CDG-2: The Dark Galaxy Hidden in Perseus

CDG-2 is the first galaxy found not by starlight but by the glow of its accessories—globular clusters. A statistical search flagged a tight cluster of clusters in the Perseus cluster, and follow-up with Hubble, Subaru, and Euclid revealed a very faint, diffuse halo that anchors them gravitationally. The galaxy is about 99.9% dark matter, likely quenched long ago by ram-pressure stripping in a crowded environment. With Roman and Rubin on the horizon and AI-driven searches, astronomers expect to uncover thousands more such ghosts, reshaping our map of the universe.

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