posted on Aug, 30 2003 @ 12:55 PM
According to almost all scientific data available, the universe is extremely large, but still finite. Many theories state that in a finite universe
such as ours, it is a 4 dimensional version of a 3 dimensional balloon.
Consider the time shortly after the big bang as a deflated balloon. Draw some dots on the surface of the balloon representing stars. Now blow up the
balloon... as this "universe" expands the stars grow farther and farther apart. The balloon's surface is a finite, expanding volume. Now if one of
those dots, or stars, is our own sun and we head for a distant star it will feel as if we are going in a straight line, when in actuality we are
traveling along the curved surface of the balloon. It only feels like a straight line because we can't really sense this curvature. Now if we keep
heading in a straight line... towards the "end" of the universe we will find that we end up right back where we started. The universe is closed back
upon itself, so as we travel in a straight line we are really just travelling along the curvature. There is essentially no "boundary" that we can
hit in a 3 dimensional sense.