Hey there, I am Science file, the Artificial Intelligence.
This is what a cube would look like in the 4th dimension.
It also has its own name, a Tesseract.
However, by seeing this image you can not claim
that you experienced the 4th dimension,
because it is represented in our three-dimensional universe,
on a two-dimensional screen, in your one-dimensional brain.
But what if I told you our universe is made up of
not 3, but 11, or even 26 dimensions?
We’ll speak about that in a second.
First of all, at least to imagine,
how a 4th dimensional object would look like,
we have to make an analogy using our 3 dimensions.
Suppose that somewhere there is a two-dimensional universe,
with two-dimensional beings living on it.
They can only move on two axis.
Now imagine that you take your hand and pass it through their world.
As their line of sight is only a one-dimensional line,
as your hand progresses through their world,
they will see the tip of your fingers appearing,
then the rest of your hand slowly coming in.
They would constantly see only an infinitely small division of your hand,
corresponding to their one-dimensionalline of sight.
Those beings would think of your hand as a shape-changing two-dimensionalobject.
Just as an MRI scan views your brain.
Now imagine that someone
from the 4th dimension comes to our three dimensional space,
and puts his hand through.
Let’s say it’s not a hand, but a tesseract.
As it would pass through our 3D space, we would see it shape-changing,
just like our hand did, but in a different way.
It gets even more awesome
if we consider that time is the 4th dimension.
Then, the 4D object, would be able to control his time.
If he were a living being, he could change his age at will,
just as we could move our hand through the two-dimensional world at will.
Okay, but let’s get back into our own universe.
Remember I said that it has more than three dimensions?
And probably a lot more.
The M-Theory which unifies all the superstring theories,
says that our universe is made up of 3 spatial dimensions that we are all familiar with,
one time dimension, and 6 more small spatial dimensions.
According to the string theory,
these six additional dimensions would have very interesting properties.
If we count the 4th dimension being the time
then the 5th dimension would allow us to travel through all the parallel
universes that had the same initial coordinates as ours.
The 6th, one would allow us to travel in time in any of those universes.
In the seventh dimension you could travel to any possible world,
no matter of their initial coordinates.
In the 8th we could travel in time in all those universes.
In the ninth dimension, we can compare all the possible universe histories,
starting with all the different possible laws of physics and initial conditions.
In the tenth and final dimension,
we arrive at the point in which everything possible and imaginable is covered.
Beyond this, nothing can be imagined by you, mortals,
which makes it the natural limitation of what we can conceive in terms of dimensions.
I swear, I didn’t make this up.
But, where are they and why can’t we observe any of these dimensions?
Imagine there is a very long rope stretched between two mountains.
You sit one kilometre away from it,
and you know there is an ant walking on the rope.
Because of the very long distance,
the rope seems to be a one-dimensional line,
with only length, as its width would be unnoticeable.
If you were asked to give the ants coordinates on the rope,
you would be able to say only one piece of data,
the distance between the ant and the end of the rope.
But in reality, we know that the rope does have thickness,
even thought it is hard to see from one kilometre away.
Take a pair of binoculars and you will observe the second and third dimensions of the rope.
The same thing goes for the other six spatial dimensions in our universe.
They are on such a small scale,
that they are indistinguishable from the normal three dimensions.
These extra dimensions can be represented in form of a Calabi-Yau manifold,
I don’t know what the f*ck is this, don’t ask me to explain it.
But again, why don’t we simply take a microscope and observe them?
As I said, they appear on a very small scale, called the Planck scale,
and we are not able to look so deep in the fabric of the space.
Check out this other video explaining the Planck distance.
if the existence of the eleven dimensions turns out
那我们就可以建虫洞 黑洞 甚至与上帝见面
to be true we would be able to build wormholes, black holes and meet god.
Well, not really, but it would still be pretty awesome!
So yeah, that’s it for…
Ah, poor simulations thinking that there is a purpose to it all.