Universe Supercomputer Simulation (IMAGE) University of Colorado at Boulder Caption Pictured is a portion of a supercomputer simulation of the universe showing a region roughly 1.5 billion light-years on a side. The bright object in the center is a galaxy cluster about 1 million-billion times the mass of the sun. In between the filaments, which store most of the universe's mass, are giant, spherical voids nearly empty of matter. Credit University of Colorado at Boulder Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.