Dark matter in galaxies

Dark matter in the high-redshift cluster CL 0152-1357.
Gravitational lensing analysis with the Advanced Camera for Surveys (ACS) reveals the complicated dark matter distribution (purple) in unprecedented detail when the universe was at half its present age. The yellowish galaxies are the visible cluster member galaxies forming a filamentary structure, possibly in the process of merging (Jee et al. 2005 Astrophysical Journal)

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