It is theoretically possible to leave our universe
It would seem, after contemplating the fourth dimension,
that it would be theoretically possible to leave our universe and enter
another 3 dimensional universe if we had the technology. If you asked
someone how to go about this, they would most likely say something along
the lines of "you would simply need to be capable of traveling in the
FOURTH physical direction, out of our universe, in the direction of
another, and into it.
I believe that this is not possible because relativity proves to us
that the dimensions ARE NOT 'compatible'. What I mean is that matter
from any given dimension CANNOT exist FREELY in any dimension higher
than itself. The matter MUST be contained in a universe of that
dimension or else the laws of physics would be broken. For example, we
have absolutely no idea whether or not a 2 dimensional universe exists
or existed somewhere in space or time because, for us, a 2 dimensional
reality is physically impossible. It is not possible in our dimension to
have matter that consists of length, width and no height. It would seem
that the only way for this to be possible is to have a 2 dimensional
universe for that matter to be contained in, and that universe would be
warped in on itself as a sphere causing IT to be 3 dimensional; allowing
it to exist in a three dimensional reality--- not breaking any laws of
physics. But lets say for example, some 2D people wanted to travel from
there sphere shaped universe to another.... How? As soon as they were
out of their universe, they would break the laws of physics... how could
2 dimensional matter exist in 3 dimensions??? Its not physically
possible.
Now apply all of this garbage to the fourth dimension... It would
appear that it is physically impossible for 3D matter to exist in the
fourth dimension. In a 4D reality, matter MUST have length, width,
height, and one more dimension for it to actually exist. Looking at this
situation logically, it seems that each universe is almost like a prison
that holds all of its energy and matter, and the universe itself is in a
shape that is one dimension higher than the matter and energy it holds.
Once we 'broke out of our universe' and were just suspended in a 4D
reality, would we cease to exist since we didn't have enough sides?
This brings up another interesting topic: a 2D object has a 1D surface,
a 3D object has a 2D surface, so that means a 4D object has a 3D
surface... So if Einsteins theory is true, that the center of our
universe is in the 4th dimension and our universe is a 4D sphere, that
means that all the matter, energy, and space that exists to us is simply
the surface of a 4D sphere.
(note that nothing I said goes against the possibility of wormholes,
because a wormhole would simply be 2 points of a universe bending and
crossing each other [in the dimension they are suspended in] creating a
"hole" to theoretically travel through. )