Hubble Discovers a Galaxy Made Almost Entirely of Dark Matter

Using the Hubble Space Telescope and other observatories, astronomers have confirmed CDG-2, a rare galaxy in the Perseus Cluster composed of roughly 99% dark matter. With almost no visible stars or gas, the object was identified by tracking its globular clusters — gravitational clues revealing a hidden structure.

Researchers suggest its star-forming material was stripped away by nearby galaxies. The discovery showcases advanced statistical methods and machine learning techniques that may soon reveal many more of these “ghost” galaxies.

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