Our universe is only visible in three directions, but theoretical physicists believe that other dimensions may exist outside the range of our perception, one of which is the fourth dimension. In addition to the dimensions that determine length, area, and volume, it is a theorized spatial dimension.

Researchers have attempted to explain time travel using the fourth dimension, but it still seems fictitious since we already know that we cannot see or perceive it. What good is knowing about the fourth dimension if we can’t use it to go through time and if we can’t even see it? Mathematicians and physicists value this knowledge because it aids in their understanding of the universe. For instance, string theory requires at least 10 dimensions to continue to exist [source: Groleau]. For these academics, the next dimension—and beyond—may hold the key to solving challenging issues in the 3-D world.

Although the fourth dimension is a challenging concept to grasp, this outstanding high school kid does a fantastic job of describing it.