Just a little food for thought. This concept is simple, but its kinda hard for me to put it into words, so bare with me. And let me start by saying i dont like the term "universe".
Consider the Atom. An atom is made up of sub-atomic particles - protons neutrons and electrons. Now take those particles, they are made up of even smaller particles. Electrons, for example, are made up of Quarks. Quarks, in turn, are made up of even smaller particles (strings?). And , theoretically.. on down the line.. smaller and smaller... to what?
Now lets go the other way...
Atoms combine to make up molecules, which combine molecularly to form massive bodies themselves - planets and stars - which make up individual solar systems. These solar systems merge and combine and swirl to become galaxies. These galaxies and those that have been formed for millions/billions of years and those being formed currently on the outer edges of our "universe" *construct* our "universe".
So i have two questions to chew on.
1) Is it possible that our "universe" is on some insanely massive scale combining with other "universes" to form some other even more insanely massive conglomerate, which, in turn, would combine with similar conglomerates to form yet something even bigger.. and up on so on and so forth?
And the second question, which makes my head hurt even more.
2) Keep in mind that "matter" is comprised of mostly empty space. Everything else is these "particles". (with me so far? ..good) Now if these particles are made up of smaller particles... which in turn are comprised mostly of empty space and even smaller particles.... and those particles are comprised of mostly empty space and the even smal... well you see where im going with this i hope.. are we really made of nothing at all? Swirling, tugging, expanding, spinning masses of nothingness?
I'll even go on a slight tangent for the hell of it... because once i start with this shit i cant stop.. because my thoughts keep building on one another. If matter and energy are the same and interchangable (which they are) what exactly is energy? Matter can change into energy and energy can change into matter but how can we really define either if neither truly exist.
Dont even fucking get me started on anti-particles!