### Is there a fourth dimension?

The question of whether or not there is a fourth dimension is an intriguing one. I'll attempt to explain why I believe that there IS in fact a fourth dimension. In order to have a curved line, which is the first dimension, you need a second dimension for it to be curved on. But in order for the second dimension to be curved to curve that light, there must be a curved third dimension. But in order for there to be a curved third dimension, which is what we're in, there must be a fourth dimension. That is my reasoning behind the possibility of a fourth dimension.

## 4 Comments:

I don't know much technical information about this but I agree that there are four dimensions. I read a book called "Flatland" by Edwin Abbott, which explained how beings in the different dimensions have different perceptions of what really exists. In the first dimension, a dot wouldn't be able to percieve that a line exists. A line in the second dimension wouldn't be able to imagine a 3-D object. Therefore, we can't imagine a fouth dimension and being able to control it. Also, if a 3-D object enters the second dimension, it looks like a line because only a strip of the object is in the plane of the dimension. If something from the fourth dimension came into our dimension, we wouldnt be able to tell.

I believe that there is (at least) a fourth dimension but I believe your reasoning to be flawed. The second dimension on which a line may be curved does not need to be curved itself for a line to curve. As an example take a flat piece of paper and draw a circle. there you have a curved line on a flat two-dimensional surface. Using your reasoning the fourth dimension would also have to be curved, leading to a fifth dimension, which leads to a sixth... and so on. We'd have an infinite number of dimensions in that case. It is widely believed that our universe actually wraps around itself in which case a fourth dimension would be necessary but that fourth dimension would not necessarily curved.

I personally like string theory which posits that we live in an 11 dimensional world (including time) but that the other spatial dimensions are curled up on a very small scale that we cannot perceive even with our most powerful microscopes.

Yeah, I must agree with mparent on this one...the fact that a curved plane creates a three dimensional space does not prove that there is a 4th physical dimension. I think that your X+1 exists because X exists is a little shaky. How can we determine this? This logic seems to be going in reverse if anything. If X-1 exists, X COULD exist is a much better way of proving another dimension exists.

Now the point that I'd like to make is that the fourth dimension is time. There is no spacial 4th dimension but a temporal one. An object exist in a space that travels along a temporal line. This in effect creates a 4th dimension. We do not currently exist in the past...but we did at one moment. It's just like moving through space only we don't have any control over it.

i think i might have to side with kermit on this one. if something from the fourth dimension came into our world, we wouldnt be able to tell because i don't think our minds could comprehend it. two dimensional things understand the one dimensional. by this i mean since it's a dimension lowe, it makes sense. in this same way, us three dimensional beings understand two dimensions and one dimension because it is in our line of sight to comprehend it. if something from a higher dimension came in, either it wouldnt still be in it's fourth dimensional state, or we just wouldnt understand it.

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