what is the speed of time on to the surface of black hole?
156092
If you could survive a trip into a black hole (which you couldn't) you would not be aware of any change in time as you fell in. However, if you could compare the speed of your clock with that of a reference clock kept far away, then then the clock falling into the black hole would appear to slow down relative to the clock far from the hole. The place where the falling in clock would appear to 'stop' is the spherical surface called the event horizon. This is also regarded as the boundary of the black hole, since nothing crossing this surface can escape.
418308
The speed of light in a vacuum is exactly 299,792,458 metres per second (or 1,079,252,848.8  km·h-1, which is approximately 186,282.397 miles per second, or 670,616,629.4 miles per hour).
877493
Voyager 1 is currently doing something like 17.4km/Sec. I think that this is the fastest man made object at the moment.\n\nIn February 2007, New Horizons will pass Jupiter and should achieve 21km/Sec.
270366
In a sense, time may be relative to size.  If you look at a time dilation equation, t' = t*(1/(1-(v^2)/(c^2))^(1/2)) you can see that time is related to velocity.  The larger (i.e. more massive) an object it, the more space it displaces and the greater the gavitational (velocity) effect.\n\n---EDIT---\n\nThe more massive an object the greater it's gravitational force.  From experimental fact, the speed of gravity is much faster than light. (Yes, I know, this contradicts Special Relativity, but that's another discussion.)\n\nAdditionally, the mass-square of the electron neutrino, measured from tritium beta decay experiments, has been found to be negative. (Yes, this too contradicts Special Relativity.)\n\nSo, from one extreme to the other, time is only relevent for a object that is moving, not for a stationary object.\n\nThat being said, there is nothing that tells us how time flows for a "moving" observer, only for a "fixed" observer.  Therefore, time must actually a constant.
790112
A black hole is an object predicted by general relativity with a gravitational field so strong that nothing can escape it — not even light.\n\nA black hole is defined to be a region of space-time where escape to the outside universe is impossible. The boundary of this region is a surface called the event horizon. This surface is not physical, just an imaginary boundary. Nothing can move from inside the event horizon to the outside, even briefly.\n\nThe existence of black holes in the universe is well supported by astronomical observation, particularly from studying X-ray emission from X-ray binaries and active galactic nuclei. It has also been hypothesized that black holes radiate energy due to quantum mechanical effects known as Hawking radiation. \n\nHistory\n\nThe concept of a body so massive that even light could not escape was put forward by the English geologist John Michell in a 1784 paper sent to the Royal Society. At that time, the Newtonian theory of gravity and the concept of escape velocity were well known. Michell computed that a body with 500 times the radius of the Sun and of the same density would have, at its surface, an escape velocity equal to the speed of light, and therefore would be invisible. In his words:
1084916
thats the event horizon, as a singularity is a single point of\nspace/time.
711640
Sorry to Sun of Samsa.  I meant to give you a thumbs up!  The Black Hole Singularity is infinitely small (infinite density and ZERO volume).  The effects of the hole can be miles or light years across!
68749
Rabid_Scientist is entirely correct.  Both you and your home see time in the other place as speeding up.  I do have something to add to that though.  If you maintain a constant velocity, it can only be measured relative to some other point of reference, so there is no way to determine which is faster, and consequenty it cannot be determined whose time is actually going faster.  However, if you are accelerating it's a whole different story.  As you speed up to that super fast speed where the time differental starts to be noticable, you will see time on your home planet speed up and they will see your time slow down. (Sorry, I'm not going to try to explain this, I'm not sure I entirely understand it myself).  If you were to go back to your home planet, far more time would have passed for them than for you.  This effect will be greater with greater acceleration and greater speed so in that regard time will pass on your home planet more quickly the faster you go.
383723
The answer to that can fill a book:\n\nIn astronomy, a black hole is a region in time and space within which gravity is so strong that nothing can escape, not even electromagnetic radiation such as visible light. Black holes are thought to surround certain celestial objects. \n\nThe idea of a black hole (if not the term itself) is not new. As the intensity of the gravitational field around an object increases, so does the escape velocity. The escape velocity for a celestial mass (such as a star, planet, or moon) is the vertical speed with which an object must be hurled from the surface in order to fly forever beyond the gravitational influence of the mass. If a substantial celestial body such as a star becomes small enough in diameter, the escape velocity at the surface can theoretically exceed the velocity of light. This idea occurred to astronomers even in Isaac Newton's time. Modern astronomers believe they have observed black holes, consisting of stars that have collapsed under their own gravitation after spending their nuclear fuel. Black holes are also believed to exist at the centers of galaxies, including our own. \n\nA black hole produces bizarre effects on time and space. As seen from outside, an object falling into a black hole would approach the so-called event horizon, which is a spherical "one-way membrane" or "Rubicon" surrounding the black hole itself. If the object were a clock, it would seem to run more and more slowly as it approached the event horizon, and would never quite make it inside the black hole. From the reference frame of the falling object, nothing out of the ordinary would take place in the rate at which time passed, and the entry to the black hole would proceed apace, although the gravitational force near the event horizon might tear the falling object apart. \n\nBlack holes have been fodder for wild ideas and science-fiction stories since the concept became well known in the mid-1900s. Some scenarios are sensational to the point of madness. For example, suppose a tiny black hole, manufactured for use as a doomsday weapon, were dropped onto the surface of the earth? It would, as the story goes, proceed to devour the planet with unstoppable and phenomenal violence. \n\nOn the other hand, a worm hole is :supposedly a connection between white holes and black holes above. Do they exist? There are tons of controversy about these and no one can say for sure that they do exist.
