The investigation of real and simulated galactic clusters supports the lambda cold dark matter model of cosmology.
, with free electrons no longer infinitely scattering photons. This allowed the universe to become transparent to light.
, which models galaxy clusters and their environments, assessing what shape the X-ray emission for each cluster should take. To refine their data set, the researchers applied selection criteria that allowed them to identify relaxed clusters in real observations of the universe. Then, they could assess the relationship among the cluster mass, how centrally concentrated this mass was, and the
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