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| Tweet Topic Started: May 13 2011, 06:12 AM (1,000 Views) | |
| labouka | Jun 8 2011, 05:24 AM Post #31 |
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Ruler of Black Holes
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YOU sir (or madam) are officially now my favourite person in the world. :joy: WANT TO LEARN ABOUT BLACK HOLES ??? :joy: No one's best at this subject than ME Let's get started ^_^ ^_^ ^_^ : Black Holes are one of the most marvelous (and dangerous) happenings in the whole universe. Their creation is only a taste of their awesomeness. To begin with, they were foreshadowed by Einstein's General Theory Of Relativity. Black Holes are created from dying superstars. With the term 'superstar', we refer to stars that are 1064 bigger than our Sun (imagining the actual size is enough to blow your mind). When a star dies there are only 3 outcome's depenting on the star's size. A dying star will leave behind either a White Dwarf-a star with a size smaller than a tennis ball, but with a mass 1030 bigger than the star it came from, a Neutron Star- a star which slowly burns the last remnants of energy left by the star it came from (and it's also neutron charged with all protons and electrons being completely absent, hense it's name) and finally the Black Holes. Our Sun is in the White Dwarf category. When it will die it will leave a White Dwarf behind. Black Holes are not exactly what their name suggests: They are not 'holes' in the emptiness of our universe. Rather, they are objects of sufficiently compact mass which dramaticaly deforms spacetime to create them - those conditions are taking place inside the cores of said dying superstars (because of that, their gravitational amounts is in crazy numbers-we can't even hope to imagine them). Nothing can escape a Black Hole's gravitational pull - not even light. Everything that reaches a Black Hole's Event Horizon will enter the point of no return. It will be instantly sucked by the Black Hole and crushed by the impenting amounts of gravity. Because even light cannot escape it's pull it is very hard to observe a Black Hole, apart from the moment they suck an object. An example of that is the Cygnus X-1 Black Hole, the closest one to Earth and one of the first Black Holes to be discovered. It was discovered through a neighboring superstar that had it's surface tidally distorted by a massive gravitational pull - produced by none other than the close companion of said star...a Black Hole. You can learn more about Cygnus X-1 on Wikipedia, where you will also learn about Cygnus X-1 creating a massive friendly wager between physicists Stephen Hawking and Kip Thorne (a quite funny little aspect of a Black Hole in my opinion ^_^ ). So here you have it Phantom. An introduction to the ellusive mysteries of the Black Holes, one of the most fantastic subjects in astronomy. If you want to dwelve deeper sent a question so that I can use as a guide (right now, if I am to continue talking about them I will be very generally speaking and we don't want that now, do we?). Your opinions and thoughts are much appreciated. :D :D :D |
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| Phantom | Jun 11 2011, 12:57 PM Post #32 |
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Self-proclaimed Sandslash
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Why doesn't anyone know my gender... T.T I kid. I don't blame you, you don't know everyone yet. I'm a girl. Anyway, from the books I read in fifth grade, I remember them saying there was only two possibilities for dying stars - neutron stars or Black Holes. And then the author became paranoid and started ranting on how the sun could turn into a black hole... It was discouraging when my English teacher told me otherwise. Oh the books of grade school... Anyway, a (quick) question for you - what do you think of all the theories about the possibilities of surviving a Black Hole and then discovering something inside? I remember something else about that - the book claimed that there was nothing inside a black hole. Now that I'm a little older, I personally think that the chance of surviving a Black Hole is slim, or perhaps impossible. ...and there's really nothing interesting to discover inside. |
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| Darkceus | Jun 11 2011, 01:41 PM Post #33 |
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Angel
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Actually, a black hole is packed with enormous amounts of matter inside it. The name "black hole" is misleading because "hole" refers to nothing, when really there is huge amounts of matter in it. |
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| Phantom | Jun 11 2011, 06:18 PM Post #34 |
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Self-proclaimed Sandslash
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And is matter interesting? ;P |
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| labouka | Jun 11 2011, 07:49 PM Post #35 |
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Ruler of Black Holes
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What he said. On Phantom's note, there are actually a lot more theories regarding what's inside a Black Hole. And most of them validate that something does exist inside them. I will only list two of the most interesting: the first, revolves around the Black Holes being associated with an existing theory, giving a new form in it, and the second theory is somewhat connected with the first however if not for some tiiiiny technical problems it would be 100% valid. 1st: The Schwarzschild wormhole. The initial theory states that if a person folds-literally-the reality, he can open a hole that will allow him to travel in every corner of the universe in less than a nanosecond. But when Black Holes come into play things become drastically different. The theory considers two Black Holes, one to be the entrance and the other to be the exit, to form said wormhole. And with this wormhole you do not only traverse space, like the original, but also...time. The Hole on the other side can either lead to future or past times (such thing to be accomplished will need a lot of "luck" considering what we previously said about a Black Hole's pull). But it's only going to get better (this one's for you Dark :D ).
