Credit: X-ray: NASA/CXC/SAO/G.Schellenberger et al.; Optical: SDSS A mega-merger of four galaxy clusters in Abell 1758 has been observed by Chandra and other telescopes. Abell 1758 contains two pairs of galaxy clusters, each with hundreds of galaxies embedded in large amounts of hot gas and unseen dark matter. Eventually, these two pairs of clusters will…
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