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Hubble's image of Galaxy cluster Abell 1689. This cluster is situated two thousand million light-years away, and is one of the most massive objects in the Universe. Abell 1689 was also imaged by ESA's XMM-Newton.
NASA, N. Benitez (JHU), T. Broadhurst (Racah Institute of Physics/The Hebrew University), H. Ford (JHU), M. Clampin (STScI), G. Hartig (STScI), G. Illingworth (UCO/Lick Observatory), the ACS Science Team and ESA