The Bullet Cluster

2022-09-27 - This is a composite image of the Bullet Cluster, a galaxy cluster made up of several smaller clusters of galaxies, about 3.4 billion light-years away from Earth. The image includes three important elements: visible light (stars and galaxies in white and orange) gathered by Hubble and the Magellan Telescope; pink areas where the Chandra X-ray Observatory detected hot gas, which contains most of the “normal” matter in the clusters; and blue areas, where astronomers find the most mass in the clusters. (Credit: NASA/CXC/M. Markevitch et al./STScI/Magellan/UArizona/D. Clowe et al./ESO WFI)