BlackHoles

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onetrakmindz

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Blackholes have this incredible gravity field that even light cannot escape. So how is it they can eject or emit anything? Electromagnetic particles are affected by gravity, but other particles like x-rays, radiowaves are not?
 
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docm

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Hawking radiation....<br /><br /><blockquote><font class="small">In reply to:</font><hr /><p>><br />Hawking radiation allows black holes to lose mass, black holes which lose more matter than they gain through other means are expected to evaporate, and shrink, and ultimately vanish. Smaller 'micro' black holes are currently predicted by theory to be larger net emitters of radiation than larger black holes, and to shrink and evaporate faster.<br /> /><p><hr /></p></p></blockquote><br /><br />Black holes make life possible?....<br /><br /> <div class="Discussion_UserSignature"> </div>
 
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why06

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x-rays and radio waves are frequencies of the Electromagnetic spectrum and are affected the same as light and all particles or waves carrying information and of the spectrum. They can not escape a black hole once within the event horizon. Nothing can. I believe Hawking readiation occurs only because of the randomness of the Quantum level. <div class="Discussion_UserSignature"> <div>________________________________________ <br /></div><div><ul><li><font color="#008000"><em>your move...</em></font></li></ul></div> </div>
 
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kyle_baron

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<font color="yellow"><br />Blackholes have this incredible gravity field that even light cannot escape. So how is it they can eject or emit anything? </font><br /><br />In a nutshell, blackholes emit radiation (X-rays) from the event horizon, where strong magnetic fields are formed. This is far enough away from the singularity, where everything ends. <div class="Discussion_UserSignature"> <p><font size="4"><strong></strong></font></p> </div>
 
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derekmcd

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I believe you may be referring to x-ray jets being emitted from the accretion disc. I don't believe these have anything to do with Hawking radiation. <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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heyscottie

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onetrakmindz:<br /><br />You are right -- the gravity of a black hole is so strong, nothing can escape. Others mentioned Hawking Radiation, which seems to be a true effect, but it is very small, and deals in quantum mechanics.<br /><br />I suspect you are talking about how we see x-ray blasts or jets from black holes. Well, we don't. We see x-ray blasts and jets from NEAR black holes. As gas falls into a black hole, it is compressed and accelerated so greatly that it heats up to incredible temperatures. This causes it to emit x-rays. But once the gas has actually gotten past the event horizon, we don't see ANYTHING any more from it.<br /><br />So we are only seeing the effects the black hole has on its neighborhood.
 
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alokmohan

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Even at the event horizon you may see accretion disc.Once you cross past event horizon you cannot see.Event horizon is the limit.
 
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keshe

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There is an interesting question to ask regarding all suggestions above.<br /><br />The question is <br /><br />Do all black holes absorb only one type of rays ?<br />Or different black holes absorb different rays depending up on their internal gravitational field strength?<br /><br />In either case diffrent black holes must posses different gravitational field strength, and does this mean the direction of approach to them dictates the leakage or absorption of the matter or the ray.
 
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weeman

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<font color="yellow"> Do all black holes absorb only one type of rays ? <br />Or different black holes absorb different rays depending up on their internal gravitational field strength? </font><br /><br />Black holes absorb all types of rays and wavelengths within the electromagnetic spectrum. Since all the wavelengths of the spectrum (x-ray, infrared, visible, radio, etc.) travel at the speed of light, nothing can escape the pull of a black hole. <br /><br />The escape velocity of all black holes once you cross the event horizon is equal to the speed of light, their varying sizes do not matter. <br /><br />The only way that the varying masses of black holes might make a difference is if you're anywhere outside of the event horizon. Once inside the horizon, nothing matters anyways because everything that enters is doomed. <br /><br /> <div class="Discussion_UserSignature"> <p> </p><p><strong><font color="#ff0000">Techies: We do it in the dark. </font></strong></p><p><font color="#0000ff"><strong>"Put your hand on a stove for a minute and it seems like an hour. Sit with that special girl for an hour and it seems like a minute. That's relativity.</strong><strong>" -Albert Einstein </strong></font></p> </div>
 
