E-Mail IMAGE: On the left is a simulated image in which intracluster light is visible as a diffuse haze between discrete peaks of brightness -- the galaxies. In observations, as seen in... view more Credit: Left image: Jesse Golden-Marx; simulation by The IllustrisTNG. Right image: Dark Energy Survey and Yuanyuan Zhang A combination of observational data and sophisticated computer simulations have yielded advances in a field of astrophysics that has languished for half a century. The Dark Energy Survey, which is hosted by the U.S. Department of Energy's Fermi National Accelerator Laboratory, has published a burst of new results on what's called intracluster light, or ICL, a faint type of light found inside galaxy clusters.