Is there a 5th dimension?
100590
http://www.astronomycafe.net/cosm/dimens.html\n\nlong, but good explanation\n\nalso, do a search for a hypercube...you should find some interesting info there.\n\nhttp://rds.yahoo.com/_ylt=A0Je5mF.7vJDtigAKCNXNyoA;_ylu=X3oDMTE2bzk5aTlkBGNvbG8DdwRsA1dTMQRwb3MDMwRzZWMDc3IEdnRpZANGNTYxXzg4/SIG=12aalomvk/EXP=1140080638/**http%3a//www.physicsforums.com/printthread.php%3ft=16762\n\nsort of a debate on the topic, a lot of idiots speaking their mind too.  \n\n\nFor questions like this, all you have to do is a yahoo search... I wish people would stop being so lazy
215076
I fear i had even thought about the ∞ dimension once. Nearly anything could be described as rotations there. It has took a long time to get a foot on earth again.\n\nTime is not the real 4th dimension. Perhaps c*t. Look at this 'Minkowski space' thingy:\n\nhttp://en.wikipedia.org/wiki/Minkowski_space\n\nIf you measure across space AND time, there are negative distances. What shoud a negative distance mean in reality?\nIf you consider time as the 4th dimension, it is just a convenient way to write down long terms shortly or to visualize complex relations concisely. It isn't more than just mathematics.\n\n\n"As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality." \n\nAlbert Einstein (personally himself)
183005
Alot of people pinned down 4 dimensions pretty good, but nobody has explained the dimensions beyond 4 very well, except to say that they exist. Let me take a shot:\n\nOPE did the best job of explaining the first 4 dimensions, I'll summarize and then move into the other ones.\n\n0D: Imagine a point, the smallest little dot with no length. There is only one point in this dimension, 0.\n1D: Imagine a line that can have any length in 1 direction but no length in any other direction. We can describe a point on this line with one coordinate, x.\n2D: Imagine a sheet of paper that is infinitely thin (you hold it sideways you see nothing). We can locate a point on this plane by (x,y).\n3D: This one's easy. You find a point in 3D space by (x,y,z)\n4D: Harder. In 3D, your point cannot change. You cannot move around because in order to change position you need one more dimension, time. For a point to move from one place to another (dx,dy,dz) it requires a change in time (dt). To locate this point now you need to define its position as (x,y,z,t) or else you won't find it. If you imagine your point is a person you want to meet, you would have to be told where in space (x,y,z) they will be and when (t) they will be there, or else you are not guaranteed to find them (unless you both have cell phones).\n5D: The hardest. Go back to 0D (a single point). If we were able to shrink down to the size of this point, instead of seeing a point, we would see a tiny circle. So if you were trying to locate a point in 5D, you could not locate it exactly unless you placed it in (x,y,z,t) and w, it's location on that circle. So you now have (w,x,y,z,t). The radius of this 5th dimension is so small that we can't see it, but we should be able to perceive its effects when our technology improves. It makes a lot of sense mathematically because it explains why we can't explain gravity at tiny (quantum) levels. The math doesn't work unless we add dimensions and wrap strings around them. Note that dimensions 5 and up have a property called compactification. That means that anything operating on the compactified radii of these dimensions moves in a complete circle, always returning to its original position. The radii are so small that we cannot percieve a change in position at all; a particle changing position along one of these dimensions seems to not move to us.\n6D and up: Very hard to imagine. Your point can now be found on two circles. The easier way to think of this is a point on the surface of a sphere, which will give it two coordinates on a tiny round surface (like longitude and latitude on the Earth's surface). Now you can add as many compactified dimensions as mathematics permits given whatever theories you are trying to incorporate. Your compactified radii can be given upper and lower limits to allow them to be plausible.\n\nI saw some people say infinite dimensions and another say 27. The reigning theory has 11 dimensions. 27 dimensions comes from a part of string theory that claims that matter does not exist and that there exists a fantasy particle with very strange properties, called a tachyon. This theory ties in to the most prominent theory, M-theory, which says only 11 dimensions is needed to explain everything.
