X-ray and Optical Image of Bullet Cluster (IMAGE) Chandra X-ray Center Caption This view of the Bullet Cluster is a combination of X-rays from Chandra (red) and optical data from the Hubble and Magellan telescopes (yellow). Scientists have examined this system with Chandra and Compton to look for evidence of antimatter that may be found in X-ray and gamma ray emission. The results did not reveal the signature for antimatter, meaning that if it is there, antimatter is less than 3 parts per million in this system. Credit X-ray: NASA/CXC/CfA/M.Markevitch et al. Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al. Usage Restrictions None License Licensed 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.