graviton and black holes?
468852
A black hole, by definition, doesn't emit light; photons can enter the event horizon of a black hole, but cannot emerge from it. If you can't see a black hole, then how do you know it's there?? In order to detect a black hole, you have to be devious and use indirect methods. \nThe method of detecting dark objects by noting their gravitational effect on luminous objects is a very old one. \n\nThe planet Neptune was first discovered from its gravitational effect on the planet Uranus. \nThe white dwarf Sirius B was first discovered from its gravitational effect on the star Sirius A. \nA black hole can be discovered from its gravitational effect on luminous matter (stars and/or hot gas).\n\nIf a black hole exists in a close binary system, it can be detected indirectly. Gas ripped from the companion star will spiral in toward the black hole. As it does so, it is heated up (by tidal heating, and by friction as it rubs against neighboring gas). The hot gas emits X-rays as it undergoes its death spiral to the event horizon. (Once it's inside the event horizon, we don't see the gas any more, but it's highly visible as long as it's outside.) If you are hunting for black holes, it's good to start by looking for binary star systems which are also strong X-ray sources. \n\nAbout a dozen other black hole candidates, with masses up to 10 solar masses or so, have been found in binary star systems within our galaxy. (We don't expect too many black hole stellar remnants, given the scarcity of the extremely massive stars which are their precursors.) \nAn interesting recent development in astronomy is that supermassive black holes (that is, black holes more than a million times the mass of the Sun) are found at the centers of many galaxies. Our own galaxy, for instance, has a black hole with mass 2.6 million Msun at its center, 8000 parsecs away from us. Our own galactic black hole is actually fairly wimpy. The Andromeda Galaxy, 700,000 parsecs away, has a black hole with a mass of 30 million Msun. \n\nHow do you go about hunting such supermassive black holes? As usual, you go about it indirectly, by looking at the orbital motion of gas and stars near the centers of galaxies. For instance, the observation of stars near the center of our own galaxy has revealed that they are orbiting a massive object with M = 2.6 million Msun. The closest star to this massive object comes within 17 light-hours (120 A.U.) of its center. The only plausible way to cram 2.6 million solar masses of stuff into a sphere 120 A.U. in radius is to make it all into a single big black hole. (For instance, if you tried to make a cluster of a million neutron stars 120 A.U. in radius, the collisions between neutron stars would make them all merge into a single big black hole within a few hundred thousand years.)
1060153
Black holes are very dense spaces where eveything is sucked up. It cannot be the cause of a big bang because the bang cant occur in the first place. Even if there was a bang, that would be sucked up too.
1013973
Gravity can move bend and obsorb light ie. black hole
651133
The black hole is where the force of gravity has successfully joined our known universe back with infinitely dimensional space. \n\nSpace is where our universe was born in a disturbance known as the big bang.  \n\nThe black hole is the grand finale to gravity, gravity's 'goal' creating a porthole to where we came from before the big bang.  \n\nGravity is the connection space has with our universe, too stubborn to let us go and will one day bring us back to become nothing and everything with it once again.\n\nPeace Out
383276
Mass (or rather gravity) bends space, as has been proved sometime ago = it works in this way - Imagine a water bed representing space. If you place a heavy canon ball on the water bed, the bed would have an indentation where the canon ball was placed. The area surrounding the canon ball would also be warped towards the canon ball. So if you placed a tennis ball on the bed near the canon ball, the tennis ball would roll downwards and lie touching the canonball. Similarly, huge masses such as the sun, do bend space.\n\nThis is one of examples associated with proving the existence of black holes too.
5021
yes, space-time gets warped/bent with mass.  This has been used to try and explain gravity somewhat, but with objects like planets, it doesn't happen that much.  The 'strings' from string theory and black holes bend space-time considerably.  black holes are basically singularities the size of a baseball that are as heavy as a planet or star... that's how dense they are.  It's basically so dense that it's just protons and neutrons smashed together, and considering that most of atoms are usually empty space, this is very very tightly packed, which is why there's so much gravity and the escape velocity to get out of a black hole is so great that even light isn't fast enough to get out.  Cosmic strings (the ones froms string theory) are also this dense and they are also said to bend space-time around themselves.  If you're interested in this, I would read "The Elegent Universe" by Brian Greene.  It will explain it a lot better than I can here.
403857
yes, black holes really exit.\n\nhttp://en.wikipedia.org/wiki/Black_hole
862081
No one knows for sure what creates gravity, we only know that it is a force since it causes an acceleration, and what the conditions are for it to be present; which is any amount of mass. Everything creates gravity, including you and me, but it is only noticeable with large masses such as the earth, sun, and well, black holes.  If we knew what creates gravity, a whole lot of other questions could then be answered, such as if time travel is really possible. A black hole could suck the the sun in but that is seriously unlikely to happen since one of any meaningful size is hundreds of light years away. There are however very, very, very tiny black holes that likely occur naturally in our upper atmosphere as solar particles collide with our air. Next year in Europe, an experiment at a particle accelerator will attempt to prove the math behind this to confirm the mini-black holes' existence. Bottom-line... after next year, we might be able to tell you something more about gravity and what creates it.
634270
i think the problem is when you try to apply general relativity - or gravity - to interaction betwen subatomic particles - especially when trying to understand how these forces worked during the first instant after the big bang. you wind up with nonsencial results - like zero equals one.
936416
you should see the nova on blackholes, it was on last week\n\napprently only to much can actually get to the center at a time, and most matter/energy gets bounced around within the event horizon, never to escape, but not actually getting all the way in\n\nand anyway blackhole emit particles of hawking radiation and would eventually expell there mass and kinda evaporate away\n\nand if one black hole had the whole universe in it, sounds prime for  big bang to me
308048
There are two theories.\n\n1.  Mass has the attribute of warping space much as a billiard ball placed on a thin sheet of rubber would warp the flat sheet.\n\n2.  Massless particles called gravitons interact between the masses involved.
224610
unless this is a "zen" question, it doesn't "go" anywhere.  A black hole is a former star that has died and collapsed in upon itself and had its mass "infinitely" compressed into a tiny tiny volume.
533667
Black holes are not holes at all.  These do not have any bearing on other universes.  They are just extremely massive objects that have collapsed within the Schwarschild radius and into a single point, which creates an area in space in which light could not escape if it gets so close.  \n\nAs for other universes, according to string theory we exist in a 3 dimensional subspace of a 13 dimensional universe.  Since we only occupy 3 dimensions, there could be other multi-dimensional subspaces which could affect our universe.  In fact, one theory of the big bang is that gravity from another universe and our own had caused them to touch, which concentrated energy in a single region, since energy is subject to gravity.  After this touching, the two universes went apart, and caused this energy to expand and 'cool' into matter that we know as our own universe.
600386
You don't need a black hole to be able hold itself together through gravity. Just look at the earth or the moon for example. They are nowhere near as dense as a black hole, yet they support themselves gravitationally.
205433
At this point the big thing we're looking for is the higgs boson.  until we find that, all are ideas of what gravity is are unconfirmed.  All we can do is describe how it behaves.
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.
512909
Well let me explain it.\n\nYes there is probability. But it is very small. Theoreticians\nhave predicted a particle that on anhiliation can create a small black hole. This black hole can grow by eating nearby matter. This way, it's gravitaional pull will increase.\n\nHole ---> eats matter ----> becomes bigger  ----> eats more matter.\n\nThis way, it will eat up the whole of the universe !!\n\nBut as I said, chances are rare !!!