Holes Definition and 1000 Threads

I understand that there may be no answer to the question "Why is Pauli Exclusion Principle not applied beyond a Neutron Star's mass?" since there may not be a full quantum gravity theory yet, however, I'm thinking, what if Pauli Exclusion Principle is not really a principle, but an indication...

I need to know when did the first black holes appear?

I read that the speed of light is constant, that everyone measures the same speed of light from their own reference frame. Yet I have also read that light can't escape from a black hole, because of the gravitational effects. How can you measure it's speed at 'c' and yet at the same time not...

Hey guys, I'm a new guy in this forum. I've been visiting it for 1 year actually but never decided to register and so I did. I am having a presentation on black holes at school and I want some clariffication of what's going on when falling into a black hole. Well let's assume that an...

Hello Forum, in semiconductors, there are two types of charge carriers: electrons and holes. Holes are fictitious positive charges...How can they have a mass? thanks, fisico30

1. Photons approaching a black hole will initially a. all of the above are possible depending on distance from the event horizon b. pass by with their direction changing (bending/curving) c. fall into the black hole d. go into orbit around the black hole e. pass by without...

Hello, Let me first start off by saying that I have no formal Education or background in Physics or Astronomy save for one course during college. This is simply posing an idea I had while reading an article on the acceleration of the expanding universe and how it could have a correlation with...

hi, i was wondering, for a black hole, as everyone knows,the escape velocity is greater than light. this means that the information about the existence of the black hole in terms of light never reaches the observer. so if the black hole were the cease to exist at an instant of time, the...

My question is this: Does the direction of spin of a supermassive black hole exert an affect on the spin of its surrounding galaxy (given that the above described black hole is at the center of such a galaxy)? Is there a direct or correlative effect? If so, can an in-depth explanation be...

Hey everyone, I have some questions about quantum physics and black holes. For starters, what happens to an entangled particle as it enters a super massive black hole? Would gravity just break the entangled state because of the extreme forces? The only issue i see with that is that...

Hi, I am working on a design that has a stack of CSK PC/104 pcb boards fastened togther using HEX spacers. One of the PCB boards is being designed by an different design team. They have already manufactured their board but it turns out that the screw holes for the Hex spacers are...

Suppose two black holes graze one another in a high speed encounter. The collision is glancing such that the event horizons merge and then separate. Q1) I assume this is possible? Now suppose that the collision is nearly but not completely collinear. Q2) Is it true in this case that...

Please correct me if I am wrong, as I have little more than a high school knowledge of physics until I start at university this year - virtually no knowledge of the quantum side of things just yet. ^^ My thought is, as spaghetification occurs as you approach the centre (not using singularity...

I read in a book that since the area of a black hole increases, the entropy increases, so black holes are consistent w/ the second law of thermodynamics. So...I have a really stupid question on black holes and the second law of thermodynamics: Consider an ideal gas of non-interacting...

I know that black holes are still not entirely understood, but I do know that it's generally accepted that they emit Hawking radiation. But I've also heard that the gravitational pull of a black hole is so strong that nothing can escape, "not even light". So how is it possible that Hawking...

I have to write a research paper on a topic of my choice for physics class, I chose black holes simply because they interest me and it was one of the few topics unchosen. Can anyone with more scientific intellect then myself provide some insight as to how black holes relate to physics? Just some...

To my understanding, as an object approaches the event horizon of a black hole, the light that is seen by a relatively static observer slows down more and more until the light is eventually "trapped" on the event horizon, making it appear to the observer as though the object is standing still...

It is well-known that associated with the Kerr solution which represents a rotating black hole, there can be a region of space-time where there are loops in space time (non simply connected paths which are navigable in principle). If this is so, it breaks causality and permits time travel in...

Hi everyone. I have a very keen interest in physics. Unfortunately at school I was made to do a combined qualification in science which didn't allow me to pursue what I was interested in most. I still try and read and understand what I can about physics and cosmology... but one thing has...

Simple enough question. I know there are two types of black holes; the type formed after a star collapses in a supernova and the supermassive variety like the one at the center of the milky way. If a star continued to grow by swallowing up other stars and solar systems is it possible that at a...

Hawking and others suggest that it is a very special deal that macroscopic black holes lose quantum information, but I only partially agree. It is clearly important that they do not preserve most quantum numbers - black holes may be a way to break a lot of conservation laws of particle physics...

I think we're all familliar with the old "What if you fell into a black hole?" Event horizons, time dilation (I think is the right term), and spagettification. There is however one thing these thought experiments never seem to cover that I'm really curious about. As I understand this...

Hi everyone I have a question that has been bothering me for a while now. I have basically built a Faraday cage using wire mesh. I know there is a relationship between the mesh hole size and the wave suppressing ability of the cage. As I understand it an electromagnetic wave can be thought of...

