El Gordo (ACT-CL J0102-4915)
This is a Hubble image of the most massive cluster of galaxies ever seen to exist when the universe was just half its current age of 13.8 billion years. The cluster contains several hundred galaxies. The cluster was nicknamed El Gordo (Spanish for "the fat one") in 2012 when X-ray observations and kinematic studies first suggested it was unusually massive for the time in the early universe when it existed. The Hubble data have confirmed that the cluster is undergoing a violent merger between two smaller clusters.
Image Credit: NASA, ESA, and J. Jee (University of California, Davis)
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https://science.nasa.gov/image-detail/14-096-el-gordo/
Image CreditNASA, ESA, and J. Jee (University of California, Davis)
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