Galaxy map reveals the limits of cosmic structure
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