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ENLIGHTENING PUZZLES
View Larger Version | Arp 274 is a trio of galaxies, the two largest of which appear about to merge in this image, with the third much smaller galaxy on the far left. Scientists want to figure out how galaxies and large groups of galaxies, called clusters, evolve. Credit: NASA, ESA, M. Livio and the Hubble Heritage Team (STSCI/AURA)

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