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tu cielo.

The Matter of the Bullet Cluster

The Bullet Cluster, 1E 0657-56, is 3.4 billion light-years away. This composite image shows its matter distribution. Optical data reveals individual galaxies, but their total mass is less than the hot X-ray emitting gas clouds, shown in red. Even more mass, shown in blue, represents the distribution of dark matter. This cluster provides strong evidence for dark matter's existence.