Yep, it appears that, as fate would have it, there is more than just matter inside the cores of the Black Holes. And all of the above inadvertently lead us to the next theory... 2nd: The White Holes. Now this concept is in the other side of the coin. Literally. As Black Holes have the tendency to pull everything towards their core, the White Holes ejects mass, light and pretty much everything out of their core and cannot be entered from outside. The White Holes are far more mysterious than their sister Holes simply because they exist only in theory. The concept of the White Holes make the Black Hole-d Schwarzschild wormhole theory a lot more simple (and complicated at the same time :P ) to understand. How? Simply by removing a Black Hole and replacing it with a White Hole. Theoretically traversing through a rotating Black hole, avoiding the singularity, and traveling into a rotating White hole will allow the traveler to escape into another universe. But what's the difference with the above, you will say? The difference lies to the fact that while traveling through a Black Hole-d Schwarzschild wormhole the 'exit' Black Hole will lead you to the past or the future of the 'parent' universe or even the universe created inside the 'entrance' Black Hole. But that's not the case with a White and Black-ed Schwarzschild wormhole as in this theory you are bound to travel to a whole different universe (with no past-future options) and said universe not being the one created inside the core of the initial Black Hole. This theory is basically a one-way road with no means of returning to the 'parent' universe (except of finding a new Black Hole and hope for the best) and it is trully considered one of the most grim speculation regarding the spacetime travel theories. However, as I stated above, a small factor negates the concept of the White Holes completely and so putting a lot of questioning in the above theories: The Second Law Of Thermodynamics!!! The Second Law Of Thermodynamics's principal meaning is the Irreversible process which states that a disordered mass will never spontaneously become a perfect mass once again and regain it's lost energy and heat. That's what the White Holes do. Going through a Black Hole will result in the traversing body to lose energy and have it's mass severely disordrered while it goes through the Black Hole's event horizon. When it will reach the other end which leads to a White Hole, then the disordered mass will become whole again and it's missing energy will be restored, something that is practically and physically IMPOSSIBLE. And not only that but the object will also excperience heat loss that will result in the reduction of it's overall mass (ex. we throw a 100kg watermellon in a Black Hole-White Hole wormhole. Once it will emerge from the White Hole it will weight 70kg. Why? Due to the heat loss from the above actions, the object had a 30kg loss of ot's overall mass, something which is also against the Second Law) meaning that even if it accomplices the previous feat, the traversing object will not be whole. Feeewww...That was one heck of a writing but I definitely enjoyed it. Hope this answers your question Phantom. ^_^ ^_^ ^_^ |
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| Lyna | Jun 12 2011, 09:17 AM Post #36 |
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Warrior
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Did somebody already attempted to go inside a black hole? @_@ |
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| labouka | Jun 12 2011, 11:37 AM Post #37 |
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Ruler of Black Holes
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Nope. No one is that suicudical...Well except for Saturos Icon or Menardi Icon None of us really knows what would happen if we did... Hmmmmmmm...Oh yeah!!! Pretty much something like this... :P Posted Image |
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| Phantom | Jun 12 2011, 05:26 PM Post #38 |
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Self-proclaimed Sandslash
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Oooo, pretty colors. Aww come on, Felix is the only suicidal Adept around here. His record beats anyone's. XD ...From what I remember. |
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| suzumebachi | Jun 12 2011, 05:51 PM Post #39 |
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[post goddess]