281863
yes, there definately should be because sedonions are just 16-dimensional numbers, if you can have an infinite amount of dimensions... do the math
706278
I know four dimensions: x, y, z\ntime is the fourth\n\nBut in addition, theories such as string theory predict that the space we live in has in fact 11 dimensions, but that the universe measured along these additional dimensions is subatomic in size. As a result, we perceive only the three spatial dimensions that have macroscopic size
271997
It's amazing isn't it?! It's so beyond our technology to fully test the theory though. I do however believe in parallel universes because math proves that you can have more dimensions beyond what we possess. Have to be able to open your mind to understand, ya know?
457925
Well there are 3 spatial dimensions and one temporal dimension, so there's 4 to begin with. On a macroscopic scale the universe behaves like a minkowski space. However on a microscopic scale even 4 dimensions isn't enough, the maths suggests possibly 11 or more dimensions.\n\nHowever I have a feeling you're not talking in the strictly mathematical sense. If you meant "are there other universes 'beyond' ours", then I have no idea. There are theories that suggest there are, but as far as I know there are no known observations that could answer that yet. We'll just have to wait and see what is discovered.
983939
The problem with detecting the fifth dimension (or the sixth, seventh, and so on, it is believed there are 11) is that our bodies are built to measure only the three old-fashioned spatial dimensions, plus time as a fourth dimension.\n\nScientists have been hoping that at least one of the extra dimensions might be rolled up in such a way that its influence could be seen by measuring gravity's pull on a scale of, say, a millimeter or less. So far, no anomalies have been officially reported, although there have been occasional blips that are likely due to tiny experimental errors rather than the fifth dimension.
738515
Quantum equations reveal that there are 10 dimensions within our trans-dimensional "neighborhood", which is speculated to be subdivided into two major and separate arenas:  1) The 4-dimensional physical multiverses (including our own "Known Universe" amongst countless similar parallel universes); and 2) the 6-dimensional hyperphysical multiverses contra distinct to the antipodal 4-D multiverses.  In addition to this, Superstring Theory and the new emergent "hyperphysics" imply that 90% of the Universe is missing.  The equations appear to be indicating that beyond the 10 dimensions there is also the existence of 34 to 37+ "Super-Trans-Dimensions" of infinite and immeasurable scale and attributes, and having a state and condition to time that is "Absolute Infinity".  Some are suggesting that this realm may be where God exists.  In totality, all this suggests the existence of a gargantuan “Trans-Universal Superstructure” that if compared to our miniscule “Known Universe”, our universe would be the size of a mere grain of sand.
335734
I consider humans as being 4 dimensional and existing in a 4d world...unfortunately we cannot fully interact with the 4th dimension (I guess we are temporal retards)......but that aside......\n\nYour 2d and 3d examples are correct because they are both physical dimensions.\n\nHowever, a 4d observer would not be able to touch every molecule of a 3d world which he was observing........this is because the 4th dimension is temporal rather than physical....he would still have physical boundaries.\n\nHe would be able to interact with a 3d world in the same physical way as we would, but he could do it in the past or future....which we cannot unfortunately....we are stuck in our present...moving ever forward in the temporal plane.\n\nPhysically, he would also be able to interact with his 4d world in the same way as a 3d observer interacts with their 3d world (and it would simply appear normal to him).\nTemporally, he could interact with his 4d world in the same way as he could interact with a 3d world...he could travel in time, but would remain constrained by physical barriers.\n\n5d.....well.....what is your definition of the 5th dimension ?\n\nProbably somewhat different to mine !!!
1172936
1 dimensions is a line    width, but no height or depth\n\nif you lived in one dimension you might know the person or thing on each side of you, but you could never pass them, there is no way to go around or over them because there is just the one dimension, back and fourth\n\n2 dimensions is a plane    width and depth but no height\n\neverything in a two dimensional world is flat, you could go over or under something you met but not around because there is no around, you are flat and so is everything else\n\n3 dimensions   is like our spatial universe width, depth and height\n\nthings have volume\n\nsome constructs use time as a 4th dimesion but that is really a different deal, there are only 3 spatial dimensions that we can percieve.  it is hard to imagine what another spatial dimension might be like
158992
sorry i must really correct the first answer before i continue;living in a 10 dimensional world is just a theory,known as string theory,and that is all it is,there is no proof\n\n(and the theory ACTULLY states that there are 11 dimensions)\n\na 2d object could not even physically exist because even if you had the smallest possible object that could exist indepdantly(an atom) it still has dimensions of length width and height,however small it may be it is not 2d\n\nIn writing the answer im kinda curious as to Could you theoretically stack and infinate number of 2d objects on top of each other and it still remain 2d?? anyone know?
