|String theory says that every particle is actually made up of minute strings of energy
vibrating. Lets consider a guitar string vibrating.
|The harder we clock the string of it the more would it vibrate with a greater
frequency.
|The same way...the harder the strings of energy inside matter vibrate...the greater frequency energy
waves do we get...i.e the greater will be the density of the waves formed along the surface of the string.
HOWEVER................
|However, that string is usually clocked or hit only in one direction or one plane or one
dimension. Lets call this dimension as the X-Y plane.
|No matter how hard have we hit this string...we were still moving about in the
same X-Y plane. However the same string can be hit or made to vibrate in many many ....infact infinite dimensions.....infinite
possible directions....i.e up-down, at a 40° angle, at 60° angle, front-back, right-left and so on.
|The same way the strings of energy in our universe may be vibrating in different dimensions. However
not necessary whether we are able to see all these dimensions, perceive all these dimensions with our senses and so on.
|Lets say a string when vibrates at a 180°, we are able to see it. However the moment it
vibrates at even 190°...our senses are no longer capable of perceiving them ....i.e neither can we see them, nor can we touch them.
|The string now as if does not exist in our world. This is the point we can say that it has
moved into a parallel universe.
PARALLEL UNIVERSES ARE NOT LITERALLY PARALLEL IN "DIRECTION" TO OUR UNIVERSE.
|They are just energy and matter vibrating
in another reality...or another dimension simultaneously with ours. Thus they parallel in terms of their parallel existence. However this parallel has got nothing to do with the
parallel lines that we study in maths.
|Perhaps another apt word for them would be a simultaneously running
universe.