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Galaxy cluster Abell 2744 is nicknamed Pandora's Cluster because so many different and strange phenomena have been unleashed by a huge collision that occurred over a period of 350 million years. A simultaneous pile-up between at least four separate clusters produced strange effects that have never been seen together before.

CREDIT: ESO & D. Coe (STScI)/J. Merten (Heidelberg/Bologna).

Source:
http://www.eso.org/public/images/eso1120b/