Bullet Cluster

Two colliding clusters of galaxies in constellation Carina

Bullet Cluster

The Bullet Cluster (1E 0657-56) consists of two colliding clusters of galaxies. Strictly speaking, the name Bullet Cluster refers to the smaller subcluster, moving away from the larger one. It is at a comoving radial distance of 1.141 Gpc (3.72 billion light-years).

From Wikipedia, under CC BY-SA. More on occurri.