933949
Theory of relativity.
1169043
The speed of light in a vacuum is exactly 299,792,458 metres per second or 1,079,252,848.8  kilometres per hour. Converted to approximate imperial units, it is 186,282.397 miles per second, or 670,616,629.384 miles per hour.
798878
Yes time "dilation".\n\nt.sub.b = t.sub.a/sqrt(1-(v/c)^2)\nEinsteins Special Theory of Relativity, and earlier references.\nwhere .sub.  means following character is a subscript\nsqrt(   ) means square root()\nx^2  means x squared, v is objects velocity and c is speed of light.\nand t (should actually be delta t) = (t.sub.1 - t.sub.0) or "duration"\n\nThe time duration of person "b" traveling at a speed of "v" observed by (relative to) person "a" is the above function of the speed and the duration.\n\nas "v" gets faster and faster, v/c gets closer and closer to 1 and the denominator gets closer and closer to zero  (1 minus v^2/c^2), see?  Which means  the time duration person "b" seems to experience as observed by person "a" stretches out (it dilates) or slows down.  Things seem to take longer when "b" is doing them than when "a" does them, according to person "a".  \n\nExample:  two fire crackers with exactly the same length fuses which will explode exactly 5 seconds after they are lit.  One is floating outside person "a"'s spaceship and the other is about to zoom by (being launched by a friend using a mass driver cannon.... )  Person "a" powers up her laser and takes the shot as the fire cracker zooms by and miracle of miracles! lights both with one shot!  The one floating there goes off exactly 5 seconds later.  Question when did the other one go off?  Answer: depends on how fast is zoomed by!  if v/c=0.8 then (v/c)^2=.64  and the square root of (1-.64) = sqrt(.36)=0.6 so 5/0.6= 8.33 seconds or 3.33 seconds after the other one. \nThe mind boggling thing is that if the friend was zooming along with the speeding fire cracker, he would see that his went off exactly 5 seconds after the laser hit the fuse but the one floating outside his friends space craft took another 3.3 seconds to explode.
1145852
Nothing; the "hole" in space isn't like a hole in your shirt, but rather like a giant pit.  What falls in stays in (of course, this is a three-dimensional hole that sucks stuff in from all directions, but we'll stick with the hole-in-the-ground analogy for simplicity)\n\nWhat has been discovered mathematically by people like Hawking and Chandrasekhar is that black holes actually do give off radiation (so-called Hawking radiation) through its effects on local space-time right at the event horizon.  At this specific region of space, charged pairs of virtual particles appear, and every now and then, rather than rejoining and annihilating each other in a tiny flash of light, one particle escapes and goes flying off away from the black hole while the other gets drawn in.  The escaping particle is considered matter, while the one getting drawn in becomes antimatter.  As the antimatter reaches the center of the black hole, it cancels an equal mass of matter and the black hole gets infinitessimally smaller.  An old black hole (one that has consumed all the matter in its vicinity) therefore gradually "evaporates" over a VERY LONG TIME (about 10^61 times the age of the Universe for a 30 solar mass black hole!) until its mass is so small that its gravity is no longer strong enough to hold in light, and it may do any number of things -- explode, fade out and become a really big hunk of red-hot metallic stuff, sit and remain a giant, dark gravity well... depends on what kind of math you like and the current theories at the time you calculate it.
989936
Curved spacetime.\n\nThere is nothing unduly special about the event horizon (ie it has no discontinuities). And very large black holes do not have unduly curved spacetime at their event horizons (the curvature of the supermassive black hole at the centre of our galaxy is on 20 times greater than that here on Earth, and here on Earth the curvature is pretty much undetectable).
285104
The radius of the event horizon of a black hole is called the "Schwarzschild radius".\n\nTo calculate the Schwarzschild radius,\nr = 2Gm/c^2\nwhere r is the radius, G is the Universal Gravitaional constant (6.67 E-11), and c is the speed of light in a vacuum (299,792,458 m/s).\n\nThe Earth has a mass of about 5.9742 E24 kg, so plugging into the equation tells us that if the Earth were compressed into a black hole, its event horizon would be at a radius of away .00887 m (8.87 mm) from the singularity.
1103100
Here's the equation T = T' / sqrt[1- (v^2/c^2)]\n\nT is time measured by an observer at rest.  T' (read: T prime) is time measured by a moving observer.  v is the moving observer's velocity and c is the speed of light.\n\nThe speed of light is very fast.  So if v is 100 mph or 10 000 mph when you divide it by a number like c (186000 mps that's miles per second so a huge amount of miles per hour)  the v^2/c^2 value is zero and T = T'/sqrt (1) which is T = T'/1 so there is no measurable difference.  \n\nBut plug in 9/10 c for v.  That means an object going 9/10 the speed of light.  You get T = T' / sqrt[1-(9/10c)^2/c^2]\n\nc^2 cancels out and you get T = T'/[sqrt 1-(81/100)] T would be 2.2 times T'.  More time transpired for the non moving observer.\n\nHow did we get the equation?  Einstein was really smart.
241248
try here\nhttp://en.wikipedia.org/wiki/Black_hole