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Originally Posted by d*d
I find this fourth dimension business tricky to get my head around (in fact I believe it to be impossible for us to truly comrehend) if we take a dimension away it becomes more easily digestable. this expansion of the universe is not as it sounds - an expansion from a central point, because the whole universe is moving away from itself in every direction,
if you were to draw points on a deflated balloon and then blow the balloon up all the points would move away from each other in a similar fashion but the central point of expansion is inside the balloon i.e not on the surface with the dots. Theoretically time is the dimension from the centre of the balloon to the surface, works fine with a 2d surface chuck in a third dimension and suddenly it hurts to think about it
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Think of time as the difference between two events that happen in space.
When you define time that way, it's easy to see that expansion is what causes time to exist, because an event will happen, and across that time line of expansion, the next event will happen. It ends up being linear and measureable through space-time. If time didn't exist, we would just have 3d space. Nothing would move at all. Being able to move is a dimension, which is defined by time.
I used to think of this when I was a kid.
If you were to take a human down and look at the smallest thing they are made of, and look at space as a 3 dimensional grid, each time you moved, that small thing would have to move into the 3 dimensional space, and so on.
Now, I was always confused when I was a kid, because I asked myself, how is it possible for us to move then? How can our smallest parts move into the next 3d space?
When you are a kid, it's a lot harder to think of why that happens. You might be like, well, it just does, but honestly try to come up with an answer. Time will always be a factor in any answer given. Why? Because time is the dimension that allows us to move into that next 3d space. If we just had three dimensions, things would just be.
Time has a direction, also. You just can't draw it on a 2d piece of paper, which is how we generally think about such subjects. You would, however, be able to draw it on a 3d piece of paper, if they existed. 3d papers, which are 4d models, can only exist in 5d universes. That's just a thought of mine.
I heard somewhere that if you were to have people in different universes, which had a set of different dimensions, ranging from 5d to 1d, you would end up with the following.
5d can see and comprehend 4d easily and draw it and all that shyte, 4d comprehend 3d, 3d-2d, 2d-1d....
Think about it for a bit. It makes sense.
But it also reverses. 1d can't see 2d, or comprehent or model it. 2d can't see 3d, and so on.
Also, try to draw in 1d. It's impossible, because your pen always has a width.
I need to go to class now. More on this later!