A composite X-ray/optical image of the galaxy cluster 1E 0657-56, also known as the “Bullet Cluster.” This cluster was formed following the collision of two large clusters of galaxies. The X-ray image, pink, is from the Chandra X-Ray Observatory. The optical image is from the Magellan telescope and the Hubble Space Telescope; the galaxies are orange and white. The distribution of mass as determined by gravitational lens analysis is blue.