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CalliArcale

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<blockquote><font class="small">In reply to:</font><hr /><p>In either case diffrent black holes must posses different gravitational field strength, and does this mean the direction of approach to them dictates the leakage or absorption of the matter or the ray.<p><hr /></p></p></blockquote><br /><br />Others have already touched on the fact that once inside the event horizon, it's all irrelevant, so I'll touch on the different gravitational field strength question.<br /><br />Yes, different black holes do have different gravitational field strengths! This does not affect what kind of radiation they absorb; what it affects is the size of the event horizon. The more massive the black hole, the wider the event horizon. This is because gravity and mass are directly related. A black hole formed by the collapse of a star will have a mass many times that of our Sun. The supermassive black hole at the center of the Milky Way is vastly more massive. But you can even have small black holes. A black hole the size of the Earth would have a very small event horizon. I once posed a question here about a black hole with a mass of one kilogram. I suspect that such a tiny black hole would be able to pass directly through the planet without actually hitting any matter because it would be so miniscule. But I don't know the math required to figure it out.<br /><br />Black holes are often thought of as monstrously huge objects, but actually they don't have to be huge. What makes something a black hole is *density*. If the mass is compressed into a sufficiently small space, there will be an average orbital altitude about the object such that escape velocity is c. But if the object is not very massive, then that altitude is going to be so close to the object that it might be able to pass directly through another atom!<br /><br />Weird but true. That's the sort of black hole that physicists talk about possibly creating in the lab. Such a black hole is far too minuscule to be any kind of a threa <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em>  -- The Tenth Doctor, "Blink"</font></p> </div>
 
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alokmohan

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Idea of monstrous black hole floats.You have broken the myth good.
 
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ianke

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Hi CalliArcale,<br /><br />Check these papers out.<br /><br />Is there a Black Hole Minimum Mass? by Tomohiro Harada (Google)<br /><br />Black Hole Electron on Wikipedia<br /><br />I have to find the others but those will get you started <div class="Discussion_UserSignature"> </div>
 
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bckalt

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<p>As I approach the event horizon of a black hole, my spaceship and I are ripped to shreds by tidal forces, and the shreds become part of an accretion disk whose components are orbiting the black hole at almost the speed of light. The components on the innermost edge of the disk migrate inward, crossing the event horizon. </p><p>My question is, how big are the components just before they cross? Molecules...atoms...sub-atomic particles...quarks?&nbsp; </p>
 
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derekmcd

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<p><strong><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>"As I approach the event horizon of a black hole, my spaceship and I are ripped to shreds by tidal forces"...</strong></p><p><strong>&nbsp; <br /> Posted by bckalt</DIV></strong></p><p>&nbsp;</p><p>This isn't always true.&nbsp; It depends on the size (schwarzschild radiu) of the black hole.&nbsp; Spaghettification doesn't happen unitl the gravitational gradient is sufficiently strong enough to accelerate you feet faster than your head.</p><p>In the case of the supermassive black hole, the Event Horizon is far enough away from the singularity, you might feel nothing unusual as you pass the event horizon.&nbsp;</p><p>&nbsp;</p><p><strong>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>"My question is, how big are the components just before they cross? Molecules...atoms...sub-atomic particles...quarks?"</strong></p><p><strong>&nbsp; <br /> Posted by bckalt</DIV></strong> </p><p>&nbsp;</p><p>Again... depends on the size of the black hole.&nbsp; I believe the accretion disks around most stellar sized black holes are in the form of an ionized gas.&nbsp; </p><p>What happens to this matter as it approaches the singularity?&nbsp; Likely broken down into quarks and leptons.&nbsp; After that, it is beyond what GR can answer.&nbsp; What happens beyond the event horizon is pure speculation as it can never be observed.</p> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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Mee_n_Mac

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>&nbsp;<em>This isn't always true.&nbsp; It depends on the size (schwarzschild radiu) of the black hole.&nbsp; Spaghettification doesn't happen unitl the gravitational gradient is sufficiently strong enough to accelerate you feet faster than your head.In the case of the supermassive black hole, the Event Horizon is far enough away from the singularity, you might feel nothing unusual as you pass the event horizon.&nbsp;&nbsp;&nbsp;&nbsp;Posted by <strong>derekmcd</strong></DIV></em></p><p>Care to comment on k_b's rebuttal that appears in this thread?&nbsp; I've heard what you've said above but never gave it any critical thought until lately. Do we "spaghettifi" immediately inside the event horizon on a SMBH ?</p> <div class="Discussion_UserSignature"> <p>-----------------------------------------------------</p><p><font color="#ff0000">Ask not what your Forum Software can do do on you,</font></p><p><font color="#ff0000">Ask it to, please for the love of all that's Holy, <strong>STOP</strong> !</font></p> </div>
 
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Rhiannann

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<p>I had a question, well I have many, I've always been fascinated with black holes. I had an idea that they could send two probes out to the nearest black hole. One probe would stay a safe distance and film the other going beyond the event horizon.&nbsp; The one going to its doom could film all it could before it was destroyed.&nbsp; I've read that nothing can be transmitted from that point so maybe my idea wouldn't work.</p><p>Or maybe this......since there is an acretion disk, go above it. From the area where the jets usually stream out on the axis.&nbsp; Would that work?</p>
 
