This composite image from the Hubble Space Telescope’s Advanced Camera for Surveys and its Wide Field Camera 3 shows a huge cluster of galaxies some six billion light years away known as PSZ23 G138.61-10.84. The image is from an observing programme called the Reionization Lensing Cluster Survey, or RELICS. The RELICS project has studied 41 galaxy clusters to help locate the brightest distant galaxies for follow-on observations by the James Webb Space Telescope, scheduled for launch in 2020.
The Hubble Space Telescope captures a deep view of stars in the Milky Way’s central bulge, helping astronomers understand a dynamic environment where stars rich in heavier elements orbit the core faster than older stars that are deficient in such elements. The image is part of two on-going surveys to learn more about the galaxy’s structure and evolution.