Someone once told me that there are several dimensions in this world. If so, what are they? And is sound in a dimension of its own or is it something else?\n\nNOTE: I'm not too sure whether this falls under Astronomy or Physics, but I'll go with Physics...
120627
Sound is not a dimension of its own. It is simply the result of waves passing thru the air. This causes the air to be compressed and de-compressed according to the kind of disturbance that caused the wave. When you shout or hit something the air in this region is compressed and then begins to travel outward, fairly equally in all possible directions from the source.\n\nEach occurrence of the sound causes a new wave-front to be formed, Imagine a water wave, but in the air, and instead of seeing and feeling it you hear it...and if it's loud and intense enough you'll feel it.\n\nThe concept of dimensions gets tricky when we 3-d humans get beyond 4 dimensions of our real world; length, width, height, time.\n\nThere are many, many dimensions, but they reside in mathematical space and are impossible to visualize from the most part. One may be able to convince themselves that they can visualize 5 dimensions, but most likely not.\n\nI can't say for sure if anyone has enumerated the dimensions or not, and if they did if it would be a number you could really.....well...count on.....lol. The idea of a dimension has to be an abstract one of course, so you would have to let go of your standard thought about length, width and so on. Not an easy task to 'accept' for some folks, but that's what makes our world so much fun....always something cool to learn, discover or think about.\n\nHope this helps.
98024
No one can prove that there are more than 4 dimensions to our universe. And even if they could, it would be very hard to depict them in 2 dimensions i.e. a picture. \n\nI would suggest you track down the excellent book called "Flatland" by Edwin A. Abbot. It is even available free online from the attached link if your bookstore or library does not have it. \n\nRead Flatland, and then maybe some of the sequels. It is what I did when I was your age, or even a little younger, and I wanted to understand what a 4 or 5 dimensional world was about.
243267
what dimensions boil down to is this: to specify where something is in space we need to know four peices of information. take a location on the earth for example, if i were to ask you to meet me someplace you would need to know the lattitude, longitude and height above the surface of the earth (it doesn't do you any good to know i'm in the empire state building if you don't know what floor) and the time we were to meet.  these are the observable dimensions. some scientist theorize that the observable dimensions are not the only ones. the cannonical example would be to consider a wire like a wire on a telephone line. how would you describe where something is on a telephone line? if you look at a wire from far away it seems to have only one dimension, so instead of haveing to give three pieces of information to specify a place to meet i could only use two: "meet me 300 feet down the line at high noon".  but when we get close we observe that there is more then one dimension in the wire. if we were say ants crawling along the wire we would need to know if we were meeting at the top of the wire or on the bottom of the wire or whatever. the dimension that we don't see from far away is the analogy of the dimensions that we exsist in but aren't "observable".  they are balled up in a very tiny space, so that we don't notice that they are there, but if we were smaller then atoms we might notice
77343
The above answers are interesting but, modern physicists speak extensively about 'multiverses'.  So, does one universe end at the edge of another? or, do they 'co-exist' in space and time? OR??????
211785
i think there are parrallel dimensions that acctually collieded to create this universe, i saw it on the discovery channel.  Then again Dan brown's "Angels and Demons" sets off the idea that there is another parrelel demension exactly the same as our except everything is created of anti matter, the alternate of matter, therefore once antimatter and matter collide, boom both disapate.  They have been able to create anti matter.  (can you mark this as best answer)
499544
This is a very difficult concept and you probably won't get a great answer for it.  First off, this is only speculation - there is not a shred of evidence that there are 11 physical dimensions.  We can only claim 3 (time is considered the 4th dimension, because you need all 4 to describe to fully describe an event - for example, if you throw a rock in the air, if you want to know everything about where it lands you have to know the longitude, latitude, altitude and time with regards to a reference point).\n\n11 physical dimensions spring from string theory, which postulates that everything including time and space and matter and force are made up of vibrating "strings", either open ended or looped like rubber bands.  These strings are inconceivably tiny - if an electron were the size of the solar system out to Jupiter's orbit, filling in the volume, the string would be about the size of a granny apple.  It's thought that physical dimension 4-11 curled in on themselves at the Big Bang, and are only relevant on the same scales as the strings themselves - the other 3 expanded to fill the universe that we know today.\n\nOne way to image it is to imagine the Earth as a perfect sphere, without mountains or valleys, no hills, no riverbanks, no sidewalks, just a perfect, absolutely perfect sphere.  Now imagine an ant walking on the sphere.  The Earth is so fricken huge compared to the ant that the ant will only think there are two dimensions, x and y (assume that the ant has no self-awareness, and didn't realize he himself is above the x-y plane).  In reality, the Earth is a sphere, with a z component, but the ant will never know that.  The same, in reverse, could be true for the other 7 dimensions - they are so small we can never comprehend them.\n\nUnfortunately, with today's physics, that also means we can never confirm or deny their existence.  Without empirical proof, string theory is just beautiful mathematics, without a shred of proof.
347071
If your legs lived in, say, the 4th Dimension - how would your brain be aware of them since it exists only in 3 Dimensions? We are physically in 3 dimensions (time is an illusion made to mark the difference between one state and another) - we can comprehend of separate parts of our bodies being in different dimensions as much as a stick man drawn on a piece of paper can imagine moving freely around the room in 3 dimensions.  We can only visualise higher dimensions using tricks such as looking at the shadows cast when a 4 dimensional object is illuminated inside a computer program.  What would it matter how big the sock was to be pan dimensional? Good question though.
37354
Actually from mathematical point of view you are correct but from physics point of view there is what called planck dimensions. It is supposed in quantum gravity that you cannot divide space to reach lower than these dimensions (1.6X10^-33 cm).
