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.

This episode includes AI-generated content.