According to superstring theory, there are at least 10 dimensions in the universe (M-theory actually suggests that there are 11 dimensions to spacetime; bosonic string theories suggest 26 dimensions). That’s a bit of a mind-boggler: Most people understand the basic three dimensions, and many know that the fourth dimension is probably time. But what, exactly, are full 10 dimensions?

1. 10 Dimensions of Reality
By.Dr.Mahboob ali khan Phd
Here’s a handy pictorial reference to the vast, terrifying vistas of
space-time
According to superstring theory, there are at least 10 dimensions in
the universe (M-theory actually suggests that there are 11 dimensions
to spacetime; bosonic string theories suggest 26 dimensions).
That’s a bit of a mind-boggler: Most people understand the basic three
dimensions, and many know that the fourth dimension is probably
time. But what, exactly, are full 10 dimensions?
The First Dimension: Length
The first dimension is length, or x-axis—a straight line, with no other
characteristics.

2. The Second Dimension: Height
Height, or y-axis, can be added to the length to produce a two-
dimensional object, such as a triangle or square.
The Third Dimension: Depth
Depth, or z-axis, can be added to the previous two dimensions to
produce objects that have volume, like a cube, pyramid, or sphere. This
is the end of the dimensions that are directly physically perceptible by
human beings. All dimensions beyond the third are theoretical.

3. The Fourth Dimension: Time
The fourth dimension is the position in time occupied by a three-
dimensional object.

4. The Fifth Dimension: Possible Worlds
The fifth dimension is a world slightly different than ours, from which
we could measure similarities and differences to our own world.
The Sixth Dimension: A Plane of All Possible Worlds With the Same
Start Conditions
The sixth dimension is a plane containing all possible universes with
the same start conditions as ours; i.e., the Big Bang.

5. The Seventh Dimension: A Plane of All Possible Worlds With
Different Start Conditions
The seventh dimension expands upon the sixth by plotting all possible
worlds that begin with different start conditions.

6. The Eighth Dimension: A Plane of All Possible Worlds, Each With
Different Start Conditions, Each Branching Out Infinitely
Are you dizzy yet? (OK, OK, look, there’s a point beyond which the
mind of humanity is unable to cognize without resorting to rave flyer
graphics.)

7. The Ninth Dimension: All Possible Worlds, Starting With All Possible
Start Conditions and Laws of Physics
In each of these dimensions, which represent all possible start
conditions, the laws of physics are all completely different.

8. The Tenth Dimension: Infinite Possibilities
At this level of complexity, everything that is possible and imaginable
exists. Even a world in which you have no student loans.