84331
Well, I don't know if you meant Universe's or a Gaalaxy, but assuming you meant Universes...\n\nThe word Universe is used to to describe the entire physical world. Meaning everything that is in space, every planet, star, comet, etc. is all part of the Universe.\n\nWhat some physicists have speculated, is that there may be "alternate universes". Universes that we cannot see because they are in different dimensions then we are. \n\nWe live in a four dimensional world. We have the three dimensions of 1. up an down, 2. right and left, 3.back and forth, and 4. time. \n\nIt is hard to comprehend extra dimensions, but some physicts have speculated that the extra dimensions may be incredibly small, and every time we move, we push them aside, but not into them.\n\nIt get's rather complicated, but this theory is used in some modern physics theories, such as String Theory.\n\nWe cannot access alternate universes even if they do exist, because we do not live in those dimensions. So as far as we know, the answer is no.\n\nYou also have to realize how incredibly vast space is. Astronomers use "light-years" to measure distance in space. 1 light-year is the distance light would travel in 1 earth year. That is a very, very large distance. So it is difficult to send spacecraft anywhere far even in our own universe.\n\nI am no expert though, and would reccomend searching wikipedia.org for answers.\n\nGood luck!
43539
Yes, definitely multiple postings... \n\nwell... a fourth dimension is time... so anything that changes over time is a fourth dimensional object. But that isn't what you are really asking.\n\nWe can only perceive four dimensions with our senses, so perceiving it is difficult. To us it would look as if it were a regular three-dimensional object, perhaps changing over time in some subtle way. Jack L. Chalker did a good job of describing such a structure in his "Quintarra Marathon" books. This is similar in idea to how you would describe a three-dimensional object such as a pencil to a person living in a two-dimensional world, at best they could only see a cross-section of the pencil, or if the world they were living on were curved they would see multiple cross-sections and not realize they were the same object (put a pencil through a folded piece of paper).\n\nIf you are looking for a way to visualize it to help with problem solving I recommend thinking about it in terms of computer arrays, or a group of three dimensional objects, each can be looked at seperately.\n\nGood luck with your conundrum :-)
94147
it all depends on if you believe in multiple universes and dimensions if you do then yes ours is an entangled multi dimensional universe. Another thing if we are then whose universe are we in???
176911
I believe in the multiverse in the sense that we are perceiving one universe, but there are many possible realities that could have brought me to my current perceptions and there are many possible realities that originate from my current perceptions.  If there is no such thing as time, then all possible perceptions exist together, and what we perceive as time passing is merely our awareness of particular moments in one of the threads of events that are already existing in the "multiverse".
128705
Before we take on the four-dimensional Universe first a two-dimensional example. \n\nImagine a two-dimensional plane. An ant walking on it can go in any direction, without finding a boundary. Secondly if it keeps walking in one direction, it will never come back on the same place. The plane is infinite, without bounds.\n\nNext the surface of a two-dimensional sphere. This time the walking ant again will not come to a boundary, but he will, after some time, come back to the some place. The sphere is without bounds, but finite.\n\nWe see that these two ant Universes are different, although a shortsighted ant, would never be able to distinguish the two.\n\nNext lets move to our Universe. We are short-sighted ants too. Our telescopes can not see far enough to distinguish if we are in the three-dimensional equivalent of the sphere of the plane. \n\nAnd it is even worse. As we are living in three dimensions  more complicated space are possible. Imagine we are living in a cube, a special one with the following property. As soon as we leave the cube through one side, we enter it again on the side opposite where we left. This space is the 3-dimensional equivalent of a torus.\n\nYou see were we go: in three dimensions more complicated space are possible. One is the dodecahedral universe you mention. It has the shape of a dodecahedral, again with the property that if we leave through one side, we enter through another.\n\nImplausible? Maybe. Maybe not. At present we really have no way to tell. Just as the short-sighted ant.
248419
That question is hard! Nobody has ever been there. Or maybe we all are always there. I don't know. But the different dimensions tell you a position and it is getting more exact with every dimension:\n1D: where x is\n2D: where x and y are\n3D: where x and y and z are\n4D: where x and y and z are and when they are there\n5D: I don't know, but you could think of something that would give a more exact description, such as (this is just an idea that went through my head, not anything from a scientist!):\n5D: where x and y and z are and when they are there and how they are there and then\nDo I make sense? Don't hate me if I don't!
289306
Actually, the first two answers are right; but, disregarding time, if we were 4-dimensional beings we would still only cast 2-dimensional shadows.\n\nEven 2-dimensional objects also only cast 2-dimensional shadows.  Anyway, what would your 4th dimension be?\n\nShadows are merely the result of an object being between the shadow and the light source; shadow is merely absence of light.  Shadows are always 2-dimensional.\n\nAnd as far as considering time to be a dimension goes, we are IN the dimension of time, but we are not IN the dimensions of width-height-length.  They are attributes used to describe us; they are part of us, we are not part of them.
592824
Thank you! Very informative (and correct) information!\nWell, according to Physics, the same vast quantities, dimensions etc., we have to the large scale, we also have to the small scale, going from our size into smaller (cells, moles, atoms, electrons, nuclei, ....)\nFurther, according to my theory, the Universe we described above is the connection between other universes! As a matter of fact, each one of us is a Universe greater that the one we usually talk about! After all, people discover the dimensions, Greeks named 4 of them and we, somehow think we understand them! People understand only what has been named! That is why we can not comprehend the other dimensions, since we have not discover how the Greeks named them!
130702
how do you understand anything?  We can't understand everything there are things beyond our comprehension.  Try to think about this, does space end?  Is it infinte?  what is infinite?  You kno?