According to the Randall-Sundrum theory of the universe, "'Braneworld," the perceivable universe - that which we can observe physically - is a "membrane within a larger universe, like a strand of seaweed floating in the ocean." As such, it may be five dimensional, as opposed to the four dimensional  Einsteinian universe (height, width, depth and time).

So...where's the proof?

Possibly in the existence of "miniature black holes" that may be  floating around our solar system (a potentially frightening thought, if you've kept up with the posts on this particular blog). A new outer space telescope -  the Gamma-ray Large Space Telescope (GLAST) - is scheduled for launch next year that is sensitive enough to detect these mini-black holes - assuming they exist. If they do, scientists will be able to test the "'Braneworld" Theory, which one scientist described as "crazy enough to be true."

These "mini-black holes," thought to be the size of an atom's nucleus - but weighing as much as a small asteroid - are remnants of the "Big Bang," according to Braneworld, and there may be billions of them seeded throughout the galaxy. Relativity, on the other hand, suggests that these objects have long since evaporated. If these mini-black holes indeed exist, they would warp the fabric of space in a way different from that of "normal" black holes. According to scientists, light waves - particularly gamma rays - will be distorted in a different way when passing them.

If this indeed is true, GLAST will tell us all about it.