String theory, among other lesser known theories, states that extra dimensions must exist. Proving that has always been a problem. However, in a paper recently published by a group of physicists from the University of Wisconsin, the problem might be solved as we get better views of cosmic radiation left over from the big bang. They believe that in the future, as we get images from projects such as the ESA's Planck satellite, we should be able to see the influences of other dimensions on the early cosmos on the radiation background, in effect proving their existence.