This image combines visible light exposures of galaxy cluster Abell 2744 taken by the NASA/ESA Hubble Space Telescope and the European Southern Observatory’s Very Large Telescope, with X-ray data from NASA’s Chandra X-ray Observatory and a mathematical reconstruction of the location of dark matter. NASA/ESA/ESO/CXC/D. Coe (STScI)/J. Merten (Heidelberg/Bologna)