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derekmcd

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<p><strong><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>"Care to comment on k_b's rebuttal that appears in this thread?"</strong></p><p><strong> Posted by mee_n_mac</DIV></strong></p><p>&nbsp;</p><p>Not sure what rebuttal you are talking about as we can no longer link to specific posts.&nbsp; I will give that thread a re-read.&nbsp;</p><p>&nbsp;<br /><strong>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>"Do we "spaghettifi" immediately inside the event horizon on a SMBH ?"</strong></p><p><strong>Posted by mee_n_mac</DIV></strong> </p><p>&nbsp;</p><p>I'm sure you are familiar with the inverse square law in that the strength of gravity is proportion to the distance.&nbsp; Double the distance, 1/4 the strengh... triple the distance, 1/9 the strength.</p><p>Even here on Earth, there is a difference in the strenght of gravity between your head and feet, but the gravitational gradient between the two are so small that the effects are negligible.</p><p>Shrink the Earth down to it's Schwarzschild radius of 9mm, but you remain the same distance you are standing now, there will be no change.&nbsp; As you slowly approach that 9mm sized earth, your feet will feel the forces of the gravitation increase before your head.</p><p>The closer you get, the gravitational gradient based on the inverse square law will become more and more pronounced to the point that your feet will be accelerated towards the center of gravity faster than your head... hence the term "spaghettification".</p><p>As for supermassive black holes, no... it does not happen instantly.&nbsp; It is actually dependent on how rapidly you are approaching the center of mass (singularity).&nbsp; If you are in a slowly decaying orbit, this could be a very long process.&nbsp;</p> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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derekmcd

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<p><strong><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>"I had a question, well I have many, I've always been fascinated with black holes."</strong></p><p><strong> Posted by Rhiannann</DIV></strong></p><p>&nbsp;</p><p>Fascinating, they are.&nbsp; They still hold many unanswered questions.&nbsp;</p><p>&nbsp;</p><p><strong>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>"I had an idea that they could send two probes out to the nearest black hole. One probe would stay a safe distance and film the other going beyond the event horizon.&nbsp; The one going to its doom could film all it could before it was destroyed.&nbsp; I've read that nothing can be transmitted from that point so maybe my idea wouldn't work."</strong></p><p><strong> Posted by Rhiannann</DIV></strong></p><p>&nbsp;</p><p>One probe filming the other would end up becoming a painfully slow process as the probe filming approached the event horizon.&nbsp; Gravitational time dilation would make the filming probe appear to continuously slow down to the observing probe.</p><p>You are correct... when the filming probe passes the event horizon, the observing probe could no longer recieve signals from it.</p><p>&nbsp;</p><p><strong>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>"Or maybe this......since there is an acretion disk, go above it. From the area where the jets usually stream out on the axis.&nbsp; Would that work?"</strong></p><p><strong>Posted by Rhiannann</DIV></strong> </p><p>&nbsp;</p><p>Not sure what you're asking here.&nbsp; It's rather unlikely that any space probe's instruments could stand up to the copious amount of radiation being doled out by an accreation disk. </p> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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pradipta

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Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Blackholes have this incredible gravity field that even light cannot escape. So how is it they can eject or emit anything? Electromagnetic particles are affected by gravity, but other particles like x-rays, radiowaves are not? <br />Posted by onetrakmindz</DIV><br /><p style="margin:0in0in0pt" class="MsoNormal"><font face="Times New Roman" size="3">I do not believe on black whole because it is creation of space mirror. From the ancestral time the world space research established on blind theory. We although demand that we have discovered lots of mysteries viz. milk ways, galaxies, nebulas, white drafts, black holes etc., in real they are creation of space mirror. SPACE MIRROR is the truth and hidden mystery of the space. Since we are unknown about space mirror, our research has diverted from original truth and we have spent lots of time and money behind the false truth. </font></p><p style="margin:0in0in0pt" class="MsoNormal"><font face="Times New Roman" size="3">Therefore it invites to visit </font><font face="Times New Roman" size="3">http://www.spacemirrormystery.com</font><font face="Times New Roman" size="3"> and for prosperous space research. </font></p><span style="font-size:12pt;font-family:'TimesNewRoman'"><br /></span> <div class="Discussion_UserSignature"> <p>pradipta</p> </div>
 
