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Big, Bigger . . . Biggest?

Galaxy map reveals the limits of cosmic structure

2:31pm, April 15, 2003

Stars congregate in galaxies, galaxies in clusters, and clusters in gargantuan assemblages called superclusters. This cosmic hierarchy prompts a question that astronomers have pondered for nearly 2 decades: Have we already discerned the largest structures in the universe, or are there greater things to come?

A new map of the heavens—the largest galaxy survey to date—reveals that superclusters are indeed the biggest objects in the universe. In

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