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The Phoenix Cluster, shown here in an image comprising microwave (orange), visible (red, green, blue) and ultraviolet (blue) light, is the most fertile galaxy cluster observed so far, birthing more than 700 stars per year. The Phoenix cluster hosts roughly 1,000 galaxies. Credit: UV: NASA, JPL-Caltech, M. McDonald; Optical: AURA, NOAO, CTIO, MIT, M. McDonald; Microwave: NSF/SPT

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