The Suzaku X-Ray Space Observatory is providing new insight into how assemblages of thousands of galaxies pull themselves together. For the first time, Suzaku has detected X-ray emitting gas at a cluster's outskirts. By looking at a cluster in X-rays, astronomers can measure the temperature and density of the gas, which provides clues about the gas pressure and total mass of the cluster. Suzaku, which means "Red Bird of the South" was developed at the Japan Aerospace Exploration Agency (JAXA) in collaboration with NASA.