This image of Abell 2744 is the first to come from Hubble's
Frontier Fields observing programme, which is using the magnifying power of
enormous galaxy clusters to peer deep into the distant Universe. Abell 2744,
nicknamed Pandora's Cluster, is thought to have a very violent history, having
formed from a cosmic pile-up of multiple galaxy clusters.
Astronomers previously observed Abell 2744 with the NASA/ESA
Hubble Space Telescope back in 2011, exploring the cluster's history. They
found that at least four galaxy clusters had crashed into one another to form
Abell 2744, causing some weird and wonderful effects. This mix of cosmic
phenomena, some of which had never been seen before, led to the nickname of
Pandora's Cluster (heic1111).