Hydra Cluster

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What Wikipedia says

The Hydra Cluster (or Abell 1060) is a galaxy cluster that contains 157 bright galaxies, appearing in the constellation Hydra. The cluster spans about ten million light-years and has an unusually high proportion of dark matter.

Excerpt from the Wikipedia article “Hydra Cluster”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Richard Powell, CC BY-SA 2.5, via Wikimedia Commons.