so there is a chance that we can get out of the black hole but after a veryyyyyyy long time. And the black hole cannot happen withput any cause so isuppose there wont be any near earth if our solar system isn't disturbed or somethin. Again i apologize if im wrong ^_^ |
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When a star dies, it have two possible endings. When it's mass is not sufficient to hold onto its own gases, the star would puff out gas and become a nebula like the Ring Nebula. If it has mass beyond a critical point, the gases cannot explode and collapses it on itself. When the star forms a black hole in this situation, what it had really become is what is known as a Black Dwarf (similar to a Red Dwarf but does not emit light). In this case, according to Einstein, the Black Dwarf Star's extreme mass would cause a 'dent' in the fabric of space-time. Rather like what Rukia-chan had just described with the paper with a heavy marker on top. So anything that come close to the 'slope' would fall in under its gravitational pull (which is caused by its extreme mass - See Newton's theory of gravity). Usually, once something is sucked in, it does not get out. But decays still happen inside the black hole and it would emit things like X-rays and other cosmic rays. So if you get sucked in, the only way to get out would mean you are dead and in the form of x-rays. And according to Steven Hawkings, a black hole eventually also dies as well in an explosion but different from a normal star's explosion. And according to Hawkings, those black holes formed in the middle of our galaxy in the beginning would have begun dying out. And according to some physicist, there might be things dubbed as "white hole" which is the other end of a black hole should it be able to bend the space-time. That is theoretical but it is also the how the idea of a wormhole can be formed. If you wanna know this, watch Stargate. |
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by i_want_to_flirt_with_drunk_sango
on 2006-06-29 23:30:58 (edited 2006-06-29 23:54:24)
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I had a few questions about black holes before viewing this thread but all but two were already answered as I read through: First I'm curious as to how light is drawn in to a black hole. I think I remember from high school that "light" is made of photons and electromagnetic waves, right? Well I thought these things didn't have mass since they are not atoms, so does that mean gravity can affect things without mass? Or could it be becaues ONLY the space time distortion is pulling in the light, not gravity, and they are seperate? I've heard the space-time distortion example (bent paper) used to describe gravity too, so I figured they were the same. Also if it was gravity from a black hole having an impact on "light", then by that measure on Earth, light would be as suceptable to gravity as everything else; then that should cause a flashlight's light-beam to bend toward the ground too as everything else is drawn to the ground by gravity. Obviously it doesn't, at least not visibly. I know that the gravity on Earth is no where near as strong as black hole's, but shouldn't the gravity of Earth have at least a visible effect on light from a flashlight if the fact light being affected by gravity is true, as it appears to be when light is sucked in by black holes? I'm gonna try to guess the answer to the second question is light is so fast in any form or origin that even the incredible gravity from Earth is not enough to affect it, but I'm not sure! That is why I'm asking for clarity. (sorry I made two questions into so much, it's just I got a lot of curiosity and ideas in my head when it comes to this subject) |
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Re: black hole
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by
on 2006-06-30 00:02:46 |
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Yes, light is made up of photons, which are electromagnetic waves. We all know that light travels in a strait line, right? Well, the space near a black hole is curved such that a strait line in any direction leads you towards the black hole. This can be visualized as a weight resting on a outstreached cloth. The weight pulls the cloth down so that anything resting on the cloth will roll down towards the weight. The gravitational force interacts only with particles which have a non-zero rest mass. Light has a zero rest mass. Therefore there is no gravitational interaction between a black hole and light. There is, however, a huge effect on light due to the presence of a black hole, for the fact that it bends space-time (as i just explained)! Now, the earth has an effect on time-space due to its mass as well. It is true that light passing close to the earth could be said to "bend" in this manner, however the magnitude is very small compared to the effect measured when light passes close by a star. I would predict that it is possible to setup an experiment using lasers to measure the "bending" of a beam due to the earth's mass's effect on space-time. I do not know for sure if this has been done before, but i assume it has :)
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by i_want_to_flirt_with_drunk_sango
on 2006-06-30 00:20:11 (edited 2006-06-30 00:20:31)
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Oh thanks for the clarity, and BTW I've heard that cloth (in most cases paper) example used for both gravity and the space-time bend just now. Makes me wonder about things, but I won't get into it now. One more question please, the black holes, they emit X-rays, and I always knew this but until now it just hit me as to why these things are not drawn back in if they are waves too. Should't they bend back towards the hole as well even though they are emmited from it, since the forces involved are so strong they caprture everything in the electromagnetic specrum? It just seems logical to me, but I'm problaby missing some crucial info to understand why. Are X-rays "immune" to the black hole, or are they so fast and proplelled at such a strength that the hole cannot catch them on the way back out? Or since it is a result of the expansion and decay that it naturally beats the "dent"? |
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by Flayzerannyx
on 2006-06-30 03:26:33
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| Actually the phenomena of bending of light around massive objects such as stars and even galaxies has been observed when astronomers look at old or faraway stars.. there have been observations of light from the same star appearing as 2 seperate dots in the sky. |
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Re: black hole
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by
on 2006-06-30 08:27:08 |
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Yes, this is called a gravitational lens. You can read all about it on wikipedia: http://en.wikipedia.org/wiki/Gravitational_lensing
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by i_want_to_flirt_with_drunk_sango
on 2006-06-30 19:44:01 (edited 2006-06-30 19:45:21)
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I wonder if anyone else has thought about this regarding black holes: Does anyone know what one outside of the black hole's slope would see if they could look at something past the border of the slope? And what if you could look back from there, how would the rest of the universe appear to you as you move toward the black hole? I know it's highly unlikely that such an experiment could ever occur, but I'm curious how the changes in space-time changes perspectve on both sides of a black holes slope. I've tried to figure an answer but all I could come up with was this (maybe I'll review Wikipedia later): I want to say that anything that moves past the border would seem to age rapidly, but maybe it would seem frozen because we are in normal time and I'm guessing that since time moves quickly there beyond the slope and we can't see it moving forward through time, we see it as it is in our time which is kind of in preserved state, unaffected by "our" time anymore. Or maybe it would just dissapear from our sight? And if we could look back from the slope, then the universe would problaby age rapidly as we move forward through time, or maybe everthing else would freeze as we move through time and toward the black hole? |
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Re: black hole
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by
on 2006-06-30 20:43:32 |
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first of all, the "slope" is called the "event horizon" - the point of no return for light & matter. if you were to throw a camera (or a person, or anything for that matter) towards the event horizon, the atoms the object is made of would be ripped apart. however, lets say we have a magic camera that never breaks. we put it very close to the event horizon. photons are streaming inwards from places around the outside of the black hole. no photons escape from the black hole, so we would expect to see "blackness" pointing our magic camera in that direction. however, there are actually many photons coming at our camera from the direction of the black hole, how can this be? because the black hole curves space-time, some beams of light heading toward it barely escape, but are bend in a curve around the center. also, as you mentioned, we would not see normal space when looking away from the black hole. since we are accelerating downwards towards the black hole due to gravity, events far away would not appear the same to our magical camera as they would to a person on earth. i do not know in what way they would appear different, but i would guess that the outside would appear to slow down. this guess is based on the trivial fact that due to gravity being stronger closer towards the center of the earth, our feet are just slightly "older" than our heads (by a millionth of a second or something silly like that).
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... isn't time shaped by acceleration (including acceleration due to gravity? like how time slows down the faster we travel?) so shouldn't our feet be younger since it accelerates more relatively to our heads? PS.I may very well be wrong. |
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