Abell 520, also known as the "Train Wreck Cluster," is a galaxy cluster located in the constellation of Pegasus. It was first cataloged in the Abell catalog of rich galaxy clusters. What makes Abell 520 particularly interesting is its complex structure and the evidence of multiple merging galaxy clusters within it. The nickname "Train Wreck Cluster" originates from the unusual arrangement of galaxies and their dark matter distribution, which suggests that it may be the result of a collision between several clusters.
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