Blackholes Definition and 72 Threads

I read somewhere "space was not completely homogenous (the same at every point). Instead, some areas were denser and hotter than others, and these dense regions could have collapsed into black holes." and I was wondering what does it exactly means? Did space itself fall into becoming PBHs...

I have heard from, many attractive looking physicists on Youtube, that if I fell into a black hole, as I fell, I'd be stretched out or be "spaghettified. Is this correct? It seems to me that gravity compresses the free space, and that means, any object near a black hole should be compressed. If...

First off, this is just an assumption. My knowledge of the field is extremely limited and I beg you to come and correct my mistakes, so I can learn. So, I guess we all know how that space-time fabric is bended by gravity. When a star dies, all of the atoms are brought extremely close...

Hi, I am new here. A while back I read articles about observations of supermassive black holes in the early age of the universe. What are the hypotheses that would explain how these black holes grew so large and so fast so soon? Could inflation play a role here? Like how inflation would be able...

If you fall into a black hole, that what is closer to the singularity, will fall faster that than what is further. However, space before and after you, is falling in with you. So from each General Relativistic perspective of "you", because there would be no inertial frame to orient yourself (you...

I've recently read a new article that said that the recent gravitational waves might have had 2 black holes in a star that gave me a question, because you need masses to move or accelerate to generate gravitational waves, what happens to the mass inside of the star? because black holes's space...

If black holes were able to stop light from escaping , then would it mean that photons do have a certain mass (no matter how much negligible it is ) and if it does then how can something that has mass (photons) travel at the speed of light. wouldn't the speed limit aplly to them too?

So around the time of the Big Bang, Particle and antiparticle pairs were created and annihilated. I believe one out of every 100 million(?) particle pairs actually didn't have an accompanying antiparticle, and survived the maelstrom, giving us the galaxies and stars we have today. Now, at the...

Do black holes have gravity less than their mother star?.if no then why not,though during formation of black holes outer layer of star explodes out in space and inner core crush by its own gravity this way its mass decrease..So If i consider Gravity a force,by Newton law of gravitation Decrease...

Well read a post long ago about light My questions are: If light has no mass then how can it be suck in a black hole? What exactly is redshifting? What do polarizing glasses do?

Scientists had long thought that black holes were the only sources for ULXs. As black holes consume nearby material, they emit powerful X-rays thought to be responsible for the extremely bright ULX objects. http://www.space.com/27385-pulsar-discovery-superbright-xray-beacon.html A few...

Hey all, This is a just for fun question, as I am sure there is no definitive correct answer. But here it goes Blackholes to my knowledge, generate the strongest gravitational fields in the known universe. While thinking about gravitational time dilation, and the sheer magnitude that black...

I was wondering if we decided that black holes are dense due to the spin and gravity? Are there any other factors for determining density? And could those factors also be true if a black hole were simply a vortex- like a drain per se. A drain that shoots out in two opposite directions, that...

I just registered and am not entirely sure this is the right section of the forum to ask, but regardless... My understanding of gravity is that it is a wavelike distortion in spacetime which travels not instantaneously but at the speed of light, and may also be describable in terms of a stream...

Sorry if my questions are rather naive, this is my first post on this forum. Whilst burshing my teeth, I was watching water drain from the sink and came up with a few rather curious questions. Does the ingest of matter suggest by black holes suggest that the pressure of our universe is...

An amount of material I have read recently refers (specifically) to the spherical case of black holes. Are there non-spherical black holes? Regards, Noel.

Many scientist have actually wondered what scientific discoveries await from the beginning of a wormhole to the bitter end on the other side. But what exactly can be waiting on the other side at the very end of that dark abyss? What do we truly know about the deep regions of space and time...

This is from Hawking's Brief History of Time: I don't see why the black hole is cut off from the rest of the universe. The black hole is still there and it's still made of ordinary matter, just a more dense than other matter. Is it because time stops in a black hole? Or that nothing can...

this passage is from Paul Davies' the Last Three Minutes: I have a very difficult time believing and understanding this. Why would two quarks being in close proximity create a black hole? A nucleus is only 3 orders of magnitude larger than a quark which i like mount everest compared to a...

I have a question about the formation of black holes. Correct me if I am wrong but as I understand it, if you have a massive enough star that when its used up all its fuel and collapses, it will overcome the exclusion principle and crush itself into a black hole. My question is, during this...

What would happen to the spacetime fabric when two super massive black holes collide. I know that they would orbit each other and the would produce gravitational waves.

There are two representations of black holes that I see in the popular media. Could you help me find the answer to a (or two) question about this please? 1. Feeding black hole with an accretion disk - I assume that the accretion disk is a product / consequence of rotation (in addition to the...

I read in an article (lecture) by Stephen Hawking that very minute black holes keep on appearing and disappearing in empty space. Would anyone like to explain this?

Hi guys, can't find a post similar to this so ill ask; What does a black hole look like from behind? The spatial apperance is similar to a heavy object sitting on a taught towel or sheet (due to its large mass affecting space-time), but what does an observer on the singularity side (further...

I recall reading about creating a black hole from having an area of space-time occupied by a sufficiently high enough number of high-energy photons, so as to create a black hole. I believe this has some German name, but I can't recall it at the moment. Does anybody have an opinion on this...

