Dark matter and dark energy comprise 96 percent of the universe, or so says the "standard" theory; but where (and what) are dark matter and dark energy? Scientists call them "dark" because their presence has to be deduced from gravitational data about the visible universe, which indicates the presence of 74 percent more energy, and 22 percent more matter, than we see through our telescopes. Just this year, however, newly proposed theories have offered new explanations of dark energy and dark matter. Dark energy, for instance, was recently explained as the quantum "pressure" of empty space and dark matter as located in a halo around the galaxies. Now, researchers at the University of Utah (Salt Lake City) have an explanation for how dark matter, powered by weakly interacting massive particles (WIMPs), enabled the creation of vast dark stars.