If neutrinos can move faster than light speed, then can they escape from a black hole? If so, then would the life of a black hole be reduced?

http://whoknew.news.yahoo.com/who-knew/black-holes-27425876.html

Hello! I just want to start off by saying that I am no physicist or astronomer, so my apologies if my questions are really basic lol (although I am an engineer so I do have some technical background). I am very interested in it though, and I had some questions that I was hoping someone could...

Am I correct in saying that in theory Time, Matter and presumably Energy are compressed to a singularity at the centre of a black hole? If that is so then wouldn't they be "transported" back to the state and position they were in at the very beginning of time. In other words the instant of...

Talking about the big bounce and black holes in another thread made me wonder about the life span of black holes, especially in the heat death scenario. If the U went through heat death, does that mean that black holes would also exhaust their energy? Do black holes die, and if so, what...

It is my understanding that time within black holes is slowed down incredibly, and all of the mass is found within this slowed down area. How then could a black hole move if time is slowed down so much (possibly infinitely)? Shouldn't this slowing of time also reduce the speeds of the mass...

Can the amount of space/time warped by a black hole be measured and if so, where can I find measurements of previously measured black holes?

As I currently understand it from the point of view of an observer falling into a black hole it takes a finite time to cross the event horizon and reach the singularity. From the point of view of a far away observer the person falling into the black hole never actually crosses the event horizon...

A thought experiment I have been thinking about this for twenty years and I would like to hear your opinions. It relates to black holes, dark matter, the expansion of the universe, and unifying theories. This is very simple and beautiful to me. Forgive my lack of formal training, my goal...

Hello, I'll try to explain this as well as I can... I was watching NOVA's special on The Fabric of the Cosmos and the segment on how information is both lost in the black hole and stored on the surface got me wondering "Is there a limit to how much information can be stored on the surface...

I don't like the idea of anything crossing the event horizon of a black hole from any observer's view point. The closer something gets to the event horizon, it either appears to slow down, or the event horizon appears to stretch and move further away. How can anything cross it? For this...

If gravity is a distortion between space and time, then how come black holes are formed, only the surface of an object should then exert gravity, right?

what happens when two black holes collide?

what is the difference between a neutron star and a black hole?

Has anyone figured out or tried this: It seems to me that since light is bent by G fields, that looking close enough to the side of a black hole, some of that light near the event horizon may have escaped its G field after its trajectory has changed significantly... possibly redirected enough...

Can anyone point me to a journal article that describes, mathematically or otherwise, how those jets shoot from the poles of some black holes with accretion discs and AGN. Also, if you will forgive the additional question, is there any reason why the physics that describe the ejection from...

Hi. So, as title says, how can black holes radiate if nothing can escape from them?

Please Help! I'm writing a novel involving worm holes and asteroids/meteors I thought it would be best to ask the experts in the field to make sure I don't get lynched when this book comes out. Please help however you can. The date during this particular incident is Feb 14, 2016, 11:47 pm...

Suppose there exists a black hole with a large + electrical charge. The escape velocity for any given particle will depend on the net force on it, gravitational + electrical. It seems logical that the more positive a particles charge the lower its escape velocity will be from any given point. If...

Homework Statement Find the oblique asymptote and sketch the graph Homework Equations f(x)=x^3+3x^2-x-5/x^2-1 The Attempt at a Solution My question is that shouldn't there be a hole in the graph when x=-1 or 1? The denominator would end up being zero. When should i be using an...

Apparently VY Canis Majoris is 30–40 solar masses, also there's R136a1 which is 265 solar masses. How do they remain stars with all that mass?

I know holes are made/present after electron leaves its place but are holes present in metals during photo electric effects? what is the mass of a hole (if it has any)? what are its characteristics are they exactly opposite of electron ( i mean its behaviour in electric and magnetic field ) ?

According to theory of black hole radiation, black holes are expected to emit a thermal spectrum of radiation, and thereby loss mass, owing to the E=mc2 equation. Well, everything was clear to me till I got to the last point. why should there be loss only in mass?? couldn't the mass be same and...

Hello friends! Forgive me, I have another question for you physicists. We see those active galactic nucley which show enormous emission phenomena, so: How can we know that responsible are gigantic black holes and not white holes? I suppose we guess it, becouse we have some theory on the...

What would happen? Would the result be a non-rotating black hole? During their collision when their ergospheres overlap, would it generate an area where nothing could move in either direction along the plane of rotation? Also, since the force of their gravitational pull would be the same, would...

Black holes are believed to be scattered throughout the universe. These ultra-dense bodies have a gravity field so dense that nothing, not even light can escape. If these bodies are able to consume everything that enters its event horizon than over the billions of years that the universe has...

Hi Guys, Just a thought, if a job of a black hole is to suck everything in it's surrounding to nothing-ness. Then why are the there examples of black holes with jet streams flowing away from their axial poles? Apparently the Earth's gravity field is weaker at the equator, so why does...