Overview
- The object, designated CDG-2, lies in the Perseus cluster about 300 million light-years from Earth.
- Astronomers first identified a tight grouping of four globular clusters, then deep imaging revealed faint diffuse starlight consistent with a bound galaxy.
- Early estimates point to an extreme dark-matter fraction near 99%, based on the system’s minimal stellar light.
- CDG-2 shines with roughly the light of six million suns, with its four clusters contributing about 16% of that visible emission.
- The team suggests most ordinary matter was likely stripped by environmental interactions in Perseus, and they call for spectroscopic and kinematic follow-up to confirm mass and dynamics.