Galaxy cluster (IMAGE) University of Washington Caption Image of Abell 2218, a dense galactic cluster approximately 2 billion light years from Earth. Image URL: https://esahubble.org/images/heic0814a/ Credit NASA/ESA/Johan Richard Usage Restrictions Must include credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.