1101802
Refering to the four dimensions, I assume you mean three spatial dimensions, and one of time.  This is correct.\n\nString Theory, which is a possible candidate for the Ultimate Theory of the Universe, demands that there actually be ten spatical dimensions!  Four spatial dimensions is impossible for our brains to comprehend and picture let alone ten.  \n\nYou might be wondering why we aren't aware of the extra seven dimensions if they do exist.  The reason: they are curled.  Let me explain what that means.\n\nImagine looking at a clothesline.  From afar, it looks like the clothesline only has two dimenions: you can either go left or right.  Now when you move closer, you are able to see the third dimension of the line, which would allow say an ant to crawl around (up and down) as well as left and right.  You couldn't see that dimension from afar because it is curled up and very small.\n\nThis is the same principle with the other seven dimensions.  They are curled up, and can only be seen if we were able to probe to a small enough distance.  This distance is actually a millionth of a billionth of a billionth of a billionth of a centimeter!  That is way too small for us to be able to see today, and probably for quite some time.\n\nThere are some tricks though for getting a feel for 4 dimensions.  You consider an example that relates 2-D to 3-D, and then apply that to relating 3-D to 4-D.\n\nFor example: imagine a table top is a 2-D Universe, and on that Universe lives a being shaped like a square.  If you were above this 2-D plane and were to talk to the square, he would hear you, but not see you.  If you decided to show him a sphere, would have to pass the sphere through his 2-D Universe.  The only problem is, he wouldn't see the 3-D sphere.  He would see at first a point, followed by a succession of circles that kept growing until you reached the mid-point of the sphere, which would be the biggest circle.  Then as you continued to move the sphere through the plane, he would see a succession of circles that got smaller until he saw a point, and then nothing.  The point is, he would only see cross sections of the sphere, which are circles.  \n\nNow apply that to our Universe.  If a being were in the fourth dimension and tried to pass a hypersphere (a 4-D sphere) through our Universe, we would only be able to see cross sections of that hypersphere.  What would we see?  We would see a succession of 3-D spheres that kept growing, reached the largest size, and then shrunk back down to nothing!  So, the cross section of a 4-D sphere is a 3-D sphere.\n\nHere is another really cool example.  Going back to the square being, let's say he had a safe.  His safe would have four walls, in which one of the walls would act as a door.  It would basically be a hollow square.  Since there are four walls, a 2-D being in that Universe would have no chance at getting any money out of the safe without opening the door.  However, you being in the third dimension above the 2-D plane, could simply reach in and grab the money coming from the top. It would be a complete magic trick to the square.\n\nSimilarily, a 4-D being could reach in our 3-D safe reaching in from the fourth dimension, and take our money without opening the door!\n\nHope that helps.
113366
The 4th dimension is time. It is essentially equivalent to "flat land" falling through the 3rd dimension.
470490
String Theory says there may be several more; up to 10 more dimensions, IIRC, but they can generally be ignored, in "real life".  This is because the extra 10 or so are tightly "wound up", so they act as if they are not there, most of the time.\n\nWords do not suffice to discuss String Theory; you need mathematics.  Howver, my maths skills are limited, so I just read the simplified verbal summaries.
354823
Currently man believes or percieves only 3 spacial dimensions.  Height, length and depth.  String Theory, the unification theory of quantum and relative gravity hypothesizes up to 11 other spacial dimensions.  God resides where man can not comprehend and angels fear to tread.  Remember, the heart has its reasons of which reason knows nothing.
355582
As a previous poster mentioned... time is the fourth dimension.  You can easily visualize this when you imagine an object moving in three dimensional space.  The movement represents the fourth dimension.\n\nI think you are asking about a fifth dimension.\n\nPeople have mathematical models for up to eleven dimensions.  I suppose that a person who knew the mathematical models for these dimensions could imagine them visually.