Again, there is a bad word, ignore it. Yes, he appears not to know about the affect of different altitudes/pressures on the boiling point of water, but he's a philosopher, not a scientist. He still makes good points...

In science books I always have read that supper massive black holes explode in a supernova once they run out of fuel. After that the core of the star collapses and forms a black hole. But are there other ways in which black holes are formed in nature, besides the the core of a big star...

Hello, I've been wondering about a few things, I hope you can answer my questions. Question A. If you look at a black hole that has something behind it, say a nebula in our example, what does the black hole look like? Would it be a completely black spot in the middle of the nebula...

From what I understand a black hole is the result of a tremendous amount of matter being pulled together to a finite point in space and this point creates some kinds of a dip in space. Please correct me if I am wrong? Questions.. How big can a black hole get? I've heard something about...

I was watching a show on TV about physics and a question popped into my head that I can't find an answer to. I remember hearing it may be possible to create tiny black holes in the LHC, so maybe you can test this, I don't know. Here is my question... What would happen if you took two entangled...

If you could safely stand inside a black hole about the size of a small room, filled it with smoke, and shined a laser - would you see the light not only bend towards the warping gravitational field but also blueshift? My previous post was removed so if you responded I didn't get it. I guess...

Im trying to come up with a sort of diagram you could call it, of a black hole and all its "parts" for example i know there's the event horizon, ergosphere, the jets that come out of the poles. And any other helpful info. about black holes and there classification, like there's rotating ones...

I'm sure this is a stupid and/or already asked question. But I don't do astronomy. If every galaxy has a black hole, and black holes suck everything in, does this mean that our galaxy is being slowly destroyed by black holes? (Everything just keeps getting sucked in) And if so, are we going to...

Hello, I was watching a show on one of DirectTV's Science channels last night about supermassive black holes. They stated the these supermassive black holes exist in two phases : 1. When they are sucking in everything around them (stars, planets, moons, etc). 2. When they aren't sucking in...

Hello, I have a question, since light has no mass how can it be sucked by a black hole, doesn't anything with no mass have zero weight (W=mg), or are photons somehow attracted to black holes?

Would it not be possible for many black holes to form in the beginning stages of the universe since the universe was very dense? Can that be the cause of the so called "Dark Energy" or "Dark Matter"?

"God works on mysterious ways, which we don't understand" - a usual answer I hear from theists when asked about some contradictions. As per the current Physics, "Inside a black hole, every existing physics theory breaks." What's the difference between these two statements? Does god...

if a black hole absorbs mass and makes it disappear from this universe. Where is the missing energy from that mass in the universe, considering that the total energy is a constant. Could it be white holes the answer?

please forgive my ignorance but, i was watching somthing in tv the other day about supermasive black holes, now my question is, if some black holes are more massive than others, how can their mass be infinite? if Blackhole A is more massive than black hole B then surly they can't both be...

my theory of black holes, and the start of the universe, ok ,all black holes go to central point of mass, all the central points of all the black holes combine to converge to a parallel universe, which takes the mass from our universe, to start the "big bang", when enough mass has been forced...

It is stated that nothing can escape a black hole and they are gigantic and powerful enough to rotate a galaxy. The gravitational force of space acting on the black hole is immense. On this level of gravity could time it self be stopped in the black hole? Therefore the amount of mass taken by...

Is it possible to deduce that a black hole must have something akin to Hawking radiation due to the 2nd Law of Thermodynamics? Let us consider for now a purely classical black hole. The event horizon is effectively a 'light diode' in that if light can pass through in a particular direction...

Consider the Schwarzschild black hole vacuum solution. Now let a test particle drop from "coordinate rest" at a finite r, and watch it fall in. Is there a coordinate transformation in which we go to a rotating frame where the black hole is now a Kerr black hole and the test particle follows...

Ok so i don't know squat about either subject, so blame Nova for this post. The show was talking about reaching absolute zero and einstine's conensate theory. As they talked about using intense magnetic fields and shot light waves through these near zero gas clouds causing light to slow. one...

Now correct me if I'm wrong. Gravitational singularity is when It has a defined mass but no volume and the equation for density is d=m/v. If a black hole's mass is say 10^40 yottagrams and its a singularity so it has no volume = 0. How can it have infinite density if the equation is (10^40...

So, according to stuff i have read over the past few days (quite interesting stuff out there) there is a "supermassive black hole" at the center of our universe. what i would actually like to know is if this had the supposed mass it does which if i am correct with my memory was something along...

First question: Since a neutral Higgs boson is its own anti-particle, and has zero spin, it appears to have zero for all quantum numbers (in the standard model). This is what one would expect as well for the smallest neutral black hole with no angular momentum. What "new" quantum numbers...

this topic relates to my post in a threat relating to GLAST https://www.physicsforums.com/showthread.php?t=240620 Super massive black holes eject jets of matter back out into space. The matter in these jets shoot out of the black hole at 99% the speed of light. However the escape velocity...

I suspect that the runtime simulation for a star systems containing thousands of stars , many of those stars whose mass is way beyond the solar mass to be very very long. Is it possible and cost-friendly(i.e, not expensive) to simulate a globular star system cluster over a supermassive black...

What are miniature black holes at a quantum level? What does string theory say?