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Old post(deleted, was a doublepost): TL;DR lol. I am not much of a planetary/solar system type of girl, sorry!!! Deep space astronomy, yeahh!! anyways. I don't have many questions, there's simply just a lot of stuff I don't know. Like what's an AGN? I know they're related to quasars and that they might possibly be a part of an early stage of galaxies (it stands for active galactic nuclei and is when the center of the galaxy is very active and emits a lot of radiation and crap like that) ... Crap, there's more than one page. whoops! The thing about black holes is that we get all our information about space from light, and light cannot escape a black hole. We can use our knowledge/theories to calculate what might happen, which I think is stuff just generally spiraling into an infinitely massive point, the core of the black hole. I'm trying to remember how they form... Some supermassive star implodes and all the - no, that's a neutron star... derp. Ok anyways, we were talking about this in our Chem class (thanks, Victor, we love you.) ...What's the entropy of a black hole? Don't they act really similar to stuff pertaining to atomic physics? Edited by suzumebachi, Jun 12 2011, 05:52 PM.
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| Phimi | Jun 12 2011, 05:52 PM Post #40 |
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Mehz.
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Actually, it is theoretically possible to survive inside the event horizon of a black hole. Rotating black holes have two event horizons, the outer, gravitational one, which has been described above, and an inner, rotational horizon, which acts similar, but in reverse. In a rotating black hole, matter would be pulled inward, and slightly sidewards, just like satellites around the earth, and as you go further in, the sidewards force overcomes the inward force, and you can no longer go further in. The faster the black hole is rotating, the further from the central singularity this event horizon is. If you can find a black hole whose mass gives a gravitational event horizon of a distance, let's call it x, and a rotational event horizon AT THE SAME distance, the two would cancel each other out, and the singularity would no longer be hidden by it's event horizon, and is thus called a naked singularity. The fun starts as no known theory works around such large concentrations of matter, so a naked singularity, for all we know, could start radiating pink elephants, as we can make no reliable predictions about what happens around one. |
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| Phimi | Jun 12 2011, 05:56 PM Post #41 |
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Mehz.
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Active Galactic Nuclei are simply the supermassive black holes which are accreting matter into them. The black hole at the centre of our galaxy is dormant, to say, as the energy released from previous infalling matter has been sufficient to keep all other matter at bay, whereas in AGN's, they're being observed at such an early time in their "life" that the matter surrounding them (the galaxy) is actually falling into the black hole. |
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| suzumebachi | Jun 12 2011, 05:56 PM Post #42 |
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[post goddess]
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LOL, but what's the chances of finding one of that.. or at least, any time soon. I'm sure one exists like that somewhere in the galaxy, seeing that we rely on chance so much (and believe that there's intelligent life elsewhere in it because... what's the chances of us being the only ones? :P) |
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| Phimi | Jun 12 2011, 05:58 PM Post #43 |
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Mehz.
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Got to start reading entire posts, the entropy of a black hole depends on it's mass, but is generally huge, showing black holes are some of the most disordered objects in the universe. |
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| Phimi | Jun 12 2011, 06:01 PM Post #44 |
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Mehz.
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It's of course as unlikely as the earth radiating pink elephants as a naked singularity, just we haven't found one yet to observe, and relativity and quantum mechanics refuse to play nicely together around a singularity, so, right now, it's perfectly valid to say that they do, as you can't be proven wrong. |
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| Phimi | Jun 12 2011, 07:26 PM Post #45 |
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Mehz.
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Oh, one more thing, Labouka, a white dwarf isn't a star the size of a tennis ball, as ANY star the size of a tennis ball would be a black hole. A white dwarf is incredibly shrunken, but, for example the sun, will be about the size of earth. If you wanted to know, I did some number crunching and the sun would have to crushed to a sphere with a radius of about 2 kilometres before it became a black hole. The earth would have to be about the size of a pea. |
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