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majornature

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Correct me if I'm wrong but I thought Black hole have jets of energy shooting outward due primarily to the fact that most of the energy that the black hole consumes never "falls" into the horizon.&nbsp; Thus a black hole consumes a lot of light; so fast, that most of the light doesn't get trapped and is shot out into space....<img src="http://sitelife.space.com/ver1.0/content/scripts/tinymce/plugins/emotions/images/smiley-yell.gif" border="0" alt="Yell" title="Yell" /> <div class="Discussion_UserSignature"> <font size="2" color="#14ea50"><strong><font size="1">We are born.  We live.  We experiment.  We rot.  We die.  and the whole process starts all over again!  Imagine That!</font><br /><br /><br /><img id="6e5c6b4c-0657-47dd-9476-1fbb47938264" style="width:176px;height:247px" src="http://sitelife.space.com/ver1.0/Content/images/store/14/4/6e5c6b4c-0657-47dd-9476-1fbb47938264.Large.jpg" alt="blog post photo" width="276" height="440" /><br /></strong></font> </div>
 
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pradipta

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Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Blackholes have this incredible gravity field that even light cannot escape. So how is it they can eject or emit anything? Electromagnetic particles are affected by gravity, but other particles like x-rays, radiowaves are not? <br />Posted by onetrakmindz</DIV><br /><br /><p style="margin:0in0in0pt" class="MsoNormal"><font face="Times New Roman" size="3">I do not believe on black whole because it is creation of space mirror. From the ancestral time the world space research established on blind theory. We although demand that we have discovered lots of mysteries viz. milk ways, galaxies, nebulas, white drafts, black holes etc., in real they are creation of space mirror. SPACE MIRROR is the truth and hidden mystery of the space. Since we are unknown about space mirror, our research has diverted from original truth and we have spent lots of time and money behind the false truth. </font></p><p style="margin:0in0in0pt" class="MsoNormal"><font face="Times New Roman" size="3">Therefore it invites to visit </font><font face="Times New Roman" size="3">http://www.spacemirrormystery.com</font><font face="Times New Roman" size="3"> and for prosperous space research. </font></p> <div class="Discussion_UserSignature"> <p>pradipta</p> </div>
 
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derekmcd

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Correct me if I'm wrong but I thought Black hole have jets of energy shooting outward due primarily to the fact that most of the energy that the black hole consumes never "falls" into the horizon.&nbsp; Thus a black hole consumes a lot of light; so fast, that most of the light doesn't get trapped and is shot out into space.... <br /> Posted by majornature</DIV></p><p>&nbsp;</p><p>Plasma jets from black holes are understood only in that physicists know <strong><em>what</em></strong> they are, but are stilll studying and modeling the mechanics of <em><strong>how</strong></em> they work.</p><p>The 'what' is an accretion disk of infalling matter that is accelerated and superheated ionizing the matter into a plasma state.&nbsp; The ionized matter is energized enough to escape before it falls past the event horizon and is observed in the xray spectrum.</p><p>How it finds a path to the polar axis is still being worked out.&nbsp; Likely, it deals with the accretion disk and/or the rotating black hole creating a magnet field that somehow guides the plasma towards the magnetic polar axis of the system. </p> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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pradipta

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Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>&nbsp;Plasma jets from black holes are understood only in that physicists know what they are, but are stilll studying and modeling the mechanics of how they work.The 'what' is an accretion disk of infalling matter that is accelerated and superheated ionizing the matter into a plasma state.&nbsp; The ionized matter is energized enough to escape before it falls past the event horizon and is observed in the xray spectrum.How it finds a path to the polar axis is still being worked out.&nbsp; Likely, it deals with the accretion disk and/or the rotating black hole creating a magnet field that somehow guides the plasma towards the magnetic polar axis of the system. <br />Posted by derekmcd</DIV><br /><p style="margin:0in0in0pt" class="MsoNormal"><font face="Times New Roman" size="3">I do not believe on black whole because it is creation of space mirror. From the ancestral time the world space research established on blind theory. We although demand that we have discovered lots of mysteries viz. milk ways, galaxies, nebulas, white drafts, black holes etc., in real they are creation of space mirror. SPACE MIRROR is the truth and hidden mystery of the space. Since we are unknown about space mirror, our research has diverted from original truth and we have spent lots of time and money behind the false truth. </font></p><p style="margin:0in0in0pt" class="MsoNormal"><font face="Times New Roman" size="3">Therefore it invites to visit </font><font face="Times New Roman" size="3">http://www.spacemirrormystery.com</font><font face="Times New Roman" size="3"> and for prosperous space research. </font></p> <div class="Discussion_UserSignature"> <p>pradipta</p> </div>
 
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