This implies we live in a universe "in which six of the space dimensions have been collapsed or curled up in themselves." (Tipler 650). Since all of these dimensions are believed to be of the order of the Planck length they cannot be seen by any common experimental procedures currently in practice today.

Despite the attractiveness of string theory its utilization of large numbers of space dimensions raises many important questions regarding the formation of the universe, and questions about the possibility of ever verifying it in the lab. Considering the fact that many aspects of physics depend upon the existence of only three spatial dimensions, this might suggest that "three" is a deep principle within nature. Somehow, physics might demand that three dimensions of space grow infinitely while the others collapse on themselves; then again, the creation of our universe may have been utterly accidental in its outcome.

Clearly,...
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